Climate warming is expected to destabilize permafrost carbon (PF\uffe2\uff80\uff90C) by thaw\uffe2\uff80\uff90erosion and deepening of the seasonally thawed active layer and thereby promote PF\uffe2\uff80\uff90C mineralization to CO2 and CH4. A similar PF\uffe2\uff80\uff90C remobilization might have contributed to the increase in atmospheric CO2 during deglacial warming after the last glacial maximum. Using carbon isotopes and terrestrial biomarkers (\uffce\uff9414C, \uffce\uffb413C, and lignin phenols), this study quantifies deposition of terrestrial carbon originating from permafrost in sediments from the Chukchi Sea (core SWERUS\uffe2\uff80\uff90L2\uffe2\uff80\uff904\uffe2\uff80\uff90PC1). The sediment core reconstructs remobilization of permafrost carbon during the late Aller\uffc3\uffb8d warm period starting at 13,000\uffc2\uffa0cal\uffc2\uffa0years before present (BP), the Younger Dryas, and the early Holocene warming until 11,000\uffc2\uffa0cal\uffc2\uffa0years BP and compares this period with the late Holocene, from 3,650\uffc2\uffa0years BP until present. Dual\uffe2\uff80\uff90carbon\uffe2\uff80\uff90isotope\uffe2\uff80\uff90based source apportionment demonstrates that Ice Complex Deposit\uffe2\uff80\uff94ice\uffe2\uff80\uff90 and carbon\uffe2\uff80\uff90rich permafrost from the late Pleistocene (also referred to as Yedoma)\uffe2\uff80\uff94was the dominant source of organic carbon (66\uffc2\uffa0\uffc2\uffb1\uffc2\uffa08%; mean\uffc2\uffa0\uffc2\uffb1\uffc2\uffa0standard deviation) to sediments during the end of the deglaciation, with fluxes more than twice as high (8.0\uffc2\uffa0\uffc2\uffb1\uffc2\uffa04.6\uffc2\uffa0g\uffc2\uffb7m\uffe2\uff88\uff922\uffc2\uffb7year\uffe2\uff88\uff921) as in the late Holocene (3.1\uffc2\uffa0\uffc2\uffb1\uffc2\uffa01.0\uffc2\uffa0g\uffc2\uffb7m\uffe2\uff88\uff922\uffc2\uffb7year\uffe2\uff88\uff921). These results are consistent with late deglacial PF\uffe2\uff80\uff90C remobilization observed in a Laptev Sea record, yet in contrast with PF\uffe2\uff80\uff90C sources, which at that location were dominated by active layer material from the Lena River watershed. Release of dormant PF\uffe2\uff80\uff90C from erosion of coastal permafrost during the end of the last deglaciation indicates vulnerability of Ice Complex Deposit in response to future warming and sea level changes.Investigating active participants in the fixation of dinitrogen gas is vital as N is often a limiting factor for primary production. Biological nitrogen fixation is performed by a diverse guild of bacteria and archaea (diazotrophs), which can be free\uffe2\uff80\uff90living or symbionts. Free\uffe2\uff80\uff90living diazotrophs are widely distributed in the environment, yet our knowledge about their identity and ecophysiology is still limited. A major challenge in investigating this guild is inferring activity from genetic data as this process is highly regulated. To address this challenge, we evaluated and improved several 15N\uffe2\uff80\uff90based methods for detecting N2 fixation activity (with a focus on soil samples) and studying active diazotrophs. We compared the acetylene reduction assay and the 15N2 tracer method and demonstrated that the latter is more sensitive in samples with low activity. Additionally, tracing 15N into microbial RNA provides much higher sensitivity compared to bulk soil analysis. Active soil diazotrophs were identified with a 15N\uffe2\uff80\uff90RNA\uffe2\uff80\uff90SIP approach optimized for environmental samples and benchmarked to 15N\uffe2\uff80\uff90DNA\uffe2\uff80\uff90SIP. Lastly, we investigated the feasibility of using SIP\uffe2\uff80\uff90Raman microspectroscopy for detecting 15N\uffe2\uff80\uff90labelled cells. Taken together, these tools allow identifying and investigating active free\uffe2\uff80\uff90living diazotrophs in a highly sensitive manner in diverse environments, from bulk to the single\uffe2\uff80\uff90cell level.
", "keywords": ["Spectrum Analysis", " Raman", "BIOLOGICAL SOIL CRUSTS", "106005 Bioinformatik", "106023 Molekularbiologie", "Nitrogen Fixation", "REVEALS", "FLUORESCENCE", "Research Articles", "Soil Microbiology", "106022 Mikrobiologie", "SPECTROSCOPY", "Bacteria", "Nitrogen Isotopes", "106003 Biodiversity research", "106023 Molecular biology", "GENETIC-REGULATION", "Archaea", "6. Clean water", "SURFACE-ENHANCED RAMAN", "COMMUNITY", "106003 Biodiversit\u00e4tsforschung", "13. Climate action", "Isotope Labeling", "106022 Microbiology", "NITROGEN-FIXATION", "106005 Bioinformatics", "RIBOSOMAL-RNA", "N-2 FIXATION"]}, "links": [{"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1111/1462-2920.13954"}, {"href": "https://doi.org/10.1111/1462-2920.13954"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Microbiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/1462-2920.13954", "name": "item", "description": "10.1111/1462-2920.13954", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/1462-2920.13954"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-12-15T00:00:00Z"}}, {"id": "10.1016/j.scitotenv.2018.11.010", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-27T16:18:15Z", "type": "Journal Article", "created": "2018-11-03", "title": "\u03b415N of lichens reflects the isotopic signature of ammonia source", "description": "Although it is generally accepted that \u03b415N in lichen reflects predominating N isotope sources in the environment, confirmation of the direct correlation between lichen \u03b415N and atmospheric \u03b415N is still missing, especially under field conditions with most confounding factors controlled. To fill this gap and investigate the response of lichens with different tolerance to atmospheric N deposition, thalli of the sensitive Evernia prunastri and the tolerant Xanthoria parietina were exposed for ten weeks to different forms and doses of N in a field manipulation experiment where confounding factors were minimized. During this period, several parameters, namely total N, \u03b415N and chlorophyll a fluorescence, were measured. Under the experimental conditions, \u03b415N in lichens quantitatively responded to the \u03b415N of released gaseous ammonia (NH3). Although a high correlation between the isotopic signatures in lichen tissue and supplied N was found both in tolerant and sensitive species, chlorophyll a fluorescence indicated that the sensitive species very soon lost its photosynthetic functionality with increasing N availability. The most damaging response to the different N chemical forms was observed with dry deposition of NH3, although wet deposition of ammonium ions had a significant observable physiological impact. Conversely, there was no significant effect of nitrate ions on chlorophyll a fluorescence, implying differential sensitivity to dry deposition versus wet deposition and to ammonium versus nitrate in wet deposition. Evernia prunastri was most sensitive to NH3, then NH4+, with lowest sensitivity to NO3-. Moreover, these results confirm that lichen \u03b415N can be used to indicate the \u03b415N of atmospheric ammonia, providing a suitable tool for the interpretation of the spatial distribution of NH3 sources in relation to their \u03b415N signal.", "keywords": ["Air Pollutants", "Nitrates", "Lichens", "Nitrogen Isotopes", "Chlorophyll A", "0211 other engineering and technologies", "02 engineering and technology", "Models", " Theoretical", "chlorophyll a fluorescence", "01 natural sciences", "nitrogen deposition", "Xanthoria parietina", "Species Specificity", "Ammonia", "13. Climate action", "source spatial distribution", "biomonitoring", "physiological response", "Photosynthesis", "Environmental Monitoring", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.scitotenv.2018.11.010"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20of%20The%20Total%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.scitotenv.2018.11.010", "name": "item", "description": "10.1016/j.scitotenv.2018.11.010", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.scitotenv.2018.11.010"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-02-01T00:00:00Z"}}, {"id": "10.1029/2019jd030387", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:15Z", "type": "Journal Article", "created": "2019-06-19", "title": "Global 3-D Simulations of the Triple Oxygen Isotope Signature \u0394 17 O in Atmospheric CO 2", "description": "AbstractThe triple oxygen isotope signature \uffce\uff9417O in atmospheric CO2, also known as its \uffe2\uff80\uff9c17O excess,\uffe2\uff80\uff9d has been proposed as a tracer for gross primary production (the gross uptake of CO2 by vegetation through photosynthesis). We present the first global 3\uffe2\uff80\uff90D model simulations for \uffce\uff9417O in atmospheric CO2 together with a detailed model description and sensitivity analyses. In our 3\uffe2\uff80\uff90D model framework we include the stratospheric source of \uffce\uff9417O in CO2 and the surface sinks from vegetation, soils, ocean, biomass burning, and fossil fuel combustion. The effect of oxidation of atmospheric CO on \uffce\uff9417O in CO2 is also included in our model. We estimate that the global mean \uffce\uff9417O (defined as with \uffce\uffbbRL = 0.5229) of CO2 in the lowest 500\uffc2\uffa0m of the atmosphere is 39.6\uffc2\uffa0per meg, which is \uffe2\uff88\uffbc20\uffc2\uffa0per meg lower than estimates from existing box models. We compare our model results with a measured stratospheric \uffce\uff9417O in CO2 profile from Sodankyl\uffc3\uffa4 (Finland), which shows good agreement. In addition, we compare our model results with tropospheric measurements of \uffce\uff9417O in CO2 from G\uffc3\uffb6ttingen (Germany) and Taipei (Taiwan), which shows some agreement but we also find substantial discrepancies that are subsequently discussed. Finally, we show model results for Zotino (Russia), Mauna Loa (United States), Manaus (Brazil), and South Pole, which we propose as possible locations for future measurements of \uffce\uff9417O in tropospheric CO2 that can help to further increase our understanding of the global budget of \uffce\uff9417O in atmospheric CO2.
", "keywords": ["CARBONIC-ANHYDRASE ACTIVITY", "550", "STRATOSPHERIC CO2", "STOMATAL CONDUCTANCE", "TRACER", "stable isotopes", "MASS", "carbon dioxide (CO)", "01 natural sciences", "7. Clean energy", "DIOXIDE EXCHANGE", "O excess (\u0394O)", "3-DIMENSIONAL SYNTHESIS", "carbon dioxide (CO2)", "carbon cycle", "O-17 excess (Delta O-17)", "SDG 13 - Climate Action", "SDG 14 - Life Below Water", "Research Articles", "0105 earth and related environmental sciences", "O-18 CONTENT", "info:eu-repo/classification/ddc/550", "mass-independent fractionation (MIF)", "ddc:550", "gross primary production (GPP)", "15. Life on land", "Earth sciences", "13. Climate action", "MODEL TM5", "17O excess (\u039417O)", "FIRE EMISSIONS"]}, "links": [{"href": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JD030387"}, {"href": "https://doi.org/10.1029/2019jd030387"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Geophysical%20Research%3A%20Atmospheres", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1029/2019jd030387", "name": "item", "description": "10.1029/2019jd030387", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1029/2019jd030387"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-08-04T00:00:00Z"}}, {"id": "10.1016/j.quascirev.2019.106130", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:18:09Z", "type": "Journal Article", "created": "2020-01-06", "title": "Latest Pleistocene to Holocene loess in the central Great Plains: Optically stimulated luminescence dating and multi-proxy analysis of the enders loess section (Nebraska, USA)", "description": "Loess deposits of the central Great Plains, USA, and their intercalated soils provide a detailed record of climatically driven changes within the aeolian system during the Pleistocene-Holocene transition and the Holocene. Here we present a detailed optically stimulated luminescence (OSL) chronology as well as multi-proxy analysis obtained for the first time on the Enders section, located in southwestern Nebraska, central Great Plains. The section records multiple episodes of rapid loess deposition alternating with soil formation. Rapid accumulation of Late Pleistocene Peoria Loess was replaced around 13-14 ka by formation of the Brady Soil until 9.5 \u00b1 0.6 ka. The Holocene Bignell Loess then buried the Brady Soil and accumulated episodically throughout the Holocene. The loess-paleosol stratigraphy since the Late Pleistocene at the Enders site is very similar to that at other sites in western Nebraska, and the newly developed OSL chronology (based on three grain size classes) adds new confidence to earlier dating. The high-resolution grain size profile from Enders shares many features with similar data from the previously studied Wauneta site, including three peaks of fine-grained material just above and within the Brady Soil, likely representing response to millennial-scale climatic changes during the Pleistocene-Holocene transition. This study demonstrates the potential for developing high-resolution, well-dated paleoclimatic records from the loess of the central Great Plains. Contrasts between Great Plains and Eurasian loess records reflect differences in the Late Pleistocene to Holocene climatic evolution and other factors influencing the loess system.", "keywords": ["15. Life on land", "01 natural sciences", "Holocene; loess; optically stimulated luminescence dating; grain size; magnetic susceptibility; stable isotopes; Brady Soil", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.quascirev.2019.106130"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Quaternary%20Science%20Reviews", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.quascirev.2019.106130", "name": "item", "description": "10.1016/j.quascirev.2019.106130", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.quascirev.2019.106130"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-02-01T00:00:00Z"}}, {"id": "10.1029/2019jg005511", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:15Z", "type": "Journal Article", "created": "2020-01-29", "title": "Particulate Organic Matter Dynamics in a Permafrost Headwater Stream and the Kolyma River Mainstem", "description": "AbstractOngoing rapid arctic warming leads to extensive permafrost thaw, which in turn increases the hydrologic connectivity of the landscape by opening up subsurface flow paths. Suspended particulate organic matter (POM) has proven useful to trace permafrost thaw signals in arctic rivers, which may experience higher organic matter loads in the future due to expansion and increasing intensity of thaw processes such as thermokarst and river bank erosion. Here we focus on the Kolyma River watershed in Northeast Siberia, the world's largest watershed entirely underlain by continuous permafrost. To evaluate and characterize the present\uffe2\uff80\uff90day fluvial release of POM from permafrost thaw, we collected water samples every 4\uffe2\uff80\uff937 days during the 4\uffe2\uff80\uff90month open water season in 2013 and 2015 from the lower Kolyma River mainstem and from a small nearby headwater stream (Y3) draining an area completely underlain by Yedoma permafrost (Pleistocene ice\uffe2\uff80\uff90 and organic\uffe2\uff80\uff90rich deposits). Concentrations of particulate organic carbon generally followed the hydrograph with the highest concentrations during the spring flood in late May/early June. For the Kolyma River, concentrations of dissolved organic carbon showed a similar behavior, in contrast to the headwater stream, where dissolved organic carbon values were generally higher and particulate organic carbon concentrations lower than for Kolyma. Carbon isotope analysis (\uffce\uffb413C, \uffce\uff9414C) suggested Kolyma\uffe2\uff80\uff90POM to stem from both contemporary and older permafrost sources, while Y3\uffe2\uff80\uff90POM was more strongly influenced by in\uffe2\uff80\uff90stream production and recent vegetation. Lipid biomarker concentrations (high\uffe2\uff80\uff90molecular\uffe2\uff80\uff90weight n\uffe2\uff80\uff90alkanoic acids and n\uffe2\uff80\uff90alkanes) did not display clear seasonal patterns, yet implied Y3\uffe2\uff80\uff90POM to be more degraded than Kolyma\uffe2\uff80\uff90POM.
", "keywords": ["particulate organic carbon", "15. Life on land", "01 natural sciences", "6. Clean water", "particulate organic carbon; permafrost; Kolyma; carbon isotopes; lipid biomarkers; Arctic", "Kolyma", "Arctic", "carbon isotopes", "13. Climate action", "SDG 13 - Climate Action", "lipid biomarkers", "Research Articles", "permafrost", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JG005511"}, {"href": "https://doi.org/10.1029/2019jg005511"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Geophysical%20Research%3A%20Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1029/2019jg005511", "name": "item", "description": "10.1029/2019jg005511", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1029/2019jg005511"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-02-01T00:00:00Z"}}, {"id": "10.1016/j.scitotenv.2004.12.066", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-06-27T16:18:11Z", "type": "Journal Article", "created": "2005-03-11", "title": "Assessment Of Lead Availability In Contaminated Soil Using Isotope Dilution Techniques", "description": "Isotope dilution methods using a stable isotope tracer ((207)Pb) were developed for the determination of Pb availability in contaminated soils. The methods included determination of E values (isotopically exchangeable pool), L values (plant labile pool) and isotopic exchange kinetics (IEK). Isotopically exchangeable Pb was monitored at different exchange times based on measurement of the (207)Pb/(208)Pb ratio in soil solution following addition of the tracer. The rate of decrease in the (207)Pb/(208)Pb ratio in solution could be described by using the same IEK equation as used previously with radioisotope tracers. The amounts of isotopically exchangeable Pb in Pb-contaminated soils estimated from long-term IEK parameters were in good agreement with directly determined E values up to 15 days. However, values of some of the fitted IEK parameters cast doubts on the validity of using the IEK approach with (207)Pb, most probably as a result of irreversible fixation of some of the spike by reactive surfaces in the soils. Estimation of isotopically exchangeable Pb using short-term kinetics data was unsuccessful, substantially underestimating E values. Results for the control (uncontaminated) soil were highly variable, most probably as a result of fixation of tracer by the soil and poor analytical precision due to low solution Pb concentrations. A compartmental analysis of the variation in E values with time indicates a good potential for estimating bioavailable Pb in contaminated soils. The amounts of available Pb obtained from summation of the E(1)(min) and E(1 min-24 h) pools (E((available))), accounting for an average of 57.62% of total soil Pb, were significantly correlated with both the L values and with Pb extracted from soil with EDTA.", "keywords": ["Isotopes", "Lead", "Indicator Dilution Techniques", "Soil Pollutants", "01 natural sciences", "Edetic Acid", "6. Clean water", "Chelating Agents", "Environmental Monitoring", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.scitotenv.2004.12.066"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20of%20The%20Total%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.scitotenv.2004.12.066", "name": "item", "description": "10.1016/j.scitotenv.2004.12.066", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.scitotenv.2004.12.066"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-09-01T00:00:00Z"}}, {"id": "10.1016/j.scitotenv.2013.03.090", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:18:12Z", "type": "Journal Article", "created": "2013-04-24", "title": "Microbial Utilisation Of Biochar-Derived Carbon", "description": "Whilst largely considered an inert material, biochar has been documented to contain a small yet significant fraction of microbially available labile organic carbon (C). Biochar addition to soil has also been reported to alter soil microbial community structure, and to both stimulate and retard the decomposition of native soil organic matter (SOM). We conducted a short-term incubation experiment using two (13)C-labelled biochars produced from wheat or eucalypt shoots, which were incorporated in an aridic arenosol to examine the fate of the labile fraction of biochar-C through the microbial community. This was achieved using compound specific isotopic analysis (CSIA) of phospholipid fatty acids (PLFAs). A proportion of the biologically-available fraction of both biochars was rapidly (within three days) utilised by gram positive bacteria. There was a sharp peak in CO2 evolution shortly after biochar addition, resulting from rapid turnover of labile C components in biochars and through positive priming of native SOM. Our results demonstrate that this CO2 evolution was at least partially microbially mediated, and that biochar application to soil can cause significant and rapid changes in the soil microbial community; likely due to addition of labile C and increases in soil pH.", "keywords": ["Carbon sequestration", "[SDE] Environmental Sciences", "Carbon Sequestration", "Chromatography", " Gas", "Magnetic Resonance Spectroscopy", "550", "short term", "[SDV]Life Sciences [q-bio]", "growth", "black carbon", "Char", "01 natural sciences", "630", "Mass Spectrometry", "c 13 plfa", "Black carbon", "soil organic matter", "Soil Pollutants", "mineralization", "Organic carbon", "Phospholipids", "Soil Microbiology", "char", "0105 earth and related environmental sciences", "2. Zero hunger", "Carbon Isotopes", "decomposition", "wheat straw", "biomass", "organic carbon", "Fatty Acids", "Western Australia", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "540", "pyrolysis", "forest soil", "carbon sequestration", "Carbon", "[SDV] Life Sciences [q-bio]", "Charcoal", "[SDE]Environmental Sciences", "0401 agriculture", " forestry", " and fisheries", "community structure", "\u00b9\u00b3C-PLFA", "Pyrolysis"]}, "links": [{"href": "https://doi.org/10.1016/j.scitotenv.2013.03.090"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20of%20The%20Total%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.scitotenv.2013.03.090", "name": "item", "description": "10.1016/j.scitotenv.2013.03.090", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.scitotenv.2013.03.090"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-11-01T00:00:00Z"}}, {"id": "10.1016/j.scitotenv.2015.12.107", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-06-27T16:18:13Z", "type": "Journal Article", "created": "2016-01-09", "title": "Partitioning Of Carbon Sources Among Functional Pools To Investigate Short-Term Priming Effects Of Biochar In Soil: A C-13 Study", "description": "Biochar sequesters carbon (C) in soils because of its prolonged residence time, ranging from several years to millennia. In addition, biochar can promote indirect C-sequestration by increasing crop yield while, potentially, reducing C-mineralization. This laboratory study was set up to evaluate effects of biochar on C-mineralization with due attention to source appointment by using (13)C isotope signatures. An arable soil (S) (7.9 g organic C, OC kg(-1)) was amended (single dose of 10 g kg(-1) soil) with dried, grinded maize stover (leaves and stalks), either natural (R) or (13)C enriched (R*), and/or biochar (B/B*) prepared from the maize stover residues (450 \u00b0C). Accordingly, seven different combinations were set up (S, SR, SB, SR*, SB*, SRB*, SR*B) to trace the source of C in CO2 (180 days), dissolved organic-C (115 days) and OC in soil aggregate fractions (90 days). The application of biochar to soil reduced the mineralization of native soil organic C but the effect on maize stover-C mineralization was not consistent. Biochar application decreased the mineralization of the non-enriched maize stover after 90 days, this being consistent with a significant reduction of dissolved organic C concentration from 45 to 18 mg L(-1). However, no significant effect was observed for the enriched maize stover, presumably due to differences between the natural and enriched materials. The combined addition of biochar and enriched maize stover significantly increased (twofold) the presence of native soil organic C or maize derived C in the free microaggregate fraction relative to soil added only with stover. Although consistent effects among C sources and biochar materials remains elusive, our outcomes indicate that some biochar products can reduce mineralization and solubilization of other sources of C while promoting their physical protection in soil particles.", "keywords": ["2. Zero hunger", "550", "Soil organic carbon", "Stable Isotopes", "04 agricultural and veterinary sciences", "15. Life on land", "630", "6. Clean water", "2311 Waste Management and Disposal", "Biochar", "2305 Environmental Engineering", "Priming", "2304 Environmental Chemistry", "2310 Pollution", "0401 agriculture", " forestry", " and fisheries", "Soil aggregates"]}, "links": [{"href": "https://doi.org/10.1016/j.scitotenv.2015.12.107"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20of%20The%20Total%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.scitotenv.2015.12.107", "name": "item", "description": "10.1016/j.scitotenv.2015.12.107", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.scitotenv.2015.12.107"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-03-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2023.109121", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:18:33Z", "type": "Journal Article", "created": "2023-07-04", "title": "When dry soil is re-wet, trehalose is respired instead of supporting microbial growth", "description": "When dry soil is re-wet there is a rapid increase in CO2 efflux and rates can remain above those of well-watered controls for one or more days. These large pulses of CO2 efflux are known as the `Birch effect. To provide experimental evidence of different pools of C fuelling the Birch effect, we incubated a drying soil with 13C6glucose, re wet the soil and quantified 13C labelling of pools (microbial biomass, trehalose, extracellular, and old C) and soil CO2 efflux. We took advantage of trehalose being the most 13C-enriched pool (& delta;13C = +518%o) to obtain direct isotopic evidence of trehalose's contribution to respiration and microbial growth. For soil incubated with 13C6-glucose, the & delta;13C of soil respiration was +35%o in dry soil, increased to 100%o in the 10 min following rewetting, and subsequently decreased. During the first 5 h after re-wetting, trehalose must have been contributing to respiration given that & delta;13C of soil respiration was more 13C enriched than trehalose-free microbial biomass (& delta;13C = +30%o), extracellular C (& delta;13C = -17.7%o), and old C (& delta;13C = -22.9%o). A four-member isotopic mixing model suggested trehalose underpinned 16% of respiration in the 1st hour after rewetting, decreasing to 7% in the fifth hour. At times beyond 5 h after rewetting, trehalose underpinned 0-4% of respiration. In the seven days following rewetting, microbial biomass increased 2292 nmol C g-1. Isotopic mass balance indicated trehalose-C could account for no more than 5% of the gross influx of C into microbial biomass, instead the increase in microbial biomass was fuelled by unlabelled or weakly labelled pools such as old C and extracellular C. Collectively these data provide direct experimental evidence C from trehalose does not significantly contribute to microbial growth in re-wet soil, but instead contributes to respiration for the first 5 h after rewetting.", "keywords": ["2. Zero hunger", "Ekologi", "Mass spectrometry", "Ecology", "Isotope", "Osmolyte", "Trehalose", "Jordbruk", " skogsbruk och fiske", "Birch effect", "Soil respiration", "Agriculture", " Forestry and Fisheries", "6. Clean water"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2023.109121"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2023.109121", "name": "item", "description": "10.1016/j.soilbio.2023.109121", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2023.109121"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-09-01T00:00:00Z"}}, {"id": "10.1021/acs.est.2c03925", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-27T16:18:59Z", "type": "Journal Article", "created": "2022-08-23", "title": "Coexisting Goethite Promotes Fe(II)-Catalyzed Transformation of Ferrihydrite to Goethite", "description": "Open AccessISSN:0013-936X", "keywords": ["Minerals", "template-directed nucleation", "Fe(II)\u2212Fe(III) electron transfer", "recrystallization", "Water", "electron hopping", "Ferric Compounds", "01 natural sciences", "Catalysis", "Soil", "Isotopes", "13. Climate action", "Ferrous Compounds", "labile Fe(III)", "Oxidation-Reduction", "Iron Compounds", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://pubs.acs.org/doi/pdf/10.1021/acs.est.2c03925"}, {"href": "https://doi.org/10.1021/acs.est.2c03925"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Science%20%26amp%3B%20Technology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1021/acs.est.2c03925", "name": "item", "description": "10.1021/acs.est.2c03925", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1021/acs.est.2c03925"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-08-23T00:00:00Z"}}, {"id": "10.1021/acs.est.4c01519", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-27T16:18:59Z", "type": "Journal Article", "created": "2024-06-04", "title": "Iron Oxyhydroxide Transformation in a Flooded Rice Paddy Field and the Effect of Adsorbed Phosphate", "description": "Open AccessISSN:0013-936X", "keywords": ["2. Zero hunger", "Minerals", "Iron", "iron reduction", "Oryza", "15. Life on land", "Ferric Compounds", "ferrihydrite", "6. Clean water", "Phosphates", "Mossbauer", "Soil", "Spectroscopy", " Mossbauer", "Fe(II)-catalyzed", "lepidocrocite", "13. Climate action", "microsite", "Adsorption", "isotope", "Oxidation-Reduction"]}, "links": [{"href": "https://pubs.acs.org/doi/pdf/10.1021/acs.est.4c01519"}, {"href": "https://doi.org/10.1021/acs.est.4c01519"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Science%20%26amp%3B%20Technology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1021/acs.est.4c01519", "name": "item", "description": "10.1021/acs.est.4c01519", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1021/acs.est.4c01519"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-06-04T00:00:00Z"}}, {"id": "10.1021/acs.est.7b02944", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:00Z", "type": "Journal Article", "created": "2017-10-11", "title": "Novel Multi-isotope Tracer Approach To Test ZnO Nanoparticle and Soluble Zn Bioavailability in Joint Soil Exposures", "description": "Here we use two enriched stable isotopes, 68Znen and 64Znen (>99%), to prepare 68ZnO nanoparticles (NPs) and soluble 64ZnCl2. The standard LUFA 2.2 test soil was dosed with 68ZnO NPs and soluble 64ZnCl2 to 5 mg kg-1 each, plus between 0 and 95 mg kg-1 of soluble ZnCl2 with a natural isotope composition. After 0, 1, 3, 6, and 12 months of soil incubation, earthworms (Eisenia andrei) were introduced for 72 h exposures. Analyses of soils, pore waters, and earthworm tissues using multiple collector inductively coupled plasma mass spectrometry allowed the simultaneous measurement of the diagnostic 68Zn/66Zn, 64Zn/66Zn, and 68Zn/64Zn ratios, from which the three different isotopic forms of Zn were quantified. Eisenia andrei was able to regulate Zn body concentrations with no difference observed between the different total dosing concentrations. The accumulation of labeled Zn by the earthworms showed a direct relationship with the proportion of labeled to total Zn in the pore water, which increased with longer soil incubation times and decreasing soil pH. The 68Znen/64Znen ratios determined for earthworms (1.09 \u00b1 0.04), soils (1.09 \u00b1 0.02), and pore waters (1.08 \u00b1 0.02) indicate indistinguishable environmental distribution and uptake of the Zn forms, most likely due to rapid dissolution of the ZnO NPs.", "keywords": ["104002 Analytische Chemie", "550", "TRANSFORMATIONS", "FATE", "0211 other engineering and technologies", "Biological Availability", "02 engineering and technology", "01 natural sciences", "Soil", "104002 Analytical chemistry", "104023 Umweltchemie", "ENGINEERED NANOMATERIALS", "MD Multidisciplinary", "Animals", "Soil Pollutants", "105906 Environmental geosciences", "210004 Nanomaterials", "Oligochaeta", "EARTHWORM EISENIA-ANDREI", "0105 earth and related environmental sciences", "ENVIRONMENT", "104023 Environmental chemistry", "KNOWLEDGE GAPS", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "6. Clean water", "Zinc", "Nanoparticles", "Zinc Isotopes", "Zinc Oxide", "210004 Nanomaterialien", "Environmental Sciences", "105906 Umweltgeowissenschaften"]}, "links": [{"href": "https://pubs.acs.org/doi/pdf/10.1021/acs.est.7b02944"}, {"href": "https://doi.org/10.1021/acs.est.7b02944"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Science%20%26amp%3B%20Technology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1021/acs.est.7b02944", "name": "item", "description": "10.1021/acs.est.7b02944", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1021/acs.est.7b02944"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-10-26T00:00:00Z"}}, {"id": "10.1023/b:plso.0000020975.75850.ca", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:12Z", "type": "Journal Article", "created": "2004-03-24", "title": "Isotopic Estimates Of New Carbon Inputs Into Litter And Soils In A Four-Year Climate Change Experiment With Douglas-Fir", "description": "Because soil is a major reservoir of terrestrial carbon and a potential sink for atmospheric CO2, determining plant inputs to soil carbon is critical for understanding ecosystem carbon dynamics. We present a modified method to quantify the effects of global climate change on plant inputs of carbon to soil based on 13C:12C ratio (\u03b413C) analyses that accounts for isotopic fractionation between inputs and newly created soil carbon. In a four-year study, the effects of elevated CO2 and temperature were determined for reconstructed Douglas-fir (Pseudotsuga mensiezii (Mirb.) Franco) ecosystems in which native soil of low nitrogen content was used. The \u03b413C patterns in litter and mineral soil horizons were measured and compared to \u03b413C patterns in live needles, fine roots, and coarse roots. From regression analyses, we calculated the isotopic enrichment in 13C of newly incorporated soil carbon relative to needle and root carbon at 4\u2030 and 2\u2030, respectively. These enrichments must be considered when using shifts in soil \u03b413C to calculate inputs of plant carbon into the soil, and are probably a major factor in the progressive enrichment in 13C with increasing depth in soil profiles. Relative to the total carbon in each layer, the proportion of new carbon from recent photosynthate in each soil layer was 13\u201315% in the A horizon, 7\u20139% in litter layers, and 4% in the B2 and C horizons. New carbon in the A horizon was estimated at 370\u00a0g C\u00a0m\u22122. Carbon concentrations and new carbon in A horizons were correlated (r 2=0.78, n=12), but with a slope of 0.356, indicating that about 36% of net carbon accumulation in the A horizon was from inputs via roots, root exudates or mycorrhizal fungi and 64% of carbon was derived from surface litter decomposition. Under the nitrogen-limited growth conditions used in this study, neither elevated CO2 nor temperature affected soil carbon sequestration patterns.", "keywords": ["elevated temperature", "13. Climate action", "soil carbon turnover", "elevated carbon dioxide", "stable isotopes", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "mesocosms", "15. Life on land", "global change", "isotopic discrimination"], "contacts": [{"organization": "Hobbie, Erik A., Johnson, M. G., Rygiewicz, Paul T., Tingey, David T., Olszyk, David M.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1023/b:plso.0000020975.75850.ca"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1023/b:plso.0000020975.75850.ca", "name": "item", "description": "10.1023/b:plso.0000020975.75850.ca", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/b:plso.0000020975.75850.ca"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2004-02-01T00:00:00Z"}}, {"id": "10.1029/2021gc009904", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:16Z", "type": "Journal Article", "created": "2021-10-26", "title": "Quantifying Non\u2010Thermal Silicate Weathering Using Ge/Si and Si Isotopes in Rivers Draining the Yellowstone Plateau Volcanic Field, USA", "description": "AbstractIn active volcanic regions, high\uffe2\uff80\uff90temperature chemical reactions in the hydrothermal system consume CO2 sourced from magma or from the deep crust, whereas reactions with silicates at shallow depths mainly consume atmospheric CO2. Numerous studies have quantified the load of dissolved solids in rivers that drain volcanic regions to determine chemical weathering rates and atmospheric CO2 consumption rates. However, the balance between thermal and non\uffe2\uff80\uff90thermal components to riverine fluxes in these areas remains poorly constrained, hindering accurate estimates of atmospheric CO2 consumption rates. Here we use the Ge/Si ratio and the stable silicon isotopes (\uffce\uffb430Si) as tracers for quantifying non\uffe2\uff80\uff90thermal silicon contributions in rivers draining the Yellowstone Plateau Volcanic Field, USA. The Ge/Si ratio (\uffc2\uffb5mol.mol\uffe2\uff88\uff921) was determined for seven thermal water samples (183\uffc2\uffa0\uffc2\uffb1\uffc2\uffa022), eight rivers (35\uffc2\uffa0\uffc2\uffb1\uffc2\uffa023) and six creeks flowing into Yellowstone Lake (5\uffc2\uffa0\uffc2\uffb1\uffc2\uffa03) during base flow and during peak water discharge following snowmelt. The \uffce\uffb430Si value (\uffe2\uff80\uffb0) was determined for thermal waters (\uffe2\uff88\uff920.09\uffc2\uffa0\uffc2\uffb1\uffc2\uffa00.04), Yellowstone River at Yellowstone Lake outlet (1.91\uffc2\uffa0\uffc2\uffb1\uffc2\uffa00.23) and creek samples (0.82\uffc2\uffa0\uffc2\uffb1\uffc2\uffa00.29). The calculated atmospheric CO2 consumption associated with non\uffe2\uff80\uff90thermal waters flowing through Yellowstone's rivers during peak discharge is \uffe2\uff88\uffbc3.03 ton.km\uffe2\uff88\uff922.yr\uffe2\uff88\uff921, which is \uffe2\uff88\uffbc2% of the annual mean atmospheric CO2 consumption in other volcanic regions. This study highlights the significance of quantifying seasonal variations in chemical weathering rates for improving estimates of atmospheric CO2 consumption rates in active volcanic regions.Low estimated lunar volatile contents, compared with Earth, are a fundamental observation for Earth\uffe2\uff80\uff93Moon system formation and lunar evolution. Here we present zinc isotope and abundance data for lunar crustal rocks to constrain the abundance of volatiles during the final stages of lunar differentiation. We find that ferroan anorthosites are isotopically heterogeneous, with some samples exhibiting high \uffce\uffb466Zn, along with alkali and magnesian suite samples. Since the plutonic samples were formed in the lunar crust, they were not subjected to degassing into vacuum. Instead, their compositions are consistent with enrichment of the silicate portions of the Moon in the heavier Zn isotopes. Because of the difference in \uffce\uffb466Zn between bulk silicate Earth and lunar basalts and crustal rocks, the volatile loss likely occurred in two stages: during the proto-lunar disk stage, where a fraction of lunar volatiles accreted onto Earth, and from degassing of a differentiating lunar magma ocean, implying the possibility of isolated, volatile-rich regions in the Moon\uffe2\uff80\uff99s interior.
", "keywords": ["2. Zero hunger", "ISOTOPE FRACTIONATION", "ORIGIN", "IRON", "COPPER", "01 natural sciences", "Article", "[SDU] Sciences of the Universe [physics]", "ZINC", "ABUNDANCES", "13. Climate action", "LUNAR VOLCANIC GLASSES", "WATER", "EARTH", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://www.nature.com/articles/ncomms8617.pdf"}, {"href": "https://doi.org/10.1038/ncomms8617"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nature%20Communications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/ncomms8617", "name": "item", "description": "10.1038/ncomms8617", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/ncomms8617"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-07-03T00:00:00Z"}}, {"id": "10.1038/s41467-017-00192-5", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:22Z", "type": "Journal Article", "created": "2017-08-02", "title": "Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth\u2019s atmosphere", "description": "AbstractChemical fingerprints of impacts are usually compromised by extreme conditions in the impact plume, and the contribution of projectile matter to impactites does not often exceed a fraction of per cent. Here we use chromium and oxygen isotopes to identify the impactor and impact-plume processes for Zhamanshin astrobleme, Kazakhstan. \uffce\uffb554Cr values up to 1.54 in irghizites, part of the fallback ejecta, represent the54Cr-rich extremity of the Solar System range and suggest a CI-like chondrite impactor. \uffce\uff9417O values as low as \uffe2\uff88\uff920.22\uffe2\uff80\uffb0 in irghizites, however, are incompatible with a CI-like impactor. We suggest that the observed17O depletion in irghizites relative to the terrestrial range is caused by partial isotope exchange with atmospheric oxygen (\uffce\uff9417O\uffe2\uff80\uff89=\uffe2\uff80\uff89\uffe2\uff88\uff920.47\uffe2\uff80\uffb0) following material ejection. In contrast, combined \uffce\uff9417O\uffe2\uff80\uff93\uffce\uffb554Cr data for central European tektites (distal ejecta) fall into the terrestrial range and neither impactor fingerprint nor oxygen isotope exchange with the atmosphere are indicated.
", "keywords": ["OXYGEN-ISOTOPE COMPOSITION", "NORDLINGER RIES IMPACT", "ORIGIN", "FRACTIONATION", "carbonaceous chondrite; post-impact exchange; ejecta; Earth\u2019s atmosphere", "Science", "Q", "TARGET ROCKS", "[SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]", "551", "01 natural sciences", "Article", "IVORY-COAST TEKTITES", "13. Climate action", "CRATER", "GLASSES", "ELEMENTS", "WATER", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://www.nature.com/articles/s41467-017-00192-5.pdf"}, {"href": "https://doi.org/10.1038/s41467-017-00192-5"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nature%20Communications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/s41467-017-00192-5", "name": "item", "description": "10.1038/s41467-017-00192-5", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/s41467-017-00192-5"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-09T00:00:00Z"}}, {"id": "10.1038/s41467-018-05980-1", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-27T16:19:22Z", "type": "Journal Article", "created": "2018-08-29", "title": "Land use driven change in soil pH affects microbial carbon cycling processes", "description": "AbstractSoil microorganisms act as gatekeepers for soil\uffe2\uff80\uff93atmosphere carbon exchange by balancing the accumulation and release of soil organic matter. However, poor understanding of the mechanisms responsible hinders the development of effective land management strategies to enhance soil carbon storage. Here we empirically test the link between microbial ecophysiological traits and topsoil carbon content across geographically distributed soils and land use contrasts. We discovered distinct pH controls on microbial mechanisms of carbon accumulation. Land use intensification in low-pH soils that increased the pH above a threshold (~6.2) leads to carbon loss through increased decomposition, following alleviation of acid retardation of microbial growth. However, loss of carbon with intensification in near-neutral pH soils was linked to decreased microbial biomass and reduced growth efficiency that was, in turn, related to trade-offs with stress alleviation and resource acquisition. Thus, less-intensive management practices in near-neutral pH soils have more potential for carbon storage through increased microbial growth efficiency, whereas in acidic soils, microbial growth is a bigger constraint on decomposition rates.Magnesium is the metal at the center of all types of chlorophyll and is thus crucial to photosynthesis. When an element is involved in a biosynthetic pathway its isotopes are fractionated based on the difference of vibrational frequency between the different molecules. With the technical advance of multi-collectors plasma-mass-spectrometry and improvement in analytical precision, it has recently been found that two types of chlorophylls (a and b) are isotopically distinct. These results have very significant implications with regards to the use of Mg isotopes to understand the biosynthesis of chlorophyll. Here we present theoretical constraints on the origin of these isotopic fractionations through ab initio calculations. We present the fractionation factor for chlorphyll a, b, d, and f. We show that the natural isotopic variations among chlorophyll a and b are well explained by isotopic fractionation under equilibrium, which implies exchanges of Mg during the chlorophyll cycle. We predict that chlorophyll d and f should be isotopically fractionated compared to chlorophyll a and that this could be used in the future to understand the biosynthesis of these molecules.
", "keywords": ["Chlorophyll", "0301 basic medicine", "0303 health sciences", "RELEVANT", "Molecular Structure", "PHOTOSYNTHESIS", "Science", "Q", "POTENTIALS", "R", "Chemical Fractionation", "Fe", "Article", "3. Good health", "[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry", "[CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry", "03 medical and health sciences", "Isotopes", "Zn", "Medicine", "PLANTS", "Magnesium", "[SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry", " Molecular Biology/Biochemistry [q-bio.BM]", "GEOCHEMISTRY", "[SDV.BBM.BC] Life Sciences [q-bio]/Biochemistry", " Molecular Biology/Biochemistry [q-bio.BM]"], "contacts": [{"organization": "Fr\u00e9d\u00e9ric Moynier, Fr\u00e9d\u00e9ric Moynier, Toshiyuki Fujii,", "roles": ["creator"]}]}, "links": [{"href": "https://www.nature.com/articles/s41598-017-07305-6.pdf"}, {"href": "https://doi.org/10.1038/s41598-017-07305-6"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Scientific%20Reports", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/s41598-017-07305-6", "name": "item", "description": "10.1038/s41598-017-07305-6", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/s41598-017-07305-6"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-01T00:00:00Z"}}, {"id": "10.1038/s41598-022-23728-2", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-27T16:19:29Z", "type": "Journal Article", "created": "2022-11-10", "title": "DNA stable isotope probing on soil treated by plant biostimulation and flooding revealed the bacterial communities involved in PCB degradation", "description": "AbstractPolychlorinated biphenyl (PCB)-contaminated soils represent a major treat for ecosystems health. Plant biostimulation of autochthonous microbial PCB degraders is a way to restore polluted sites where traditional remediation techniques are not sustainable, though its success requires the understanding of site-specific plant\uffe2\uff80\uff93microbe interactions. In an historical PCB contaminated soil, we applied DNA stable isotope probing (SIP) using 13C-labeled 4-chlorobiphenyl (4-CB) and 16S rRNA MiSeq amplicon sequencing to determine how the structure of total and PCB-degrading bacterial populations were affected by different treatments: biostimulation with Phalaris arundinacea subjected (PhalRed) or not (Phal) to a redox cycle and the non-planted controls (Bulk and BulkRed). Phal soils hosted the most diverse community and plant biostimulation induced an enrichment of Actinobacteria. Mineralization of 4-CB in SIP microcosms varied between 10% in Bulk and 39% in PhalRed soil. The most abundant taxa deriving carbon from PCB were Betaproteobacteria and Actinobacteria. Comamonadaceae was the family most represented in Phal soils, Rhodocyclaceae and Nocardiaceae in non-planted soils. Planted soils subjected to redox cycle enriched PCB degraders affiliated to Pseudonocardiaceae, Micromonosporaceae and Nocardioidaceae. Overall, we demonstrated different responses of soil bacterial taxa to specific rhizoremediation treatments and we provided new insights into the populations active in PCB biodegradation.Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems and climate forcing. With limited direct measures of soil N cycling at the global scale, syntheses of the 15N:14N ratio of soil organic matter across climate gradients provide key insights into understanding global patterns of N cycling. In synthesizing data from over 6000 soil samples, we show strong global relationships among soil N isotopes, mean annual temperature (MAT), mean annual precipitation (MAP) and the concentrations of organic carbon and clay in soil. In both hot ecosystems and dry ecosystems, soil organic matter was more enriched in 15N than in corresponding cold ecosystems or wet ecosystems. Below a MAT of 9.8\uffc2\uffb0C, soil \uffce\uffb415N was invariant with MAT. At the global scale, soil organic C concentrations also declined with increasing MAT and decreasing MAP. After standardizing for variation among mineral soils in soil C and clay concentrations, soil \uffce\uffb415N showed no consistent trends across global climate and latitudinal gradients. Our analyses could place new constraints on interpretations of patterns of ecosystem N cycling and global budgets of gaseous N loss.
", "keywords": ["N-15 Natural-Abundance", "550", "Ecosystem ecology", "TROPICAL FORESTS", "Organic chemistry", "Suelo", "Nitrogen cycle", "01 natural sciences", "Nutrient cycle", "cycle de l'azote", "CARBON", "Agricultural and Biological Sciences", "Soil", "Terrestrial ecosystem", "Isotopes", "https://purl.org/becyt/ford/1.6", "Soil water", "SDG 13 - Climate Action", "N-15 NATURAL-ABUNDANCE", "Climate change", "croisement de donn\u00e9es", "Milieux et Changements globaux", "SDG 15 \u2013 Leben an Land", "Global change", "SDG 15 - Life on Land", "2. Zero hunger", "106022 Mikrobiologie", "Climatic Factors", "Tropical Forests", "Ecology", "Geography", "Nitr\u00f3geno", "Nutrient Cycling", "FRACTIONATION", "Litter Decomposition", "ECOSYSTEM ECOLOGY", "Life Sciences", "ecosystem ecology", "Cycling", "Forestry", "Is\u00f3topos", "Carbon cycle", "04 agricultural and veterinary sciences", "Nitrogen Cycle", "Soil carbon", "6. Clean water", "Organic-Matter", "Earth and Planetary Sciences", "ORGANIC-MATTER", "Chemistry", "PRECIPITATION", "SDG 13 \u2013 Ma\u00dfnahmen zum Klimaschutz", "Physical Sciences", "106022 Microbiology", "carbone du sol", "Stable Isotope Analysis of Groundwater and Precipitation", "Ecosystem Functioning", "570", "STABLE ISOTOPE", "Biogeochemical Cycling of Nutrients in Aquatic Ecosystems", "Stable isotope analysis", "Nitrogen", "[SDE.MCG]Environmental Sciences/Global Changes", "Soil Science", "stable isotope analysis;ecosystem ecology", "Article", "Environmental science", "LITTER DECOMPOSITION", "sol min\u00e9ral", "INORGANIC NITROGEN", "Geochemistry and Petrology", "stable isotope analysis", "Carbono", "Environmental Chemistry", "Factores Clim\u00e1ticos", "https://purl.org/becyt/ford/1", "Biology", "Ecosystem", "0105 earth and related environmental sciences", "Soil science", "Soil organic matter", "Soil Fertility", "climat", "AVAILABILITY", "Nitrogen Dynamics", "15. Life on land", "Carbon", "Inorganic", "NITROGEN", "MODEL", "[SDE.MCG] Environmental Sciences/Global Changes", "13. Climate action", "FOS: Biological sciences", "Environmental Science", "PATTERNS", "0401 agriculture", " forestry", " and fisheries", "Soil Carbon Dynamics and Nutrient Cycling in Ecosystems"]}, "links": [{"href": "https://scholars.unh.edu/context/faculty_pubs/article/1042/viewcontent/srep08280.pdf"}, {"href": "https://edoc.unibas.ch/37215/1/srep08280.pdf"}, {"href": "https://doi.org/10.1038/srep08280"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Scientific%20Reports", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/srep08280", "name": "item", "description": "10.1038/srep08280", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/srep08280"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-02-06T00:00:00Z"}}, {"id": "10.1186/s40793-021-00386-x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:21:28Z", "type": "Journal Article", "created": "2021-08-26", "title": "Isoprene-degrading bacteria associated with the phyllosphere of Salix fragilis, a high isoprene-emitting willow of the northern hemisphere", "description": "AbstractBackgroundIsoprene accounts for about half of total biogenic volatile organic compound emissions globally, and as a climate active gas it plays a significant and varied role in atmospheric chemistry. Terrestrial plants are the largest source of isoprene, with willow (Salix) making up one of the most active groups of isoprene producing trees. Bacteria act as a biological sink for isoprene and those bacteria associated with high isoprene-emitting trees may provide further insight into its biodegradation.
ResultsA DNA-SIP experiment incubating willow (Salix fragilis) leaves with13C-labelled isoprene revealed an abundance ofComamonadaceae, Methylobacterium, MycobacteriumandPolaromonasin the isoprene degrading community when analysed by 16S rRNA gene amplicon sequencing. Metagenomic analysis of13C-enriched samples confirmed the abundance ofComamonadaceae, Acidovorax, Polaromonas, VariovoraxandRamlibacter. MycobacteriumandMethylobacteriumwere also identified after metagenomic analysis and aMycobacteriummetagenome-assembled genome (MAG) was recovered. This contained two complete isoprene degradation metabolic gene clusters, along with a propane monooxygenase gene cluster. Analysis of the abundance of the alpha subunit of the isoprene monooxygenase,isoA,in unenriched DNA samples revealed that isoprene degraders associated with willow leaves are abundant, making up nearly 0.2% of the natural bacterial community.
ConclusionsAnalysis of the isoprene degrading community associated with willow leaves using DNA-SIP and focused metagenomics techniques enabled recovery of the genome of an active isoprene-degradingMycobacteriumspecies and provided valuable insight into bacteria involved in degradation of isoprene on the leaves of a key species of isoprene-emitting tree in the northern hemisphere.
", "keywords": ["Salix fragilis", "2. Zero hunger", "0301 basic medicine", "570", "0303 health sciences", "isoprene monooxygenase", "Isoprene", "Climate", "isoA", "15. Life on land", "Microbiology", "630", "QR1-502", "6. Clean water", "Environmental sciences", "03 medical and health sciences", "Willow tree", "13. Climate action", "Isoprene monooxygenase", "GE1-350", "willow tree", "isoprene", "climate", "DNA stable isotope probing", "Research Article"]}, "links": [{"href": "https://ueaeprints.uea.ac.uk/id/eprint/81258/1/Published_Version.pdf"}, {"href": "https://link.springer.com/content/pdf/10.1186/s40793-021-00386-x.pdf"}, {"href": "https://doi.org/10.1186/s40793-021-00386-x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Microbiome", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1186/s40793-021-00386-x", "name": "item", "description": "10.1186/s40793-021-00386-x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1186/s40793-021-00386-x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-08-26T00:00:00Z"}}, {"id": "10.1038/srep44255", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:32Z", "type": "Journal Article", "created": "2017-03-09", "title": "Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine", "description": "AbstractStable Ca isotopes are fractionated between bones, urine and blood of animals and between soils, roots and leaves of plants by >1000\uffe2\uff80\uff89ppm for the 44Ca/40Ca ratio. These isotopic variations have important implications to understand Ca transport and fluxes in living organisms; however, the mechanisms of isotopic fractionation are unclear. Here we present ab initio calculations for the isotopic fractionation between various aqueous species of Ca and show that this fractionation can be up to 3000\uffe2\uff80\uff89ppm. We show that the Ca isotopic fractionation between soil solutions and plant roots can be explained by the difference of isotopic fractionation between the different first shell hydration degree of Ca2+ and that the isotopic fractionation between roots and leaves is controlled by the precipitation of Ca-oxalates. The isotopic fractionation between blood and urine is due to the complexation of heavy Ca with citrate and oxalates in urine. Calculations are presented for additional Ca species that may be useful to interpret future Ca isotopic measurements.
", "keywords": ["Calcium Isotopes", "Chemical Fractionation", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "FE", "Plant Roots", "01 natural sciences", "Article", "Bone and Bones", "[SDU] Sciences of the Universe [physics]", "Soil", "PHOSPHATE", "Animals", "Humans", "ION", "MONITOR", "0105 earth and related environmental sciences", "ENVIRONMENT", "CA", "PLASMA", "Temperature", "Plants", "6. Clean water", "3. Good health", "Plant Leaves", "MAGNESIUM", "13. Climate action", "OXALATE", "[SDU.STU] Sciences of the Universe [physics]/Earth Sciences", "BONE"], "contacts": [{"organization": "Moynier, Fr\u00e9d\u00e9ric, Fujii, Toshiyuki,", "roles": ["creator"]}]}, "links": [{"href": "https://www.nature.com/articles/srep44255.pdf"}, {"href": "https://doi.org/10.1038/srep44255"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Scientific%20Reports", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/srep44255", "name": "item", "description": "10.1038/srep44255", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/srep44255"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-03-09T00:00:00Z"}}, {"id": "10.1046/j.1365-2486.1999.00211.x", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-06-27T16:19:36Z", "type": "Journal Article", "created": "2003-03-11", "title": "Elevated Co2 And Temperature Impacts On Different Components Of Soil Co2 Efflux In Douglas-Fir Terracosms", "description": "AbstractAlthough numerous studies indicate that increasing atmospheric CO2 or temperature stimulate soil CO2 efflux, few data are available on the responses of three major components of soil respiration [i.e. rhizosphere respiration (root and root exudates), litter decomposition, and oxidation of soil organic matter] to different CO2 and temperature conditions. In this study, we applied a dual stable isotope approach to investigate the impact of elevated CO2 and elevated temperature on these components of soil CO2 efflux in Douglas\uffe2\uff80\uff90fir terracosms. We measured both soil CO2 efflux rates and the 13C and 18O isotopic compositions of soil CO2 efflux in 12 sun\uffe2\uff80\uff90lit and environmentally controlled terracosms with 4\uffe2\uff80\uff90year\uffe2\uff80\uff90old Douglas fir seedlings and reconstructed forest soils under two CO2 concentrations (ambient and 200 ppmv above ambient) and two air temperature regimes (ambient and 4 \uffc2\uffb0C above ambient). The stable isotope data were used to estimate the relative contributions of different components to the overall soil CO2 efflux. In most cases, litter decomposition was the dominant component of soil CO2 efflux in this system, followed by rhizosphere respiration and soil organic matter oxidation. Both elevated atmospheric CO2 concentration and elevated temperature stimulated rhizosphere respiration and litter decomposition. The oxidation of soil organic matter was stimulated only by increasing temperature. Release of newly fixed carbon as root respiration was the most responsive to elevated CO2, while soil organic matter decomposition was most responsive to increasing temperature. Although some assumptions associated with this new method need to be further validated, application of this dual\uffe2\uff80\uff90isotope approach can provide new insights into the responses of soil carbon dynamics in forest ecosystems to future climate changes.
", "keywords": ["elevated CO2", "13. Climate action", "stable isotopes", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "forest ecosystem", "15. Life on land", "global warming", "soil respiration"], "contacts": [{"organization": "Guanghui Lin, Guanghui Lin, Mark Johnson, David T. Tingey, James R. Ehleringer, Paul T. Rygiewicz,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1046/j.1365-2486.1999.00211.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Global%20Change%20Biology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1046/j.1365-2486.1999.00211.x", "name": "item", "description": "10.1046/j.1365-2486.1999.00211.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1046/j.1365-2486.1999.00211.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1999-02-01T00:00:00Z"}}, {"id": "10.1056/nejm199703063361004", "type": "Feature", "geometry": null, "properties": {"license": "unspecified", "updated": "2026-06-27T16:19:42Z", "type": "Journal Article", "created": "2002-07-27", "title": "Sympathetic Cardioneuropathy in Dysautonomias", "description": "The classification of dysautonomias has been confusing, and the pathophysiology obscure. We examined sympathetic innervation of the heart in patients with acquired, idiopathic dysautonomias using thoracic positron-emission tomography and assessments of the entry rate of the sympathetic neurotransmitter norepinephrine into the cardiac venous drainage (cardiac norepinephrine spillover). We related the laboratory findings to signs of sympathetic neurocirculatory failure (orthostatic hypotension and abnormal blood-pressure responses associated with the Valsalva maneuver), central neural degeneration, and responsiveness to treatment with levodopa-carbidopa (Sinemet).Cardiac scans were obtained after intravenous administration of 6-[18F]fluorodopamine in 26 patients with dysautonomia. Fourteen had sympathetic neurocirculatory failure--three with no signs of central neurodegeneration (pure autonomic failure), two with parkinsonism responsive to treatment with levodopa-carbidopa, and nine with central neurodegeneration unresponsive to treatment with levodopa-carbidopa (the Shy-Drager syndrome). The rates of cardiac norepinephrine spillover were estimated on the basis of concentrations of intravenously infused [3H]norepinephrine during catheterization of the right side of the heart.Patients with pure autonomic failure or parkinsonism and sympathetic neurocirculatory failure had no myocardial 6-[18F]fluorodopamine-derived radioactivity or cardiac norepinephrine spillover, indicating loss of myocardial sympathetic-nerve terminals, whereas patients with the Shy-Drager syndrome had increased levels of 6-[18F]fluorodopamine-derived radioactivity, indicating intact sympathetic terminals and absent nerve traffic. Patients with dysautonomia who did not have sympathetic neurocirculatory failure had normal levels of 6-[18F]fluorodopamine-derived radioactivity in myocardium and normal rates of cardiac norepinephrine spillover.The results of 6-[18F]fluorodopamine positron-emission tomography and neurochemical analyses support a new clinical pathophysiologic classification of dysautonomias, based on the occurrence of sympathetic neurocirculatory failure, signs of central neurodegeneration, and responsiveness to levodopa-carbidopa.", "keywords": ["Adult", "Aged", " 80 and over", "Fluorine Radioisotopes", "Nitrogen Radioisotopes", "Sympathetic Nervous System", "Epinephrine", "Dopamine", "Myocardium", "Shy-Drager Syndrome", "Heart", "Parkinson Disease", "Middle Aged", "3. Good health", "Diagnosis", " Differential", "Levodopa", "Norepinephrine", "Autonomic Nervous System Diseases", "Ammonia", "Parasympathetic Nervous System", "Reference Values", "Coronary Circulation", "Humans", "Aged", "Tomography", " Emission-Computed"], "contacts": [{"organization": "Graeme Eisenhofer, Richard O. Cannon, Irwin J. Kopin, Courtney Holmes, David S. Goldstein,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1056/nejm199703063361004"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/New%20England%20Journal%20of%20Medicine", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1056/nejm199703063361004", "name": "item", "description": "10.1056/nejm199703063361004", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1056/nejm199703063361004"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1997-01-01T00:00:00Z"}}, {"id": "10.1073/pnas.1613401114", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-27T16:19:50Z", "type": "Journal Article", "created": "2017-01-31", "title": "Siberian Arctic black carbon sources constrained by model and observation", "description": "SignificanceA successful mitigation strategy for climate warming agents such as black carbon (BC) requires reliable source information from bottom-up emission inventory data, which can only be verified by observation. We measured BC in one of the fastest-warming and, at the same time, substantially understudied regions on our planet, the northeastern Siberian Arctic. Our observations, compared with an atmospheric transport model, imply that quantification and spatial allocation of emissions at high latitudes, specifically in the Russian Arctic, need improvement by reallocating emissions and significantly shifting source contributions for the transport, domestic, power plant, and gas flaring sectors. This strong shift in reported emissions has potentially considerable implications for climate modeling and BC mitigation efforts. The debate on the onset of plate tectonics in the Earth\uffe2\uff80\uff99s history has partially originated from the controversial criteria of using felsic crust to trace plate tectonics in the past. Here, we demonstrate how Ti isotope ratios can be used as a proxy for the affinity of felsic rocks to plume or island arc settings. Our study shows that, contrary to what was previously assumed, Ti isotopes cannot serve as a direct evidence for plate tectonics from 3.5 billion years ago, and must be combined with other information on SiO 2 contents of crustal rocks to be reliable.
", "keywords": ["Titanium isotopes", "Plume", "Magma differentiation", "magma differentiation", "GE", "550", "plume", "Plate tectonics", "[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics", "DAS", "island arc", "7. Clean energy", "01 natural sciences", "13. Climate action", "plate tectonics", "[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry", "Island arc", "titanium isotopes", "GE Environmental Sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://pnas.org/doi/pdf/10.1073/pnas.1809164116"}, {"href": "https://doi.org/10.1073/pnas.1809164116"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%20National%20Academy%20of%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1073/pnas.1809164116", "name": "item", "description": "10.1073/pnas.1809164116", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1073/pnas.1809164116"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-01-03T00:00:00Z"}}, {"id": "10.1073/pnas.1905912116", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-27T16:19:50Z", "type": "Journal Article", "created": "2019-08-06", "title": "Disentangling the role of photosynthesis and stomatal conductance on rising forest water-use efficiency", "description": "Multiple lines of evidence suggest that plant water-use efficiency (WUE)\uffe2\uff80\uff94the ratio of carbon assimilation to water loss\uffe2\uff80\uff94has increased in recent decades. Although rising atmospheric CO 2 has been proposed as the principal cause, the underlying physiological mechanisms are still being debated, and implications for the global water cycle remain uncertain. Here, we addressed this gap using 30-y tree ring records of carbon and oxygen isotope measurements and basal area increment from 12 species in 8 North American mature temperate forests. Our goal was to separate the contributions of enhanced photosynthesis and reduced stomatal conductance to WUE trends and to assess consistency between multiple commonly used methods for estimating WUE. Our results show that tree ring-derived estimates of increases in WUE are consistent with estimates from atmospheric measurements and predictions based on an optimal balancing of carbon gains and water costs, but are lower than those based on ecosystem-scale flux observations. Although both physiological mechanisms contributed to rising WUE, enhanced photosynthesis was widespread, while reductions in stomatal conductance were modest and restricted to species that experienced moisture limitations. This finding challenges the hypothesis that rising WUE in forests is primarily the result of widespread, CO 2 -induced reductions in stomatal conductance. Extensive release of methane from sediments of the world\uffe2\uff80\uff99s largest continental shelf, the East Siberian Arctic Ocean (ESAO), is one of the few Earth system processes that can cause a net transfer of carbon from land/ocean to the atmosphere and thus amplify global warming on the timescale of this century. An important gap in our current knowledge concerns the contributions of different subsea pools to the observed methane releases. This knowledge is a prerequisite to robust predictions on how these releases will develop in the future. Triple-isotope\uffe2\uff80\uff93based fingerprinting of the origin of the highly elevated ESAO methane levels points to a limited contribution from shallow microbial sources and instead a dominating contribution from a deep thermogenic pool.The depletion of moderately volatile elements in the lunar interior, compared to the Earth\uffe2\uff80\uff99s interior, is accompanied by enrichment in heavy isotopes for most species. This has been explained by vapor loss from the protolunar disk, incomplete accretion of volatiles, or volatile degassing during crystallization of the lunar magma ocean. Importantly, these hypotheses have assumed that volatile depletion and associated isotope fractionations are relevant to the whole Moon. However, our lunar sample collections are biased, as Apollo and Luna samples come from within or around the anomalous Procellarum KREEP Terrane region on the lunar nearside. Here, we propose that these chemical and isotopic features could have resulted from a large-scale impact event on the nearside early in the Moon\uffe2\uff80\uff99s history.
", "keywords": ["UAT:1692", "[SDU] Sciences of the Universe [physics]", "lunar samples", "13. Climate action", "stable isotopes", "Lunar volatiles; the Moon; Procellarum KREEP Terrane; Lunar samples; Stable isotopes", "lunar volatiles", "Procellarum KREEP Terrane", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://pnas.org/doi/pdf/10.1073/pnas.2023023118"}, {"href": "https://doi.org/10.1073/pnas.2023023118"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%20National%20Academy%20of%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1073/pnas.2023023118", "name": "item", "description": "10.1073/pnas.2023023118", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1073/pnas.2023023118"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-03-15T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=isotope&offset=50&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=isotope&offset=50&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "prev", "title": "items (prev)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=isotope&offset=0", "hreflang": "en-US"}, {"rel": "next", "type": "application/geo+json", "title": "items (next)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=isotope&offset=100", "hreflang": "en-US"}], "numberMatched": 268, "numberReturned": 50, "distributedFeatures": [], "timeStamp": "2026-06-27T22:22:17.332641Z"}