{"type": "FeatureCollection", "features": [{"id": "10.1016/j.agrformet.2022.108823", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:15:18Z", "type": "Journal Article", "created": "2022-01-20", "title": "Timing leaf senescence : a generalized additive models for location, scale and shape approach", "description": "Accurate estimations of phenophases in deciduous trees are important to understand forest ecosystems and their feedback on the climate. In particular, the timing of leaf senescence is of fundamental importance to trees' nutrient stoichiometry and drought tolerance and therefore to trees' vigor and fecundity. Nevertheless, there is no integrated view on the significance, and direction, of seasonal trends in leaf senescence, especially for years characterized by extreme weather events. Difficulties in the acquisition and analyses of hierarchical data can account for this. We collected four years of chlorophyll content index (CCI) measurements in thirty-eight individuals of four deciduous tree species (Betula pendula, Fagus sylvatica, Populus tremula and Quercus robur) in Belgium, Norway and Spain, and analyzed these data using generalized additive models for location, scale and shape (GAMLSS). As a result, (I) the phenological strategy and seasonal trend of leaf senescence in these tree species could be clarified for exceptionally dry and warm years, and (II) the daily average (air) temperature, global radiation, and vapor pressure deficit could be established as main drivers behind the variation in the timing of the senescence transition date. Our results show that the onset of the re-organization phase in the leaf senescence, which we approximated and defined as local minima in the second derivative of a CCI graph, was in all species mainly negatively affected by the average temperature, global radiation and vapor pressure deficit. All together the variables explained 89 to 98% of the variability in the leaf senescence timing. An additional finding is that the generalized beta type 2 and generalized gamma distributions are well suited to model the chlorophyll content index, while the senescence transition date can be modeled using the normal-exponential-student-t, generalized gamma and zero-inflated Box-Cox Cole and Green distributions for beech, oak and birch, and poplar, respectively.", "keywords": ["0106 biological sciences", "Physics", "ta1183", "Silver birch", "15. Life on land", "01 natural sciences", "Generalized additive models for location", "Scale and shape", "European beech", "Pedunculate oak", "Chemistry", "Leaf senescence", "13. Climate action", "European aspen", "ta1181", "0101 mathematics", "Biology"]}, "links": [{"href": "https://doi.org/10.1016/j.agrformet.2022.108823"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agricultural%20and%20Forest%20Meteorology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.agrformet.2022.108823", "name": "item", "description": "10.1016/j.agrformet.2022.108823", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.agrformet.2022.108823"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-01T00:00:00Z"}}, {"id": "10.1007/pl00008869", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:14:15Z", "type": "Journal Article", "created": "2006-04-10", "title": "Combined Effects Of Atmospheric Co2 And N Availability On The Belowground Carbon And Nitrogen Dynamics Of Aspen Mesocosms", "description": "It is uncertain whether elevated atmospheric CO2 will increase C storage in terrestrial ecosystems without concomitant increases in plant access to N. Elevated CO2 may alter microbial activities that regulate soil N availability by changing the amount or composition of organic substrates produced by roots. Our objective was to determine the potential for elevated CO2 to change N availability in an experimental plant-soil system by affecting the acquisition of root-derived C by soil microbes. We grew Populus tremuloides (trembling aspen) cuttings for 2 years under two levels of atmospheric CO2 (36.7 and 71.5 Pa) and at two levels of soil N (210 and 970 \u00b5g N g-1). Ambient and twice-ambient CO2 concentrations were applied using open-top chambers, and soil N availability was manipulated by mixing soils differing in organic N content. From June to October of the second growing season, we measured midday rates of soil respiration. In August, we pulse-labeled plants with 14CO2 and measured soil 14CO2 respiration and the 14C contents of plants, soils, and microorganisms after a 6-day chase period. In conjunction with the August radio-labeling and again in October, we used 15N pool dilution techniques to measure in situ rates of gross N mineralization, N immobilization by microbes, and plant N uptake. At both levels of soil N availability, elevated CO2 significantly increased whole-plant and root biomass, and marginally increased whole-plant N capital. Significant increases in soil respiration were closely linked to increases in root biomass under elevated CO2. CO2 enrichment had no significant effect on the allometric distribution of biomass or 14C among plant components, total 14C allocation belowground, or cumulative (6-day) 14CO2 soil respiration. Elevated CO2 significantly increased microbial 14C contents, indicating greater availability of microbial substrates derived from roots. The near doubling of microbial 14C contents at elevated CO2 was a relatively small quantitative change in the belowground C cycle of our experimental system, but represents an ecologically significant effect on the dynamics of microbial growth. Rates of plant N uptake during both 6-day periods in August and October were significantly greater at elevated CO2, and were closely related to fine-root biomass. Gross N mineralization was not affected by elevated CO2. Despite significantly greater rates of N immobilization under elevated CO2, standing pools of microbial N were not affected by elevated CO2, suggesting that N was cycling through microbes more rapidly. Our results contained elements of both positive and negative feedback hypotheses, and may be most relevant to young, aggrading ecosystems, where soil resources are not yet fully exploited by plant roots. If the turnover of microbial N increases, higher rates of N immobilization may not decrease N availability to plants under elevated CO2.", "keywords": ["0106 biological sciences", "root-: biomass-", "Ecology and Evolutionary Biology", "nitrogen-fixation", "Environmental-Sciences)", "01 natural sciences", "nitrogen", "biomass-", "nitrogen-cycle", "nitrogen-", "Microorganisms-", "carbon-14", "124-38-9: CARBON DIOXIDE", "C Cycle", "Spermatophytes-", "Spermatophyta-", "Key Words Atmospheric CO2", "Cellular and Developmental Biology", "Populus Tremuloides Michx", "2. Zero hunger", "carbon-dioxide: atmospheric-", "plant-nutrition", "Climatology- (Environmental-Sciences)", "Angiosperms-", "Angiospermae-", "Plants-", "Natural Resources and Environment", "04 agricultural and veterinary sciences", "global-climate-change", "microbe- (Microorganisms-)", "7727-37-9: NITROGEN", "chemical-composition", "carbon-sequestration", "mineral-uptake", "soil-biology", "Science", "Vascular-Plants", "poplars-", "respiration-", "carbon-dioxide-enrichment", "carbon-dioxide", "Populus-tremuloides [trembling-aspen] (Salicaceae-)", "carbon-cycle", "Health Sciences", "Salicaceae-: Dicotyledones-", "soil-respiration", "content", "Plantae-", "14762-75-5: CARBON-14", "mineralization-", "Molecular", "forest-soils", "15. Life on land", "Rhizodeposition", "soil-flora", "N Cycle", "13. Climate action", "cuttings-", "roots-", "Legacy", "Terrestrial-Ecology (Ecology-", "0401 agriculture", " forestry", " and fisheries", "Dicots-", "ecosystems-"], "contacts": [{"organization": "Mikan, Carl J., Zak, Donald R., Kubiske, Mark E., Pregitzer, Kurt S.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/pl00008869"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/pl00008869", "name": "item", "description": "10.1007/pl00008869", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/pl00008869"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2000-08-23T00:00:00Z"}}, {"id": "10.1007/s00442-005-0191-4", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:14:24Z", "type": "Journal Article", "created": "2005-07-22", "title": "Fine Root Chemistry And Decomposition In Model Communities Of North-Temperate Tree Species Show Little Response To Elevated Atmospheric Co2 And Varying Soil Resource Availability", "description": "Rising atmospheric [CO2] has the potential to alter soil carbon (C) cycling by increasing the content of recalcitrant constituents in plant litter, thereby decreasing rates of decomposition. Because fine root turnover constitutes a large fraction of annual NPP, changes in fine root decomposition are especially important. These responses will likely be affected by soil resource availability and the life history characteristics of the dominant tree species. We evaluated the effects of elevated atmospheric [CO2] and soil resource availability on the production and chemistry, mycorrhizal colonization, and decomposition of fine roots in an early- and late-successional tree species that are economically and ecologically important in north temperate forests. Open-top chambers were used to expose young trembling aspen (Populus tremuloides) and sugar maple (Acer saccharum) trees to ambient (36 Pa) and elevated (56 Pa) atmospheric CO2. Soil resource availability was composed of two treatments that bracketed the range found in the Upper Lake States, USA. After 2.5 years of growth, sugar maple had greater fine root standing crop due to relatively greater allocation to fine roots (30% of total root biomass) relative to aspen (7% total root biomass). Relative to the low soil resources treatment, aspen fine root biomass increased 76% with increased soil resource availability, but only under elevated [CO2]. Sugar maple fine root biomass increased 26% with increased soil resource availability (relative to the low soil resources treatment), and showed little response to elevated [CO2]. Concentrations of N and soluble phenolics, and C/N ratio in roots were similar for the two species, but aspen had slightly higher lignin and lower condensed tannins contents compared to sugar maple. As predicted by source-sink models of carbon allocation, pooled constituents (C/N ratio, soluble phenolics) increased in response to increased relative carbon availability (elevated [CO2]/low soil resource availability), however, biosynthetically distinct compounds (lignin, starch, condensed tannins) did not always respond as predicted. We found that mycorrhizal colonization of fine roots was not strongly affected by atmospheric [CO2] or soil resource availability, as indicated by root ergosterol contents. Overall, absolute changes in root chemical composition in response to increases in C and soil resource availability were small and had no effect on soil fungal biomass or specific rates of fine root decomposition. We conclude that root contributions to soil carbon cycling will mainly be influenced by fine root production and turnover responses to rising atmospheric [CO2], rather than changes in substrate chemistry.", "keywords": ["0106 biological sciences", "Science", "Climate", "Ecology and Evolutionary Biology", "Plant Roots", "01 natural sciences", "Trees", "Sugar Maple", "Soil", "Ergosterol", "Health Sciences", "Carbon-based Secondary Compounds", "Biomass", "Cellular and Developmental Biology", "Ecosystem", "Soil Microbiology", "Atmosphere", "Fungi", "Natural Resources and Environment", "Molecular", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "Soil C Cycling", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Trembling Aspen"]}, "links": [{"href": "https://doi.org/10.1007/s00442-005-0191-4"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00442-005-0191-4", "name": "item", "description": "10.1007/s00442-005-0191-4", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00442-005-0191-4"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-07-23T00:00:00Z"}}, {"id": "10.1007/s004420100656", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:14:26Z", "type": "Journal Article", "created": "2003-02-13", "title": "Fine-Root Biomass And Fluxes Of Soil Carbon In Young Stands Of Paper Birch And Trembling Aspen As Affected By Elevated Atmospheric Co2 And Tropospheric O3", "description": "Rising atmospheric CO2 may stimulate future forest productivity, possibly increasing carbon storage in terrestrial ecosystems, but how tropospheric ozone will modify this response is unknown. Because of the importance of fine roots to the belowground C cycle, we monitored fine-root biomass and associated C fluxes in regenerating stands of trembling aspen, and mixed stands of trembling aspen and paper birch at FACTS-II, the Aspen FACE project in Rhinelander, Wisconsin. Free-air CO2 enrichment (FACE) was used to elevate concentrations of CO2 (average enrichment concentration 535\u00a0\u00b5l l-1) and O3 (53\u00a0nl l-1) in developing forest stands in 1998 and 1999. Soil respiration, soil pCO2, and dissolved organic carbon in soil solution (DOC) were monitored biweekly. Soil respiration was measured with a portable infrared gas analyzer. Soil pCO2 and DOC samples were collected from soil gas wells and tension lysimeters, respectively, at depths of 15, 30, and 125\u00a0cm. Fine-root biomass averaged 263\u00a0g m-2 in control plots and increased 96% under elevated CO2. The increased root biomass was accompanied by a 39% increase in soil respiration and a 27% increase in soil pCO2. Both soil respiration and pCO2 exhibited a strong seasonal signal, which was positively correlated with soil temperature. DOC concentrations in soil solution averaged ~12\u00a0mg l-1 in surface horizons, declined with depth, and were little affected by the treatments. A simplified belowground C budget for the site indicated that native soil organic matter still dominated the system, and that soil respiration was by far the largest flux. Ozone decreased the above responses to elevated CO2, but effects were rarely statistically significant. We conclude that regenerating stands of northern hardwoods have the potential for substantially greater C input to soil due to greater fine-root production under elevated CO2. Greater fine-root biomass will be accompanied by greater soil C efflux as soil respiration, but leaching losses of C will probably be unaffected.", "keywords": ["0106 biological sciences", "Ecology and Evolutionary Biology", "Aspen-FACE-project", "root-", "USA-", "pollutants-", "Environmental-Sciences)", "tropospheric-ozone", "forest-productivity", "01 natural sciences", "biomass-", "northern-forests", "124-38-9: CARBON DIOXIDE", "soil-carbon-flux", "terrestrial-ecosystems", "populus-tremuloides", "Cellular and Developmental Biology", "soil-carbon", "7440-44-0: CARBON", "carbon-", "fine-root", "Bioenergetics- (Biochemistry-and-Molecular-Biophysics)", "Natural Resources and Environment", "04 agricultural and veterinary sciences", "GLOBAL-ECOLOGY", "North-America", "Nearctic-region)", "Rhinelander- (Wisconsin-", "carbon-sequestration", "atmosphere-", "biomass-production", "dissolved-organic-carbon [DOC-]", "Science", "respiration-", "carbon-dioxide-enrichment", "forest-plantations", "carbon-dioxide", "carbon-storage", "fine-root-biomass", "belowground-biomass", "United-States-Wisconsin-Rhinelander", "carbon-cycle", "Health Sciences", "ozone-", "soil-respiration", "air-pollution", "global-change", "atmospheric-carbon-dioxide", "biomass", "Molecular", "15. Life on land", "ozone", "13. Climate action", "roots-", "Legacy", "Terrestrial-Ecology (Ecology-", "free-air-carbon-dioxide-enrichment [FREE-]: experimental-method", "0401 agriculture", " forestry", " and fisheries", "Northern Forests Global Change Carbon Sequestration Soil Respiration Dissolved Organic Carbon Soil PCO2"]}, "links": [{"href": "https://doi.org/10.1007/s004420100656"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s004420100656", "name": "item", "description": "10.1007/s004420100656", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s004420100656"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2001-07-01T00:00:00Z"}}, {"id": "10.1023/a:1004518730970", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:17:16Z", "type": "Journal Article", "created": "2002-12-21", "description": "Elevated atmospheric CO2 has the potential to change below-ground nutrient cycling and thereby alter the soil-atmosphere exchange of biogenic trace gases. We measured fluxes of CH4 and N2O in trembling aspen (Populus tremuloides Michx.) stands grown in open-top chambers under ambient and twice-ambient CO2 concentrations crossed with \u2018high\u2019 and low soil-N conditions.", "keywords": ["measurement-", "nitrous-oxide", "flux-", "Vascular-Plants", "poplars-", "carbon-dioxide-enrichment", "photosynthesis-", "Nutrition-", "carbon-dioxide: atmospheric-concentration", "stand-growth", "nitrogen-cycle", "michigan-", "methane-: flux-", "soil-", "nitrogen-", "Populus-tremuloides [aspen-] (Salicaceae-)", "carbon-cycle", "methane-production", "soil-fertility", "Salicaceae-: Dicotyledones-", "populus-tremuloides", "cycling-", "Spermatophytes-", "Spermatophyta-", "Plantae-", "biological-activity-in-soil", "Climatology- (Environmental-Sciences)", "Angiosperms-", "Angiospermae-", "Plants-", "gases-", "oxidation-", "forest-soils", "methane-", "04 agricultural and veterinary sciences", "GLOBAL-ECOLOGY", "15. Life on land", "enzyme-activity", "gas-exchange", "nitrous-oxide: emission-", "soil-water", "13. Climate action", "denitrification-", "0401 agriculture", " forestry", " and fisheries", "soil-bacteria", "Dicots-", "efflux-"]}, "links": [{"href": "https://doi.org/10.1023/a:1004518730970"}, {"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/a:1004518730970", "name": "item", "description": "10.1023/a:1004518730970", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/a:1004518730970"}, {"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": "10.1111/j.1365-2486.2007.01406.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:18:42Z", "type": "Journal Article", "created": "2007-08-28", "title": "The Legacy Of Harvest And Fire On Ecosystem Carbon Storage In A North Temperate Forest", "description": "Abstract<p>Forest harvesting and wildfire were widespread in the upper Great Lakes region of North America during the early 20th century. We examined how long this legacy of disturbance constrains forest carbon (C) storage rates by quantifying C pools and fluxes after harvest and fire in a mixed deciduous forest chronosequence in northern lower Michigan, USA. Study plots ranged in age from 6 to 68 years and were created following experimental clear\uffe2\uff80\uff90cut harvesting and fire disturbance. Annual C storage was estimated biometrically from measurements of wood, leaf, fine root, and woody debris mass, mass losses to herbivory, soil C content, and soil respiration. Maximum annual C storage in stands that were disturbed by harvest and fire twice was 26% less than a reference stand receiving the same disturbance only once. The mechanism for this reduction in annual C storage was a long\uffe2\uff80\uff90lasting decrease in site quality that endured over the 62\uffe2\uff80\uff90year timeframe examined. However, during regrowth the harvested and burned forest rapidly became a net C sink, storing 0.53\uffe2\uff80\uff83Mg\uffe2\uff80\uff83C\uffe2\uff80\uff83ha\uffe2\uff88\uff921\uffe2\uff80\uff83yr\uffe2\uff88\uff921after 6 years. Maximum net ecosystem production (1.35\uffe2\uff80\uff83Mg\uffe2\uff80\uff83C\uffe2\uff80\uff83ha\uffe2\uff88\uff921\uffe2\uff80\uff83yr\uffe2\uff88\uff921) and annual C increment (0.95\uffe2\uff80\uff83Mg\uffe2\uff80\uff83C\uffe2\uff80\uff83ha\uffe2\uff88\uff921\uffe2\uff80\uff83yr\uffe2\uff88\uff921) were recorded in the 24\uffe2\uff80\uff90 and 50\uffe2\uff80\uff90year\uffe2\uff80\uff90old stands, respectively. Net primary production averaged 5.19\uffe2\uff80\uff83Mg\uffe2\uff80\uff83C\uffe2\uff80\uff83ha\uffe2\uff88\uff921\uffe2\uff80\uff83yr\uffe2\uff88\uff921in experimental stands, increasing by &lt; 10% from 6 to 50 years. Soil heterotrophic respiration was more variable across stand ages, ranging from 3.85\uffe2\uff80\uff83Mg\uffe2\uff80\uff83C\uffe2\uff80\uff83ha\uffe2\uff88\uff921\uffe2\uff80\uff83yr\uffe2\uff88\uff921in the 6\uffe2\uff80\uff90year\uffe2\uff80\uff90old stand to 4.56\uffe2\uff80\uff83Mg\uffe2\uff80\uff83C\uffe2\uff80\uff83ha\uffe2\uff88\uff921\uffe2\uff80\uff83yr\uffe2\uff88\uff921in the 68\uffe2\uff80\uff90year\uffe2\uff80\uff90old stand. These results suggest that harvesting and fire disturbances broadly distributed across the region decades ago caused changes in site quality and successional status that continue to limit forest C storage rates.</p>", "keywords": ["disturbance", "570", "aspen", "net primary production", "net ecosystem production", "carbon storage", "15. Life on land", "01 natural sciences", "logging", "630", "succession", "northern hardwoods", "Biology", "fire", "legacy effects", "0105 earth and related environmental sciences"], "contacts": [{"organization": "Katherine H. Harrold, Christoph S. Vogel, Peter S. Curtis, Christopher M. Gough, Kristen George,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1111/j.1365-2486.2007.01406.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": "10.1111/j.1365-2486.2007.01406.x", "name": "item", "description": "10.1111/j.1365-2486.2007.01406.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1365-2486.2007.01406.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-07-17T00:00:00Z"}}, {"id": "10.1093/treephys/25.12.1511", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:18:16Z", "type": "Journal Article", "created": "2012-01-20", "title": "Effects Of Elevated Concentrations Of Atmospheric Co2 And Tropospheric O-3 On Leaf Litter Production And Chemistry In Trembling Aspen And Paper Birch Communities", "description": "Human activities are increasing the concentrations of atmospheric carbon dioxide ([CO2]) and tropospheric ozone ([O3]), potentially leading to changes in the quantity and chemical quality of leaf litter inputs to forest soils. Because the quality and quantity of labile and recalcitrant carbon (C) compounds influence forest productivity through changes in soil organic matter content, characterizing changes in leaf litter in response to environmental change is critical to understanding the effects of global change on forests. We assessed the independent and combined effects of elevated [CO2] and elevated [O3] on foliar litter production and chemistry in aspen (Populus tremuloides Michx.) and birch-(Betula papyrifera Marsh.) aspen communities at the Aspen free-air CO2 enrichment (FACE) experiment in Rhinelander, WI. Litter was analyzed for concentrations of C, nitrogen (N), soluble sugars, lipids, lignin, cellulose, hemicellulose and C-based defensive compounds (soluble phenolics and condensed tannins). Concentrations of these chemical compounds in naturally senesced litter were similar in aspen and birch-aspen communities among treatments, except for N, the C:N ratio and lipids. Elevated [CO2] significantly increased C:N (+8.7%), lowered mean litter N concentration (-10.7%) but had no effect on the concentrations of soluble sugars, soluble phenolics and condensed tannins. Elevated [CO2] significantly increased litter biomass production (+33.3%), resulting in significant increases in fluxes of N, soluble sugars, soluble phenolics and condensed tannins to the soil. Elevated [O3] significantly increased litter concentrations of soluble sugars (+78.1%), soluble phenolics (+53.1%) and condensed tannins (+77.2%). There were no significant effects of elevated [CO2] or elevated [O3] on the concentrations of individual C structural carbohydrates (cellulose, hemicellulose and lignin). Elevated [CO2] significantly increased cellulose (+37.4%) input to soil, whereas elevated [O3] significantly reduced hemicellulose and lignin inputs to soil (-22.3 and -31.5%, respectively). The small changes in litter chemistry in response to elevated [CO2] and tropospheric [O3] that we observed, combined with changes in litter biomass production, could significantly alter the inputs of N, soluble sugars, condensed tannins, soluble phenolics, cellulose and lignin to forest soils in the future.", "keywords": ["Nitrogen", "aspen", "carbon", "nutrient cycling", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "Carbon", "Plant Leaves", "ozone", "Soil", "Wisconsin", "Ozone", "Populus", "litter", "FACE", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "CO2", "leaves", "Biomass", "soils", "Forest Sciences", "Betula", "Ecosystem"], "contacts": [{"organization": "Liu, Lingli, King, John S., Giardina, Christian P.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1093/treephys/25.12.1511"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Tree%20Physiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/treephys/25.12.1511", "name": "item", "description": "10.1093/treephys/25.12.1511", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/treephys/25.12.1511"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-12-01T00:00:00Z"}}, {"id": "10.1046/j.1365-2486.2001.00388.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:17:43Z", "type": "Journal Article", "created": "2003-03-11", "title": "Chemistry And Decomposition Of Litter From Populus Tremuloides Michaux Grown At Elevated Atmospheric Co2 And Varying N Availability", "description": "Summary<p>It has been hypothesized that greater production of total nonstructural carbohydrates (TNC) in foliage grown under elevated atmospheric carbon dioxide (CO2) will result in higher concentrations of defensive compounds in tree leaf litter, possibly leading to reduced rates of decomposition and nutrient cycling in forest ecosystems of the future. To evaluate the effects of elevated atmospheric CO2on litter chemistry and decomposition, we performed a 111 day laboratory incubation with leaf litter of trembling aspen (Populus tremuloidesMichaux) produced at 36\uffe2\uff80\uff83Pa and 56\uffe2\uff80\uff83Pa CO2and two levels of soil nitrogen (N) availability. Decomposition was quantified as microbially respired CO2and dissolved organic carbon (DOC) in soil solution, and concentrations of nonstructural carbohydrates, N, carbon (C), and condensed tannins were monitored throughout the incubation. Growth under elevated atmospheric CO2did not significantly affect initial litter concentrations of TNC, N, or condensed tannins. Rates of decomposition, measured as both microbially respired CO2and DOC did not differ between litter produced under ambient and elevated CO2. Total C lost from the samples was 38\uffe2\uff80\uff83mg\uffe2\uff80\uff83g\uffe2\uff88\uff921litter as respired CO2and 138\uffe2\uff80\uff83mg\uffe2\uff80\uff83g\uffe2\uff88\uff921litter as DOC, suggesting short\uffe2\uff80\uff90term pulses of dissolved C in soil solution are important components of the terrestrial C cycle. We conclude that litter chemistry and decomposition in trembling aspen are minimally affected by growth under higher concentrations of CO2.</p>", "keywords": ["Ecology and Evolutionary Biology", "carbohydrates", "Quaking aspen", "forest-soil", "litter-plant", "nitrogen", "nitrogen-", "Microlysimeter", "soil-chemistry", "cycling-", "populus-tremuloides", "Geology and Earth Sciences", "Soil Carbon", "Microbiology of soils", "Carbon cycle", "04 agricultural and veterinary sciences", "GLOBAL-ECOLOGY", "chemical-composition", "Organic-matter", "soil-solution", "nutrient-availability", "Tannin", "leaf-litter", "Science", "decomposition-", "Nutrient enrichment", "Carbohydrates", "carbohydrates-", "respiration-", "carbon-dioxide-enrichment", "Nitrogen in soil", "michigan-", "carbon sinks", "C", "Nutrient budget of forests", "Litter", "Populus tremuloides", "Global Change", "tannins-", "Decomposition", "forest-litter", "Foliage", "Carbon dioxide effects on forest litter", "Climatic changes", "15. Life on land", "carbon-nitrogen-ratio", "Forest litter decomposition", "N Ratio", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "microbial-activities", "nitrogen-content"]}, "links": [{"href": "https://doi.org/10.1046/j.1365-2486.2001.00388.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.1365-2486.2001.00388.x", "name": "item", "description": "10.1046/j.1365-2486.2001.00388.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1046/j.1365-2486.2001.00388.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2001-01-01T00:00:00Z"}}, {"id": "10.1093/treephys/22.7.435", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:18:15Z", "type": "Journal Article", "created": "2012-01-20", "title": "Responses Of Deciduous Broadleaf Trees To Defoliation In A Co2 Enriched Atmosphere", "description": "Relatively little is known about the implications of atmospheric CO2 enrichment for tree responses to biotic disturbances such as folivory. We examined the combined effects of elevated CO2 concentration ([CO2]) and defoliation on growth and physiology of sugar maple (Acer saccharum Marsh.) and trembling aspen (Populus tremuloides Michx.). Seedlings were planted in the ground in eight open-top chambers. Four chambers were ventilated with CO2-enriched air (ambient + 283 micromol mol-1) and four chambers were supplied with ambient air. After 6 weeks of growth, half of the leaf area was removed on a subset of seedlings of each species in each CO2 treatment. We monitored subsequent biomass gain and allocation, along with leaf gas exchange and chemistry. Defoliation did not significantly affect final seedling biomass in either species or CO2 treatment. Growth recovery following defoliation was associated with increased allocation to leaf mass in maple and a slight enhancement of mean photosynthesis in aspen. Elevated [CO2] did not significantly affect aspen growth, and the observed stimulation of maple growth was significant only in mid-season. Correspondingly, simulated responses of whole-tree photosynthesis to elevated [CO2] were constrained by a decrease in photosynthetic capacity in maple, and were partially offset by reductions in specific leaf area and biomass allocation to foliage in aspen. There was a significant interaction between [CO2] and defoliation on only a few of the measured traits. Thus, the data do not support the hypothesis that atmospheric CO2 enrichment will substantially alter tree responses to folivory. However, our findings do provide further indication that regeneration-stage growth rates of certain temperate tree species may respond only moderately to a near doubling of atmospheric [CO2].", "keywords": ["defoliation-", "0106 biological sciences", "Ecophysiology", "Quaking aspen", "biomass-allocation", "growth-response", "Growth", "Environmental-Sciences)", "01 natural sciences", "plant-composition", "Trees", "biomass-", "Spermatophyta-", "Biomass", "Photosynthesis", "plant-physiology", "defoliation", "Angiospermae-", "leaf-area", "GLOBAL-ECOLOGY", "seedling-growth", "source-sink-relations", "Populus-tremuloides", "gas-exchange", "Populus", "broadleaves-", "deciduous-tree", "forest-trees", "atmosphere-", "trees-", "biomass-production", "Acer saccharum", "Nitrogen", "Carbohydrates", "Acer", "carbon-dioxide-enrichment", "photosynthesis-", "growth-", "species-differences", "seedlings-", "wisconsin-", "Populus tremuloides", "photosynthesis", "Climatic changes", "Carbon Dioxide", "15. Life on land", "Plant Leaves", "leaves-", "Aceraceae-: Dicotyledones-", "Carbon dioxide", "Sugar maple", "Seedlings", "Terrestrial-Ecology (Ecology-", "Acer-saccharum"], "contacts": [{"organization": "Volin, John C., Kruger, Eric L., Lindroth, Richard L.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1093/treephys/22.7.435"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Tree%20Physiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/treephys/22.7.435", "name": "item", "description": "10.1093/treephys/22.7.435", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/treephys/22.7.435"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2002-05-01T00:00:00Z"}}, {"id": "10.1093/treephys/tpaa058", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:18:16Z", "type": "Journal Article", "created": "2020-04-24", "title": "Timeline of autumn phenology in temperate deciduous trees", "description": "Abstract                <p>Cessation of xylem formation or wood growth (CWG) and onset of foliar senescence (OFS) are key autumn phenological events in temperate deciduous trees. Their timing is fundamental for the development and survival of trees, ecosystem nutrient cycling and the seasonal exchange of matter and energy between the biosphere and atmosphere, and affects the impact and feedback of forests to global change. A large-scale experimental effort and improved observational methods have allowed us to compare the timing of CWG and OFS for different deciduous tree species in Western Europe, particularly in silver birch, a pioneer species, and European beech, a late-succession species, at stands of different latitudes, of different levels of site fertility, for 2 years with contrasting meteorological and drought conditions, i.e., the low moderately dry 2017 and the extremely dry 2018. Specifically, we tested whether foliar senescence started before, after or concurrently with CWG. Onset of foliar senescence and CWG occurred generally between late September and early November, with larger differences across species and sites for OFS. Foliar senescence started concurrently with CWG in most cases, except for the drier 2018 and, for beech, at the coldest site, where OFS occurred significantly later than CWG. The behavior of beech in Spain, the southern edge of its European distribution, was unclear, with no CWG, but very low wood growth at the time of OFS. Our study suggests that OFS is generally triggered by the same drivers of CWG or when wood growth decreases in late summer, indicating an overarching mechanism of sink limitation as a possible regulator of the timing of foliar senescence.</p>", "keywords": ["0106 biological sciences", "listna senescenca", "nastajanje lesa", "cambium", "info:eu-repo/classification/udc/630*18:630*8", "autumn phenology", " xylem formation", " foliar senescence", " cambium", " chlorophyll", " radial growth", " wood", " decidiuous trees", " common aspen", " common beech", " pedunculate oak", " silver birch", "01 natural sciences", "jesenska fenologija", " nastajanje lesa", " listna senescenca", " kambij", " klorofil", " debelinska rast", " les", " listavci", " trepetlika", " navadna bukev", " dob", " navadna breza", "trepetlika", "Trees", "navadna bukev", "klorofil", "les", "chlorophyll", "pedunculate oak", "Biology", "info:eu-repo/classification/udc/630*1", "Ecosystem", "xylem formation", "kambij", "silver birch", "Temperature", "sink limitation", "04 agricultural and veterinary sciences", "dob", "navadna breza", "15. Life on land", "debelinska rast", "common beech", "listavci", "[SDE.BE] Environmental Sciences/Biodiversity and Ecology", "Europe", "Plant Leaves", "radial growth", "jesenska fenologija", "common aspen", "Spain", "13. Climate action", "foliar senescence", "wood growth", "0401 agriculture", " forestry", " and fisheries", "Seasons", "[SDE.BE]Environmental Sciences/Biodiversity and Ecology", "autumn phenology", "decidiuous trees", "wood"]}, "links": [{"href": "https://doi.org/10.1093/treephys/tpaa058"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Tree%20Physiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/treephys/tpaa058", "name": "item", "description": "10.1093/treephys/tpaa058", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/treephys/tpaa058"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-04-27T00:00:00Z"}}, {"id": "10.1111/j.1469-8137.2005.01557.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:18:49Z", "type": "Journal Article", "created": "2005-09-02", "title": "Tropospheric O3 Compromises Net Primary Production In Young Stands Of Trembling Aspen, Paper Birch And Sugar Maple In Response To Elevated Atmospheric Co2", "description": "Concentrations of atmospheric CO(2) and tropospheric ozone (O(3)) are rising concurrently in the atmosphere, with potentially antagonistic effects on forest net primary production (NPP) and implications for terrestrial carbon sequestration. Using free-air CO(2) enrichment (FACE) technology, we exposed north-temperate forest communities to concentrations of CO(2) and O(3) predicted for the year 2050 for the first 7 yr of stand development. Site-specific allometric equations were applied to annual nondestructive growth measurements to estimate above- and below-ground biomass and NPP for each year of the experiment. Relative to the control, elevated CO(2) increased total biomass 25, 45 and 60% in the aspen, aspen-birch and aspen-maple communities, respectively. Tropospheric O(3) caused 23, 13 and 14% reductions in total biomass relative to the control in the respective communities. Combined fumigation resulted in total biomass response of -7.8, +8.4 and +24.3% relative to the control in the aspen, aspen-birch and aspen-sugar maple communities, respectively. These results indicate that exposure to even moderate levels of O(3) significantly reduce the capacity of NPP to respond to elevated CO(2) in some forests.", "keywords": ["0106 biological sciences", "aspen", "carbon dioxide", "Acer", "Carbon Dioxide", "15. Life on land", "Wood", "01 natural sciences", "Carbon", "Plant Leaves", "ozone", "Wisconsin", "Ozone", "Populus", "13. Climate action", "pollution", "Biomass", "Forest Sciences", "global change", "Betula", "0105 earth and related environmental sciences"], "contacts": [{"organization": "Kurt S. Pregitzer, Mark E. Kubiske, David F. Karnosky, George R. Hendrey, John S. King, John S. King, Christian P. Giardina, Vanessa S. Quinn, Evan P. McDonald,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1111/j.1469-8137.2005.01557.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/New%20Phytologist", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1469-8137.2005.01557.x", "name": "item", "description": "10.1111/j.1469-8137.2005.01557.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1469-8137.2005.01557.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-09-02T00:00:00Z"}}, {"id": "10.1111/j.1461-0248.2009.01380.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:18:48Z", "type": "Journal Article", "created": "2009-09-15", "title": "Species-Specific Responses To Atmospheric Carbon Dioxide And Tropospheric Ozone Mediate Changes In Soil Carbon", "description": "Abstract<p>We repeatedly sampled the surface mineral soil (0\uffe2\uff80\uff9320\uffe2\uff80\uff83cm depth) in three northern temperate forest communities over an 11\uffe2\uff80\uff90year experimental fumigation to understand the effects of elevated carbon dioxide (CO2) and/or elevated phyto\uffe2\uff80\uff90toxic ozone (O3) on soil carbon (C). After 11\uffe2\uff80\uff83years, there was no significant main effect of CO2 or O3 on soil C. However, within the community containing only aspen (Populus tremuloides Michx.), elevated CO2 caused a significant decrease in soil C content. Together with the observations of increased litter inputs, this result strongly suggests accelerated decomposition under elevated CO2. In addition, an initial reduction in the formation of new (fumigation\uffe2\uff80\uff90derived) soil C by O3 under elevated CO2 proved to be only a temporary effect, mirroring trends in fine root biomass. Our results contradict predictions of increased soil C under elevated CO2 and decreased soil C under elevated O3 and should be considered in models simulating the effects of Earth\uffe2\uff80\uff99s altered atmosphere.</p>", "keywords": ["Decomposition", "Science", "Climate Change", "Aspen", "Ecology and Evolutionary Biology", "13 C", "Carbon Storage", "04 agricultural and veterinary sciences", "Carbon Dioxide", "Models", " Theoretical", "15. Life on land", "Carbon", "Trees", "Soil", "Ozone", "Populus", "Long-term", "Species Specificity", "13. Climate action", "Northern Temperate Forests", "0401 agriculture", " forestry", " and fisheries", "Global Change", "Environmental Monitoring"]}, "links": [{"href": "https://doi.org/10.1111/j.1461-0248.2009.01380.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecology%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1461-0248.2009.01380.x", "name": "item", "description": "10.1111/j.1461-0248.2009.01380.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1461-0248.2009.01380.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-10-13T00:00:00Z"}}, {"id": "10.1139/x92-146", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:19:07Z", "type": "Journal Article", "created": "2009-12-18", "title": "Carbon Storage In Lake States Aspen Ecosystems", "description": "<p> Total ecosystem carbon in the soil and vegetation was measured for a range of aspen (Populustremuloides Michx.) ecosystems, including a chronosequence on the same soil ranging in age from 0 to 80 years. Soil carbon stayed relatively constant throughout the stand's life and was not affected by timber harvesting. Changes in ecosystem carbon closely paralleled the changes in standing biomass. Aspen grown on 40-year rotations on good soils will sequester several times as much carbon per year as old-growth forests. </p>", "keywords": ["Management Options", "0106 biological sciences", "Michigan", "Spermatophyta", "Angiosperms", "Broadleaves", "wisconsin", "aspen", "Minnesota", "01 natural sciences", "Dicots", "forest succession", "Spermatophytes", "Populus tremuloides", "Biomass", "Plantae", "Forest Sciences", "USA", "Vascular Plants", "Salicaceae: Dicotyledones", "carbon", "Rotation Length", "age of trees", "Forestry", "Carbon cycle", "plant succession", "Plants", "Timber Harvest", "forest ecosystem", "carbon storage", "15. Life on land", "Angiospermae", "Chronosequence Soil Carbon", "ecosystems"], "contacts": [{"organization": "Alban, David H., Perala, D.A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1139/x92-146"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Canadian%20Journal%20of%20Forest%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1139/x92-146", "name": "item", "description": "10.1139/x92-146", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1139/x92-146"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1992-08-01T00:00:00Z"}}, {"id": "10.2307/1940889", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:20:18Z", "type": "Journal Article", "created": "2006-05-09", "title": "Effects Of Invasion Of An Aspen Forest (Canada) By Dendrobaena-Octaedra (Lumbricidae) On Plant-Growth", "description": "<p>Effects of invasion of an aspen forest in the Canadian Rocky Mountains by the earthworm Dendrobaena octaedra (Savigny) on nutrient mineralization, soil microflora, and plant growth were investigated during the growth period of 1992. Experimental chambers with reconstructed forest floor were placed in the field and destructively sampled after 7 and 14 wk. D. octaedra enhanced the shoot biomass of the grass Agropyron trachycaulum (Link) Malte (Poaceae) and increased the shoot\uffe2\uff80\uff94to\uffe2\uff80\uff94root ratio during early plant growth. Microbial biomass, basal respiration and respiratory quotient qCO2 in L/F layer material were reduced by D. octaedra but increased in the H layer. The nutrient (NH4+, NO3\uffe2\uff80\uff94, PO43\uffe2\uff80\uff94) content in soil was also affected by D. octaedra but the effects were small. Effects of the earthworms on soil nutrient content were masked by the great variation in the data and by leaching of nutrients from experimental chambers.</p>", "keywords": ["roots", "microbes and plants", "soil chemistry", "growth", "populus", "microflora and plants", "Invasion effects on nutrients", "Alberta", "forest soils", "microflora and plants in aspen forest", "Dendrobaena octaedra (Oligochaeta): Element cycles", "Forest and woodland", "nutrients", "biomass production", "Invasion consequences for ecosystem processes in forest soils", "impacts of invasion in aspen forest soils", "mineralization", "Annelids", "effects", "invasion impacts on ecosystem processes", "forests", "2. Zero hunger", "plant morphology", "effects on nutrients", "biomass", "soil fertility", "grasslands", "Habitat colonization", "KananaskisValley", "woodland grasslands", "Dispersal", "04 agricultural and veterinary sciences", "15. Life on land", "invasion", "Invasion of aspen forest soils effects on nutrients", "Invertebrates", "soil biology", "introduced species", "Soil habitat", "Aspen forest soils", "Nutrient mineralization", "0401 agriculture", " forestry", " and fisheries", "dendrobaena", "Impact on habitat", "root shoot ratio", "elymus trachycaulus", "soil fauna", "forest trees", "shoots"], "contacts": [{"organization": "Scheu, Stefan, Parkinson, Dennis,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.2307/1940889"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2307/1940889", "name": "item", "description": "10.2307/1940889", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2307/1940889"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1994-12-01T00:00:00Z"}}, {"id": "10.2307/2656979", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:20:19Z", "type": "Journal Article", "created": "2006-04-21", "title": "Genotypic Variation For Condensed Tannin Production In Trembling Aspen (Populs Tremuloides, Salicaceae) Under Elevated Co2 And In High- And Low-Fertility Soil", "description": "<p>The carbon/nutrient balance hypothesis suggests that leaf carbon to nitrogen ratios influence the synthesis of secondary compounds such as condensed tannins. We studied the effects of rising atmospheric carbon dioxide on carbon to nitrogen ratios and tannin production. Six genotypes of Populus tremuloides were grown under elevated and ambient CO2 partial pressure and high\uffe2\uff80\uff90 and low\uffe2\uff80\uff90fertility soil in field open\uffe2\uff80\uff90top chambers in northern lower Michigan, USA. During the second year of exposure, leaves were harvested three times (June, August, and September) and analyzed for condensed tannin concentration. The carbon/nutrient balance hypothesis was supported overall, with significantly greater leaf tannin concentration at high CO2 and low soil fertility compared to ambient CO2 and high soil fertility. However, some genotypes increased tannin concentration at elevated compared to ambient CO2, while others showed no CO2 response. Performance of lepidopteran leaf miner (Phyllonorycter tremuloidiella) larvae feeding on these plants varied across genotypes, CO2, and fertility treatments. These results suggest that with rising atmospheric CO2, plant secondary compound production may vary within species. This could have consequences for plant\uffe2\uff80\uff93herbivore and plant\uffe2\uff80\uff93microbe interactions and for the evolutionary response of this species to global climate change.</p>", "keywords": ["0106 biological sciences", "Salicaceae", "genotype", "plant\u2013herbivore interaction", "Phyllonorycter-tremuloidiella", "Quaking aspen", "01 natural sciences", "plant-composition", "tannin", "nitrogen-", "carbon-dioxide: elevation-", "124-38-9: CARBON DIOXIDE", "Spermatophytes-", "Spermatophyta-", "genotypic-variation", "Population-Genetics (Population-Studies)", "2. Zero hunger", "carbon-", "Climatology- (Environmental-Sciences)", "Angiosperms-", "Angiospermae-", "Plants-", "GLOBAL-ECOLOGY", "Populus-tremuloides", "plant-pests", "climate-change", "genetic-variation", "forest-trees", "condensed tannins", "Nitrogen", "Science", "Vascular-Plants", "carbon-dioxide-enrichment", "Nutrition-", "genotypes-", "Phyllonorycter tremuloidiella", "Populus-tremuloides [trembling-aspen] (Salicaceae-)", "soil-fertility", "Populus tremuloides", "Salicaceae-: Dicotyledones-", "Biology", "Plantae-", "global change", "tannins-", "condensed-tannin: production-", "foliage-", "forest-pests", "Tannic acid", "Metabolism-", "Botany", "carbon dioxide", "forest-soils", "15. Life on land", "Carbon", "climate-", "Carbon dioxide", "13. Climate action", "Dicots-", "insect-pests"], "contacts": [{"organization": "Donald R. Zak, Jennifer L Mansfield, Kurt S. Pregitzer, Kurt S. Pregitzer, Peter S. Curtis, Peter S. Curtis,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.2307/2656979"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/American%20Journal%20of%20Botany", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2307/2656979", "name": "item", "description": "10.2307/2656979", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2307/2656979"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1999-08-01T00:00:00Z"}}, {"id": "10.3390/f12121810", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:20:45Z", "type": "Journal Article", "created": "2021-12-21", "title": "Climate Benefit of Different Tree Species on Former Agricultural Land in Northern Europe", "description": "<p>The new European Union Forest Strategy for 2030 aims to plant an additional 3 billion trees on non-forest land to mitigate climate change. However, the choice of tree species for afforestation to achieve the maximum climate benefit is unclear. We compared the climate benefit of six different species in terms of carbon (C) sequestration in biomass and the harvested wood substitution in products to avoid carbon dioxide (CO2) emissions from fossil-based materials over the 100-year period by afforesting about \uffc2\uffbc of the available area in northern Europe. The highest climate benefit was observed for larch, both at a stand scale (1626 Mg CO2 eqv. ha\uffe2\uff88\uff921) and at the landscape level for the studied scenario (579 million Mg CO2 eqv.). Larch was followed by Norway spruce, poplar, hybrid aspen and birch, showing a climate benefit about 40\uffe2\uff80\uff9350% lower than that for larch. The climate benefit of willow was about 70% lower than larch. Willow showed 6\uffe2\uff80\uff9314-fold lower C stocks at the landscape level after 100 years than other tree species. The major climate benefit over the 100-year period comes from wood substitution and avoided emissions, but C stock buildup at the landscape level also removes significant amounts of CO2 already present in the atmosphere. The choice of tree species is important to maximize climate change mitigation.</p>", "keywords": ["Climate Research", "forest carbon; climate change; carbon substitution; willow; poplar; hybrid aspen; Norway spruce; silver birch; larch", "Forest Science"]}, "links": [{"href": "http://www.mdpi.com/1999-4907/12/12/1810/pdf"}, {"href": "https://pub.epsilon.slu.se/26950/1/lutter_r_et_al_220124.pdf"}, {"href": "https://www.mdpi.com/1999-4907/12/12/1810/pdf"}, {"href": "https://doi.org/10.3390/f12121810"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Forests", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/f12121810", "name": "item", "description": "10.3390/f12121810", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/f12121810"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-12-20T00:00:00Z"}}, {"id": "10.4141/s98-081", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:21:15Z", "type": "Journal Article", "created": "2011-04-23", "title": "Effects Of Forest Soil Compaction And Organic Matter Removal On Leaf Litter Decomposition In Central British Columbia", "description": "<p> As part of the long-term soil productivity study in central British Columbia, we examined the effect of soil compaction and organic matter removal on trembling aspen (Populus tremuloides Michx.) litter decomposition. We compared three levels of organic matter removal (stem-only, whole-tree harvest, and scalped mineral soil) and two levels of compaction (no compaction and heavy compaction) in a factorial design replicated as blocks on three sites. Whole-tree harvesting significantly increased litter decomposition rates compared to stem-only (by 36%) and scalped (by 41%) treatments. Soil compaction had inconsistent effects on decomposition rates (k) for forest floor and scalped treatments and, overall, did not significantly affect litter decomposition rates. Litter on scalped plots had higher rates of nutrient translocation than litter on forest floors. We found the treatments altered soil heat sums, so changes in temperatures at the soil surface might be partly responsible for the changes in decomposition rates. We could not detect differences in soil mesofauna populations collected from the litter bags, so treatment effects on fauna probably had less influence than microclimate on decomposition rates. The effects of these early changes in litter decomposition on biological productivity will be part of the ongoing long-term soil productivity study. Key words: Litter decomposition, soil compaction, scalping, whole-tree harvest, nutrient translocation </p>", "keywords": ["0106 biological sciences", "leaf-litter-decomposition: organic-matter-removal", "nutrients-", "Environmental-Sciences)", "01 natural sciences", "harvesting-", "translocation-", "populus-tremuloides", "soil-organic-matter", "Spermatophytes-", "Spermatophyta-", "Angiosperms-", "Angiospermae-", "Plants-", "heat-sums", "04 agricultural and veterinary sciences", "Soil-Science", "British-Columbia (Canada-", "North-America", "Nearctic-region)", "compaction-", "soil-compaction", "decomposition-", "microclimate-", "Vascular-Plants", "poplars-", "forests-", "movement-in-soil", "treatment-", "sustainability-", "Populus-tremuloides [trembling-aspen] (Salicaceae-)", "british-columbia", "Salicaceae-: Dicotyledones-", "land-productivity", "organic-matter", "Plantae-", "forest-litter", "productivity-", "forestry-practices", "forestry-", "mineralization-", "forest-soils", "mineral-soils", "removal-", "15. Life on land", "logging-effects", "Terrestrial-Ecology (Ecology-", "0401 agriculture", " forestry", " and fisheries", "Dicots-", "temperature-", "soil-fauna"], "contacts": [{"organization": "Kranabetter, J.M., Chapman, B.K.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.4141/s98-081"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Canadian%20Journal%20of%20Soil%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.4141/s98-081", "name": "item", "description": "10.4141/s98-081", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.4141/s98-081"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1999-11-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=aspen&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=aspen&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": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=aspen&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=aspen&offset=17", "hreflang": "en-US"}], "numberMatched": 17, "numberReturned": 17, "distributedFeatures": [], "timeStamp": "2026-07-27T08:59:02.297525Z"}