{"type": "FeatureCollection", "features": [{"id": "10.1016/j.agee.2003.12.008", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:15:06Z", "type": "Journal Article", "created": "2004-02-05", "title": "Effects Of Forest Conversion To Pasture On Soil Carbon Content And Dynamics In Brazilian Amazonia", "description": "Abstract   Soils play an important role in the carbon cycle, and deforestation in the tropics affects both soil carbon storage and CO2 release into the atmosphere. The consequences of deforestation and conversion to pasture for soil carbon content and dynamics were examined in two soil types differing mainly by their texture. Two chronosequences were selected, each consisting of an intact forest and three pastures of different ages (4, 8, 15 years and 3, 9, 15 years, respectively). One chronosequence is located in the central part of the Brazilian Amazon basin, where the soils are clayey ferralsols, and the second in the Eastern Brazilian Amazon Basin, where the soils are sandy clayey acrisols. In the upper layer the C content of clayey soils was three times higher than in the sandy soils, but despite the differences in soil texture, the C distribution in the particle-size fractions was quite similar. In the two chronosequences, the conversion to pasture induced a slight increase in C content. Bulk density increases were greater on soils with lower clay contents. The       13   C    measurements, which allowed to calculate the distribution of C derived from forest and from pasture, showed that all the particle-size fractions incorporated C derived from pasture and that a significant proportion of the young organic matter is rapidly trapped in the finest fractions. Although the proportions of pasture-derived C were higher in the sandy soils than in the clayey soils, the amounts of pasture-derived C in the particle-size fractions were 2\u20133 times larger in the clayey soils than in the sandy soils.", "keywords": ["rain-forest", "550", "ZONE TROPICALE", "c-13 natural abundance", "TEXTURE", "[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study", "630", "Carbon Cycle", "C-13 isotope", "Amazonia", "EVOLUTION DES SOLS SOUS CULTURE", "STRUCTURE DU SOL", "soil carbon storage", "particle-size fractions", "Pasture", "cultivated oxisols", "ANALYSE ISOTOPIQUE", "SABLE", "eastern amazonia", "Deforestation", "[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study", "Acrisol", "2. Zero hunger", "tropical soils Organic-matter dynamics", "Brasil", "size-fractions", "PATURAGE", "turnover", "Soil Carbon", "04 agricultural and veterinary sciences", "South America", "15. Life on land", "CARBONE ORGANIQUE", "STOCK ORGANIQUE", "ARGILE", "0401 agriculture", " forestry", " and fisheries", "DEFORESTATION", "texture"], "contacts": [{"organization": "Desjardins, T., Barros, E., Sarrazin, M., Girardin, C., Mariotti, A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1016/j.agee.2003.12.008"}, {"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": "10.1016/j.agee.2003.12.008", "name": "item", "description": "10.1016/j.agee.2003.12.008", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.agee.2003.12.008"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2004-07-01T00:00:00Z"}}, {"id": "10.1078/0031-4056-00268", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:17:56Z", "type": "Journal Article", "created": "2005-08-18", "title": "Effects Of Earthworm Inoculation On Soil Organic Matter Dynamics Of A Cultivated Ultisol", "description": "In Peruvian Amazonia, cropping techniques manipulating the biological processes of soil fertility have been tested to increase productivity and sustainability of crops. Special attention was paid to earthworms since theircommunities are dominant in natural ecosystems and severely depleted in cultivated soils, and also because their populations can be manipulated. The objective of this work was to evaluate the impact of the endogeic earthworm Pontoscolex corethrurus on soil organic matter dynamics, by comparing treatments with and without earthworms. Carbon dynamics is described using particle-size fractionation and in situ natural isotopic labelling (carbon 13) obtained by shift of C3 to C4 vegetation. After 6 years of maize cultivation, the organic carbon stock of the 0-10 cm layer decreased respectively by 4 and 27 % in the control and the earthworm inoculated treatments. For the inoculated treatment this decrease mainly occurred in the large particle size (plant residues) Seventy % of the carbon derived from forest was lost during 6 years in the 2000-200 pm fractions in the inoculated treatment and 19 % in the control. However, the incorporation of carbon derived from maize in soil, especially in the large particle fractions (> 50 \u03bcm), was lower in the earthworm inoculated treatment. Accordingly, the proportions of carbon derived from forest and from maize were the same in the two treatments. Thus, the main effect of earthworm inoculation was a more important mineralisation of the carbon derived from forest and maize, especially in the large particle size fractions (> 50 \u03bcm).", "keywords": ["2. Zero hunger", "MAIS", "FORET", "SOL CULTIVE", "MATIERE ORGANIQUE", "MINERALISATION", "0401 agriculture", " forestry", " and fisheries", "ANALYSE ISOTOPIQUE", "04 agricultural and veterinary sciences", "INOCULATION", "15. 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