{"type": "FeatureCollection", "facets": {"type": {"type": "terms", "property": "type", "buckets": [{"value": "Journal Article", "count": 2}]}, "soil_chemical_properties": {"type": "terms", "property": "soil_chemical_properties", "buckets": [{"value": "soil organic matter", "count": 1}]}, "soil_biological_properties": {"type": "terms", "property": "soil_biological_properties", "buckets": []}, "soil_physical_properties": {"type": "terms", "property": "soil_physical_properties", "buckets": []}, "soil_classification": {"type": "terms", "property": "soil_classification", "buckets": []}, "soil_functions": {"type": "terms", "property": "soil_functions", "buckets": []}, "soil_threats": {"type": "terms", "property": "soil_threats", "buckets": [{"value": "soil physical degradation", "count": 2}]}, "soil_processes": {"type": "terms", "property": "soil_processes", "buckets": []}, "soil_management": {"type": "terms", "property": "soil_management", "buckets": []}, "ecosystem_services": {"type": "terms", "property": "ecosystem_services", "buckets": []}}, "features": [{"id": "10.1007/s10021-009-9288-7", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-04-04T16:14:48Z", "type": "Journal Article", "created": "2009-10-16", "title": "Soil Carbon Turnover Measurement By Physical Fractionation At A Forest-To-Pasture Chronosequence In The Brazilian Amazon", "description": "The effect of conversion from forest-to-pasture upon soil carbon stocks has been intensively discussed, but few studies focus on how this land-use change affects carbon (C) distribution across soil fractions in the Amazon basin. We investigated this in the 20\u00a0cm depth along a chronosequence of sites from native forest to three successively older pastures. We performed a physicochemical fractionation of bulk soil samples to better understand the mechanisms by which soil C is stabilized and evaluate the contribution of each C fraction to total soil C. Additionally, we used a two-pool model to estimate the mean residence time (MRT) for the slow and active pool C in each fraction. Soil C increased with conversion from forest-to-pasture in the particulate organic matter (>250\u00a0\u03bcm), microaggregate (53\u2013250\u00a0\u03bcm), and d-clay (<2\u00a0\u03bcm) fractions. The microaggregate comprised the highest soil C content after the conversion from forest-to-pasture. The C content of the d-silt fraction decreased with time since conversion to pasture. Forest-derived C remained in all fractions with the highest concentration in the finest fractions, with the largest proportion of forest-derived soil C associated with clay minerals. Results from this work indicate that microaggregate formation is sensitive to changes in management and might serve as an indicator for management-induced soil carbon changes, and the soil C changes in the fractions are dependent on soil texture.", "keywords": ["2. Zero hunger", "tropical land-use change", "soil physical fractionation", "deforestation", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "soil carbon", "15. Life on land"]}, "links": [{"href": "https://eprints.qut.edu.au/37758/1/lisb7891.pdf"}, {"href": "https://doi.org/10.1007/s10021-009-9288-7"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10021-009-9288-7", "name": "item", "description": "10.1007/s10021-009-9288-7", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10021-009-9288-7"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-10-17T00:00:00Z"}}, {"id": "10.1111/j.1475-2743.2011.00341.x", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-04-04T16:19:18Z", "type": "Journal Article", "created": "2011-04-16", "title": "Land-Use Effects On The Distribution Of Soil Organic Carbon Within Particle-Size Fractions Of Volcanic Soils In The Transmexican Volcanic Belt (Mexico)", "description": "Abstract<p>The aim of this study was to determine the effect of land\uffe2\uff80\uff90use and forest cover depletion on the distribution of soil organic carbon (SOC) within particle\uffe2\uff80\uff90size fractions in a volcanic soil. Emphasis was given to the thermal properties of soils. Six representative sites in Mexico were selected in an area dominated by Andosols: a grassland site, four forested sites with different levels of degradation and an agricultural site. Soils were fractionated using ultrasonic energy until complete dispersion was achieved. The particle\uffe2\uff80\uff90size fractions were coarse sand, fine sand, silt, clay and particulate organic matter from the coarse sand sized fraction (POM\uffe2\uff80\uff90CS) and fine sand (POM\uffe2\uff80\uff90FS). Soil organic carbon decreased by 70% after forest conversion to cropland and long\uffe2\uff80\uff90term cultivation; forest cover loss resulted in a decrease in SOC of up to 60%. The grassland soil contained 45% more SOC than the cropland one. Soil organic carbon was mainly associated with the silt\uffe2\uff80\uff90size fraction; the most sensitive fractions to land\uffe2\uff80\uff90use change and forest cover depletion were POM followed by SOC associated with the silt and clay\uffe2\uff80\uff90sized fractions. Particulate organic matter can be used as an early indicator of SOC loss. The C lost from the clay and silt\uffe2\uff80\uff90sized fractions was thermally labile; therefore, the SOC stored in the more degraded forest soils was more recalcitrant (thermally resistant). Only the transformation of forest to agricultural land produced a similar loss of thermally stable C associated with the silt\uffe2\uff80\uff90sized fraction.</p>", "keywords": ["2. Zero hunger", "Soil organic matter", "thermal analyses", "550", "forest cover depletion", "[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology", "soil physical fractionation", "Andosols", "Soil physical fractionation", "Thermal analyses", "Agriculture", "04 agricultural and veterinary sciences", "15. 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