{"type": "FeatureCollection", "features": [{"id": "10.1016/j.gca.2019.07.043", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:16:18Z", "type": "Journal Article", "created": "2019-08-01", "title": "Tracking the volatile and magmatic history of Vesta from chromium stable isotope variations in eucrite and diogenite meteorites", "description": "Abstract   Although Solar System bodies exhibit large variations in their volatile element abundances, the mechanisms and conditions that lead to these variations remain ambiguous. The howardite-eucrite-diogenite (HED) meteorites that likely sample the asteroid 4 Vesta, provide evidence for extensive volatile depletion on their parent body. Isotopic variations in moderately volatile elements, such as Zn, have been used to track the origin of such volatile loss. Although not nominally volatile, Cr is useful because it has several oxidized gas species that render it volatile under the oxidizing conditions that characterize planetary accretion. As such, volatile loss of Cr has the potential to produce an isotopically light evaporation residue under an equilibrium regime. This contrasts with other moderately volatile elements that show heavy isotope enrichments in the residue following both kinetic or equilibrium fractionation. Here, we report the Cr stable isotope composition of 11 eucrites and four diogenites. The eucrites possess systematically lighter Cr isotope compositions than diogenites, which is onset by the accumulation of isotopically heavy Cr3+-rich orthopyroxene and spinel in diogenites during their magmatic evolution. We estimate for the primary eucrite melt with Mg# \u2248 50, a \u03b453Cr (53Cr/52Cr deviation relative to NIST SRM 979 in per mile) of \u22120.22\u202f\u00b1\u202f0.03\u2030 (2SD), lighter than any chondritic meteorite group by \u223c0.1\u2030. This deficit may result from either partial melting with residual Cr3+-bearing phases (e.g. chromite) that retain heavy isotopes, or from vapor loss that occurred at equilibrium with a magma ocean on Vesta. Isotopic fractionation during partial melting would necessitate implausibly high Cr contents in the Vestan mantle, and oxygen fugacities high enough to stabilize chromite in the mantle source. Isotopic fractionation during evaporation would require an oxidized vapor and a reduced residue, as predicted by thermodynamic constraints on the composition of the vapor phase above a silicate magma ocean. Therefore, this Cr isotopic deficit between Vesta and chondrites may be caused by Cr loss at relatively high oxygen fugacity in a gas phase at equilibrium with the liquid from which it evolved. Temperatures of volatile loss are estimated to be lower than 2300\u202fK, consistent with loss from a large-scale magma ocean model for formation of Vesta, which may be a common evolutionary stage in accreting planetesimals.", "keywords": ["Magma ocean", "550", "Volatile history", "500", "Volatile elements", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "7. Clean energy", "01 natural sciences", "[SDU] Sciences of the Universe [physics]", "Vesta", "Howardite-eucrite-diogenite", "13. Climate action", "Chondrites", "Cr isotopes", "Equilibrium fractionation", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.gca.2019.07.043"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Geochimica%20et%20Cosmochimica%20Acta", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.gca.2019.07.043", "name": "item", "description": "10.1016/j.gca.2019.07.043", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.gca.2019.07.043"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-12-01T00:00:00Z"}}, {"id": "10.1016/j.atmosenv.2006.07.029", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:15:44Z", "type": "Journal Article", "created": "2010-04-29", "title": "Nitric Oxide And Nitrous Oxide Emission From Hungarian Forest Soils; Linked With Atmospheric N-Deposition", "description": "<p>Abstract. Studies of forest nitrogen (N) budgets generally measure inputs to the atmosphere in wet and dry precipitation and outputs via hydrologic export. Although denitrification has been shown to be important in many wetland ecosystems, emission of nitrogen oxides from forest soils is an important, and often overlooked, component of an ecosystem nitrogen budget. During one year (2002-2003), emissions of nitric oxide (NO) and nitrous oxide (N2O) were measured from Sessile oak and Norway spruce forest soils in northeast Hungary. Accumulation in small static chambers followed by gas chromatography-mass spectrometry detection was used for the estimation of N2O emission flux. Because there are rapid chemical reactions of NO and ozone, small dynamic chambers were used for in situ NO flux measurements. Average soil emissions of NO were 1.2 and 2.1 \uffc2\uffb5gNm-2h-1, and for N2O were 15 and 20 \uffc2\uffb5gNm-2h-1, for spruce and oak soils, respectively. The previously determined nitrogen balance between the atmosphere and the forest ecosystem was re-calculated using these soil emission figures. The total (dry + wet) atmospheric N-deposition to the soil was 1.42 and 1.59gNm-2yr-1 for spruce and oak, respectively, while the soil emissions are 0.14 and 0.20 gNm-2yr-1. Thus, about 10-13% of N compounds deposited to the soil, mostly as NH3/NH4+ and HNO3/NO3-, are transformed in the soil and emitted back to the atmosphere, mostly as a greenhouse gas (N2O).                         </p>", "keywords": ["[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]", "[SDU.OCEAN] Sciences of the Universe [physics]/Ocean", " Atmosphere", "13. Climate action", "[SDU.STU] Sciences of the Universe [physics]/Earth Sciences", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "7. Clean energy", "01 natural sciences", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "6. Clean water", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.atmosenv.2006.07.029"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Atmospheric%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.atmosenv.2006.07.029", "name": "item", "description": "10.1016/j.atmosenv.2006.07.029", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.atmosenv.2006.07.029"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-06-24T00:00:00Z"}}, {"id": "10.1038/s41550-017-0055", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:17:33Z", "type": "Journal Article", "created": "2017-03-20", "title": "Early Solar System irradiation quantified by linked vanadium and beryllium isotope variations in meteorites", "description": "X-ray emission in young stellar objects (YSOs) is orders of magnitude more intense than in main sequence stars1,2, suggestive of cosmic ray irradiation of surrounding accretion disks. Protoplanetary disk irradiation has been detected around YSOs by HERSCHEL3. In our solar system, short-lived 10Be (half-life = 1.39 My4), which cannot be produced by stellar nucleosynthesis, was discovered in the oldest solar system solids, the calcium-aluminium-rich inclusions (CAIs)5. The high 10Be abundance, as well as detection of other irradiation tracers6,7, suggest 10Be likely originates from cosmic ray irradiation caused by solar flares8. Nevertheless, the nature of these flares (gradual or impulsive), the target (gas or dust), and the duration and location of irradiation remain unknown. Here we use the vanadium isotopic composition, together with initial 10Be abundance to quantify irradiation conditions in the early Solar System9. For the initial 10Be abundances recorded in CAIs, 50V excesses of a few per mil relative to chondrites have been predicted10,11. We report 50V excesses in CAIs up to 4.4 per mil that co-vary with 10Be abundance. Their co-variation dictates that excess 50V and 10Be were synthesised through irradiation of refractory dust. Modelling of the production rate of 50V and 10Be demonstrates that the dust was exposed to solar cosmic rays produced by gradual flares for less than 300 years at about 0.1 au from the protoSun.", "keywords": ["FOS: Physical sciences", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "01 natural sciences", "7. Clean energy", "ALLENDE CAIS", "[SDU] Sciences of the Universe [physics]", "0103 physical sciences", "EARTH", ":SHORT-LIVED BE-10", "RICH", "EXTINCT RADIOACTIVITIES", "0105 earth and related environmental sciences", "Earth and Planetary Astrophysics (astro-ph.EP)", "ORIGIN", "FRACTIONATION", "Sun", "Vanadium", "COSMIC-RAYS", "13. Climate action", "Irradiation", "Solar System", "Beryllium", "REFRACTORY INCLUSIONS", "INITIAL ABUNDANCE", "Meteorites", "Astrophysics - Earth and Planetary Astrophysics"]}, "links": [{"href": "https://www.nature.com/articles/s41550-017-0055.pdf"}, {"href": "https://doi.org/10.1038/s41550-017-0055"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nature%20Astronomy", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/s41550-017-0055", "name": "item", "description": "10.1038/s41550-017-0055", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/s41550-017-0055"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-03-20T00:00:00Z"}}, {"id": "10.1038/srep44255", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:17:39Z", "type": "Journal Article", "created": "2017-03-09", "title": "Calcium isotope fractionation between aqueous compounds relevant to low-temperature geochemistry, biology and medicine", "description": "Abstract<p>Stable Ca isotopes are fractionated between bones, urine and blood of animals and between soils, roots and leaves of plants by &gt;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.</p>", "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": "10.3847/2041-8213/ab2044", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:20:42Z", "type": "Journal Article", "created": "2019-05-23", "title": "Timing and Origin of the Angrite Parent Body Inferred from Cr Isotopes", "description": "Abstract                <p>Angrite meteorites are some of the oldest materials in the solar system. They provide important information on the earliest evolution of the solar system and accretion timescales of protoplanets. Here, we show that the 54Cr/52Cr ratio is homogeneously distributed among angrite meteorites within 13 parts per million, indicating that precursor materials must have experienced a global-scale melting such as a magma ocean. The 53Cr/52Cr and Mn/Cr ratios are correlated, which is evidence for an initial 53Mn/55Mn ratio of (3.16\uffc2\uffa0\uffc2\uffb1\uffc2\uffa00.11)\uffc2\uffa0\uffc3\uff97\uffc2\uffa010\uffe2\uff88\uff926. When anchored to the U-corrected Pb\uffe2\uff80\uff93Pb age for the D\uffe2\uff80\uff99Orbigny angrite, this initial 53Mn/55Mn corresponds to an absolute age of 4563.2\uffc2\uffa0\uffc2\uffb1\uffc2\uffa00.3 Ma, i.e., 4.1\uffc2\uffa0\uffc2\uffb1\uffc2\uffa00.3 Ma after Ca\uffe2\uff80\uff93Al-rich inclusion-formation. This age is distinct from that of the volatile depletion events dated by the 87Sr/86Sr initial ratio and therefore must correspond to the age of crystallization of the magma ocean and crust formation of the angrite parent body (APB), which can also constrain a slightly bigger size of APB than that of Vesta. Furthermore, this age is similar to those obtained from internal isochrons of the oldest volcanic angrites that cooled rapidly at the surface of the parent body (with ages of 4564 \uffe2\uff88\uffbc 4563 Ma), while older than those obtained from plutonic angrites (4561 \uffe2\uff88\uffbc 4556 Ma) that cooled down slowly, located deeper within the parent body. This implies that cooling of the APB took at least \uffe2\uff88\uffbc8 Myr after its differentiation.</p>", "keywords": ["570", "[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]", "550", "meteoroids -nuclear reactions", "astrochemistry", "abundances", "nucleosynthesis", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "01 natural sciences", "520", "meteorites", "astrochemistry -meteorites", "meteorites", " meteors", " meteoroids", "nuclear reactions", " nucleosynthesis", " abundances", "13. Climate action", "meteors", "meteoroids", "nuclear reactions", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.3847/2041-8213/ab2044"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/The%20Astrophysical%20Journal%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3847/2041-8213/ab2044", "name": "item", "description": "10.3847/2041-8213/ab2044", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3847/2041-8213/ab2044"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-05-20T00:00:00Z"}}, {"id": "10.5194/bg-2-159-2005", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:08Z", "type": "Journal Article", "created": "2010-04-29", "description": "<p>Abstract. Extreme sensitivity of soil organic carbon (SOC) to climate and land use change warrants further research in different terrestrial ecosystems. The aim of this study was to investigate the link between aggregate and SOC dynamics in a chronosequence of three different land uses of a south Chilean Andisol: a second growth Nothofagus obliqua forest (SGFOR), a grassland (GRASS) and a Pinus radiata plantation (PINUS). Total carbon content of the 0-10cm soil layer was higher for GRASS (6.7 kg C m-2) than for PINUS (4.3 kg C m-2, while TC content of SGFOR (5.8 kg C m-2) was not significantly different from either one. High extractable oxalate and pyrophosphate Al concentrations (varying from 20.3-24.4 g kg-1, and 3.9-11.1 g kg-1, respectively) were found in all sites. In this study, SOC and aggregate dynamics were studied using size and density fractionation experiments of the SOC, \uffce\uffb413C and total carbon analysis of the different SOC fractions, and C mineralization experiments. The results showed that electrostatic sorption between and among amorphous Al components and clay minerals is mainly responsible for the formation of metal-humus-clay complexes and the stabilization of soil aggregates. The process of ligand exchange between SOC and Al would be of minor importance resulting in the absence of aggregate hierarchy in this soil type. Whole soil C mineralization rate constants were highest for SGFOR and PINUS, followed by GRASS (respectively 0.495, 0.266 and 0.196 g CO2-Cm-2d-1 for the top soil layer). In contrast, incubation experiments of isolated macro organic matter fractions gave opposite results, showing that the recalcitrance of the SOC decreased in another order: PINUS&gt;SGFOR&gt;GRASS. We deduced that electrostatic sorption processes and physical protection of SOC in soil aggregates were the main processes determining SOC stabilization. As a result, high aggregate carbon concentrations, varying from 148 till 48 g kg-1, were encountered for all land use sites. Al availability and electrostatic charges are dependent on pH, resulting in an important influence of soil pH on aggregate stability. Recalcitrance of the SOC did not appear to largely affect SOC stabilization. Statistical correlations between extractable amorphous Al contents, aggregate stability and C mineralization rate constants were encountered, supporting this hypothesis. Land use changes affected SOC dynamics and aggregate stability by modifying soil pH (and thus electrostatic charges and available Al content), root SOC input and management practices (such as ploughing and accompanying drying of the soil).                     </p>", "keywords": ["DECOMPOSITION", "NEW-ZEALAND", "DENSITY FRACTIONS", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "HUMIC-ACID", "Life", "QH501-531", "QH540-549.5", "2. Zero hunger", "QE1-996.5", "CULTIVATED SOILS", "Ecology", "[SDU.OCEAN] Sciences of the Universe [physics]/Ocean", " Atmosphere", "Geology", "LAND-USE CHANGE", "04 agricultural and veterinary sciences", "ALUMINUM", "15. Life on land", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "MACROORGANIC MATTER", "C SEQUESTRATION", "[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]", "Earth and Environmental Sciences", "FOREST SOILS", "[SDU.STU] Sciences of the Universe [physics]/Earth Sciences", "0401 agriculture", " forestry", " and fisheries"], "contacts": [{"organization": "Huygens, D., Boeckx, P., van Cleemput, O., Oyarz\u00fan, C., Godoy, R.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5194/bg-2-159-2005"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.5194/bg-2-159-2005", "name": "item", "description": "10.5194/bg-2-159-2005", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5194/bg-2-159-2005"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-06-24T00:00:00Z"}}, {"id": "10.5194/bg-2-175-2005", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:08Z", "type": "Journal Article", "created": "2010-04-29", "title": "Nitrous Oxide Fluxes And Nitrogen Cycling Along A Pasture Chronosequence In Central Amazonia, Brazil", "description": "<p>Abstract. We studied nitrous oxide (N2O) fluxes and soil nitrogen (N) cycling following forest conversion to pasture in the central Amazon near Santar\uffc3\uffa9m, Par\uffc3\uffa1, Brazil. Two undisturbed forest sites and 27 pasture sites of 0.5 to 60 years were sampled once each during wet and dry seasons. In addition to soil-atmosphere fluxes of N2O we measured 27 soil chemical, soil microbiological and soil physical variables.  Soil N2O fluxes were higher in the wet season than in the dry season. Fluxes of N2O from forest soils always exceeded fluxes from pasture soils and showed no consistent trend with pasture age. At our forest sites, nitrate was the dominant form of inorganic N both during wet and dry season. At our pasture sites nitrate generally dominated the inorganic N pools during the wet season and ammonium dominated during the dry season. Net mineralization and nitrification rates displayed large variations. During the dry season net immobilization of N was observed in some pastures. Compared to forest sites, young pasture sites (\uffe2\uff89\uffa42 years) had low microbial biomass N and protease activities. Protease activity and microbial biomass N peaked in pastures of intermediate age (4 to 8 years) followed by consistently lower values in older pasture (10 to 60 years). The C/N ratio of litter was low at the forest sites (~25) and rapidly increased with pasture age reaching values of 60\uffe2\uff80\uff9370 at pastures of 15 years and older.  Nitrous oxide emissions at our sites were controlled by C and N availability and soil aeration. Fluxes of N2O were negatively correlated to leaf litter C/N ratio, NH4+-N and the ratio of NO3--N to the sum of NO3--N + NH4+-N (indicators of N availability), and methane fluxes and bulk density (indicators of soil aeration status) during the wet season. During the dry season fluxes of N2O were positively correlated to microbial biomass N, \uffce\uffb2-glucosidase activity, total inorganic N stocks and NH4+-N. In our study region, pastures of all age emitted less N2O than old-growth forests, because of a progressive decline in N availability with pasture age combined with strongly anaerobic conditions in some pastures during the wet season.                         </p>", "keywords": ["2. Zero hunger", "QE1-996.5", "Ecology", "[SDU.OCEAN] Sciences of the Universe [physics]/Ocean", " Atmosphere", "577", "Geology", "04 agricultural and veterinary sciences", "15. Life on land", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "Life", "[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]", "13. Climate action", "QH501-531", "[SDU.STU] Sciences of the Universe [physics]/Earth Sciences", "0401 agriculture", " forestry", " and fisheries", "QH540-549.5"]}, "links": [{"href": "https://doi.org/10.5194/bg-2-175-2005"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.5194/bg-2-175-2005", "name": "item", "description": "10.5194/bg-2-175-2005", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5194/bg-2-175-2005"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-05-04T00:00:00Z"}}, {"id": "10.5194/bg-3-571-2006", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:09Z", "type": "Journal Article", "created": "2010-04-29", "description": "<p>Abstract. Eddy covariance technique to measure CO2, water and energy fluxes between biosphere and atmosphere is widely spread and used in various regional networks. Currently more than 250 eddy covariance sites are active around the world measuring carbon exchange at high temporal resolution for different biomes and climatic conditions. In this paper a new standardized set of corrections is introduced and the uncertainties associated with these corrections are assessed for eight different forest sites in Europe with a total of 12 yearly datasets. The uncertainties introduced on the two components GPP (Gross Primary Production) and TER (Terrestrial Ecosystem Respiration) are also discussed and a quantitative analysis presented. Through a factorial analysis we find that generally, uncertainties by different corrections are additive without interactions and that the heuristic u*-correction introduces the largest uncertainty. The results show that a standardized data processing is needed for an effective comparison across biomes and for underpinning inter-annual variability. The methodology presented in this paper has also been integrated in the European database of the eddy covariance measurements.                     </p>", "keywords": ["european database of the eddy covariance measurements", "550", "net ecosystem exchange", "Molecular Biology/Biochemistry [q-bio.BM]", "[SDU.STU]Sciences of the Universe [physics]/Earth Sciences", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]", "Life", "QH501-531", "[SDV.BBM.BC] Life Sciences [q-bio]/Biochemistry", " Molecular Biology/Biochemistry [q-bio.BM]", "QH540-549.5", "eddy covariance technique", "[SDU.OCEAN]Sciences of the Universe [physics]/Ocean", "QE1-996.5", "algorithm", "[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]", "Ecology", "Atmosphere", "[SDU.OCEAN] Sciences of the Universe [physics]/Ocean", " Atmosphere", "500", "Geology", "15. Life on land", "terrestrial ecosystem respiration", "gross primary production", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "[SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry", "[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]", "13. Climate action", "[SDU.STU] Sciences of the Universe [physics]/Earth Sciences", "co2", "measurement", "[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces", "environment"]}, "links": [{"href": "https://doi.org/10.5194/bg-3-571-2006"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.5194/bg-3-571-2006", "name": "item", "description": "10.5194/bg-3-571-2006", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5194/bg-3-571-2006"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2006-11-27T00:00:00Z"}}, {"id": "10.5194/bg-4-891-2007", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:09Z", "type": "Journal Article", "created": "2010-04-29", "description": "<p>Abstract. Ecosystems in dry regions are generally low in productivity and carbon (C) storage. We report, however, large increases in C sequestration following afforestation of a semi-arid shrubland with Pinus halepensis trees. Using C and nitrogen (N) inventories, based in part on site-specific allometric equations, we measured an increase in the standing ecosystem C stock from 2380 g C m\uffe2\uff88\uff922 in the shrubland to 5840 g C m\uffe2\uff88\uff922 in the forest after 35 years, with no significant change in N stocks. Carbon sequestration following afforestation was associated with increased N use efficiency as reflected by an overall increase in C/N ratio from 7.6 in the shrubland to 16.6 in the forest. The C accumulation rate in the forest was particularly high for soil organic C (SOC; increase of 1760 g C m\uffe2\uff88\uff922 or 50 g C m\uffe2\uff88\uff922 yr\uffe2\uff88\uff921), which was associated with the following factors: 1) Analysis of a small 13C signal within this pure C3 system combined with size fractionation of soil organic matter indicated a significant addition of new SOC derived from forest vegetation (68% of total forest SOC) and a considerable portion of the old original shrubland SOC (53%) still remaining in the forest. 2) A large part of both new and old SOC appeared to be protected from decomposition as about 60% of SOC under both land-use types were in mineral-associated fractions. 3) A short-term decomposition study indicated decreased decomposition of lower-quality litter and SOC in the forest, based on reduced decay rates of up to 90% for forest compared to shrubland litter. 4) Forest soil included a significant component of live and dead roots (12% of total SOC). Our results suggest a role for increased N use efficiency, enhanced SOC protection and reduced decomposition rates in the large C sequestration potential following afforestation in semi-arid regions. These results are particularly relevant in light of persistent predictions of drying trends in the Mediterranean and other regions.                     </p>", "keywords": ["0106 biological sciences", "2. Zero hunger", "QE1-996.5", "Ecology", "[SDU.OCEAN] Sciences of the Universe [physics]/Ocean", " Atmosphere", "Geology", "04 agricultural and veterinary sciences", "15. Life on land", "[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]", "01 natural sciences", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "Life", "[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]", "13. 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