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.
", "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. Life on land", "630", "soil organic matter", "0401 agriculture", " forestry", " and fisheries", "[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology", "Forest cover depletion", "Andosol", "agriculture"]}, "links": [{"href": "https://doi.org/10.1111/j.1475-2743.2011.00341.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Use%20and%20Management", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1475-2743.2011.00341.x", "name": "item", "description": "10.1111/j.1475-2743.2011.00341.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1475-2743.2011.00341.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-04-15T00:00:00Z"}}, {"id": "10.1590/s0100-06832002000200016", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-27T16:20:30Z", "type": "Journal Article", "created": "2014-10-01", "title": "Estoques De Carbono E Nitrog\u00eanio E Distribui\u00e7\u00e3o De Fra\u00e7\u00f5es Org\u00e2nicas De Latossolo Do Cerrado Sob Diferentes Sistemas De Cultivo", "description": "Este estudo teve por objetivo avaliar o efeito de sistemas de cultivo sobre os estoques de carbono e nitrog\uffc3\uffaanio e sobre a distribui\uffc3\uffa7\uffc3\uffa3o de fra\uffc3\uffa7\uffc3\uffb5es (leve e pesada) da mat\uffc3\uffa9ria org\uffc3\uffa2nica de Latossolo Vermelho-Amarelo, em experimento da Embrapa Arroz e Feij\uffc3\uffa3o (GO). Os tratamentos amostrados consistiram da combina\uffc3\uffa7\uffc3\uffa3o de dois sistemas de preparo do solo (plantio direto e ara\uffc3\uffa7\uffc3\uffa3o mais gradagem do solo) com duas rota\uffc3\uffa7\uffc3\uffb5es: (1) pousio/arroz - pousio/soja e (2) crotal\uffc3\uffa1ria/arroz - milheto/soja. Como refer\uffc3\uffaancia, foi amostrada tamb\uffc3\uffa9m uma \uffc3\uffa1rea de Cerrado, nas adjac\uffc3\uffaancias do local do experimento. As determina\uffc3\uffa7\uffc3\uffb5es de C e N das diferentes fra\uffc3\uffa7\uffc3\uffb5es org\uffc3\uffa2nicas foram realizadas entre os meses de janeiro e agosto de 2000. Em rela\uffc3\uffa7\uffc3\uffa3o ao Cerrado, houve uma redu\uffc3\uffa7\uffc3\uffa3o de cerca de 50 % nos teores de C e N dos solos cultivados. Os estoques de C e N nas \uffc3\uffa1reas cultivadas n\uffc3\uffa3o se mostraram inferiores nas \uffc3\uffa1reas com revolvimento de solo, em rela\uffc3\uffa7\uffc3\uffa3o \uffc3\uffa0s \uffc3\uffa1reas sob plantio direto. A maior parte (60-90 %) do carbono mostrou-se associada \uffc3\uffa0s fra\uffc3\uffa7\uffc3\uffb5es granulom\uffc3\uffa9tricas mais finas e a ara\uffc3\uffa7\uffc3\uffa3o do solo aumentou esta tend\uffc3\uffaancia. Os teores de C nas fra\uffc3\uffa7\uffc3\uffb5es leves foram reduzidos com a substitui\uffc3\uffa7\uffc3\uffa3o da vegeta\uffc3\uffa7\uffc3\uffa3o de Cerrado pelos agroecossistemas, e essa fra\uffc3\uffa7\uffc3\uffa3o da mat\uffc3\uffa9ria org\uffc3\uffa2nica do solo (MOS) caracterizou-se como o indicador mais sens\uffc3\uffadvel das altera\uffc3\uffa7\uffc3\uffb5es causadas pelos sistemas de cultivo avaliados sobre o teor da MOS.
", "keywords": ["preparo do solo", "2. Zero hunger", "solo sob floresta", "Agriculture (General)", "fracionamento f\u00edsico", "04 agricultural and veterinary sciences", "forest soil", "mat\u00e9ria org\u00e2nica", "S1-972", "rota\u00e7\u00e3o de culturas", "crop rotation", "soil organic matter", "tillage", "physical fractionation", "0401 agriculture", " forestry", " and fisheries"]}, "links": [{"href": "https://doi.org/10.1590/s0100-06832002000200016"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Revista%20Brasileira%20de%20Ci%C3%AAncia%20do%20Solo", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1590/s0100-06832002000200016", "name": "item", "description": "10.1590/s0100-06832002000200016", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1590/s0100-06832002000200016"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2002-06-01T00:00:00Z"}}, {"id": "11369/445679", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-27T16:26:13Z", "type": "Journal Article", "created": "2023-10-25", "title": "Distribution of soil organic carbon between particulate and mineral-associated fractions as affected by biochar and its co-application with other amendments", "description": "Open AccessNo data was used for the research described in the article.", "keywords": ["EXAFS", "Take urgent action to combat climate change and its impacts", "550", "Long-term experiment", "Iron oxide", "628", "Physical fractionation", "Organo-mineral interactions", "Compost", "http://metadata.un.org/sdg/13", "Organo-mineral interaction", "Iron oxides", "Long-term experiment", " Iron oxides", " Organo-mineral interactions", " Physical fractionation", " EXAFS", " Compost"]}, "links": [{"href": "https://iris.univr.it/bitstream/11562/1110866/2/Agr%20Ecos%20Environ%2c%202024%20-%20Distribution%20of%20SOC%20between%20POM%20and%20MAOM%20fractions.pdf"}, {"href": "https://doi.org/11369/445679"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agriculture%2C%20Ecosystems%20%26amp%3B%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11369/445679", "name": "item", "description": "11369/445679", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11369/445679"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-02-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Physical+fractionation&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=Physical+fractionation&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=Physical+fractionation&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Physical+fractionation&offset=6", "hreflang": "en-US"}], "numberMatched": 6, "numberReturned": 6, "distributedFeatures": [], "timeStamp": "2026-07-28T05:14:35.483748Z"}