{"type": "FeatureCollection", "features": [{"id": "10.1007/s003740050443", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-23T16:15:04Z", "type": "Journal Article", "created": "2002-08-25", "title": "Land Use Effects On Labile N Extracted With Permanganate And The Nitrogen Management Index In The Cerrado Region Of Brazil", "description": "The effect of land use on the availability of nitrogen (N) was studied by separating total N into a labile and a stable fraction by oxidation and extraction of labile N with KMnO4. The nitrogen management index (NMI) was calculated following the method of Blair et al. (1995) for the carbon management index. In all systems, labile N released by KMnO4 was a better indicator of N availability than total and stable N. The NMI was a good indicator of N availability but gave no information about the total amount of N. In land use system analysis, total N and labile N can be used together as a simple and rapid way to evaluate the N status of the soil. Legume-based pastures specifically increased the amount of labile N. Although soybeans had a dominant role in the continuous cropping systems studied, the total N contents of these systems were lower than those of the natural Cerrado. The availability of N under legume-based pastures and legume-based pasture-crop rotations was higher than under the natural Cerrado and the continuous cropping systems.", "keywords": ["2. Zero hunger", "utilizaci\u00f3n de la tierra", "mineralizaci\u00f3n", "nitrogen management index", "land use", "nitrogen availability", "disponibilidad de nutrientes", "04 agricultural and veterinary sciences", "15. Life on land", "feed crops", "01 natural sciences", "oxisols", "nitr\u00f3geno", "ferralsoles", "0401 agriculture", " forestry", " and fisheries", "mineralization", "0105 earth and related environmental sciences"], "contacts": [{"organization": "Westerhof, R, Vilela, L, Ayarza, Miguel Angel, Zech, W.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s003740050443"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biology%20and%20Fertility%20of%20Soils", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s003740050443", "name": "item", "description": "10.1007/s003740050443", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s003740050443"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1998-09-18T00:00:00Z"}}, {"id": "10.1016/j.agee.2003.12.008", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-23T16:15:52Z", "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": "10.1016/j.still.2006.07.009", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:17:45Z", "type": "Journal Article", "created": "2006-09-08", "title": "Storage And Forms Of Organic Carbon In A No-Tillage Under Cover Crops System On Clayey Oxisol In Dryland Rice Production (Cerrados, Brazil)", "description": "The management and enhancement of soil organic carbon (SOC) is very important for agriculture (fertility) as well as for the environment (carbon (C) sequestration). Consequently, changes in soil management may alter SOC content. No-tillage (NT) practices are potential ways to increase SOC. We studied the SOC from agricultural soils in the Cerrados in Central Brazil. We compared two different tillage systems: conservation agriculture with no-tillage under cover crops (NT) and disc tillage (DT) for 5 years in a context of rainfed rice production. The soil is a dark red oxisol with high clay content (about 40%). The objectives of the study were: (i) to evaluate the short-term (5 years) impact of tillage systems on SOC stocks in an oxisol and (ii) to better understand the dynamics of SOC in different fractions of this soil. We first studied the initial situation in 1998, and compared it to the 2003 situation. NT with cover crop (Crotalaria) was found to increase the storage of C in the topsoil layer (0-10 cm) compared to DT. The difference observed for the 0-10 cm layer under NT in comparison with DT represented C enrichment under no-tillage amounting to 0.35 Mg C ha-1 year-1 and corresponding to less than 10% of cover crops residues returned to the soil. A particle-size fractionation of soil organic matter (SOM) showed that differences in total SOC between NT and DT mainly affected the 0-2 \u00b5m fraction and, to a smaller extent the 2-20 \u00b5m fraction. This specific enrichment of SOC in the silt and clay fraction was attributed to (i) the storage of a water soluble C in the field and (ii) the effect of soil biota and especially fauna activity. The mean residence time of carbon associated with the fine fractions being rather long, it might be assumed that the preferential storage in fine fractions resulted in a long-term carbon storage. This study suggests a positive short-term effect of a no-tillage system on C sequestration in an oxisol. \u00a9 2006 Elsevier B.V. All rights reserved", "keywords": ["P33 - Chimie et physique du sol", "http://aims.fao.org/aos/agrovoc/c_2858", "Oryza sativa", "fractionnement", "[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study", "SOIL ORGANIC CARBON", "01 natural sciences", "630", "CERRADOS", "PARTICLE-SIZE FRACTIONATION OF SOM", "CARBON SEQUESTRATION", "culture sous couvert v\u00e9g\u00e9tal", "no tillage", "OXISOL", "ferralsol", "http://aims.fao.org/aos/agrovoc/c_1301", "[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study", "http://aims.fao.org/aos/agrovoc/c_8511", "http://aims.fao.org/aos/agrovoc/c_35657", "0105 earth and related environmental sciences", "F07 - Fa\u00e7ons culturales", "2. Zero hunger", "Cerrados", "http://aims.fao.org/aos/agrovoc/c_1977", "non-travail du sol", "04 agricultural and veterinary sciences", "15. Life on land", "carbon sequestration", "http://aims.fao.org/aos/agrovoc/c_331583", "particle size fractionation of SOM", "s\u00e9questration du carbone", "http://aims.fao.org/aos/agrovoc/c_3074", "oxisol", "http://aims.fao.org/aos/agrovoc/c_1070", "13. Climate action", "http://aims.fao.org/aos/agrovoc/c_25706", "http://aims.fao.org/aos/agrovoc/c_5438", "0401 agriculture", " forestry", " and fisheries", "NO-TILLAGE", "Crotalaria", "carbone", "Brazil", "RIZ", "mati\u00e8re organique du sol"]}, "links": [{"href": "https://doi.org/10.1016/j.still.2006.07.009"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.still.2006.07.009", "name": "item", "description": "10.1016/j.still.2006.07.009", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.still.2006.07.009"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-05-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2006.12.024", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-23T16:17:30Z", "type": "Journal Article", "created": "2007-01-23", "title": "Microaggregate-Associated Carbon As A Diagnostic Fraction For Management-Induced Changes In Soil Organic Carbon In Two Oxisols", "description": "Abstract Carbon stabilization by macroaggregate-occluded microaggregates (Mm) has been proposed as a principal mechanism for long-term soil organic carbon (SOC) sequestration in temperate alternative agricultural and (af)forested systems. The aim of this study was to evaluate the importance of the Mm fraction for long-term C stabilization in Oxisols and to validate its diagnostic properties for total SOC changes upon changes in land use. Soil samples were taken from the 0\u20135 and 5\u201320\u00a0cm soil layers of native forest vegetation (NV), conventional tillage (CT) and no-tillage (NT) systems at an experimental site near Passo Fundo and one near Londrina in Southern Brazil. After aggregate-size separations by wet-sieving, macroaggregate-occluded water-stable microaggregates (53\u2013250\u00a0\u03bcm) (Mm) were isolated from large (>2000\u00a0\u03bcm) and small (>250\u00a0\u03bcm) macroaggregates. Particulate organic matter located inside the Mm (intra-Mm-POM) and the mineral fraction ( \u22122 ) among different land use systems were always accompanied by parallel Mm-C stock differences. Though total SOC did not differ among land use systems in the 0\u201320\u00a0cm depth at both sites, Mm-C stocks were greater under NT compared to the CT treatment in the 0\u201320\u00a0cm depth at the Londrina site. We concluded that in these highly weathered tropical soils the Mm-C fraction is a more responsive fraction to management changes than total SOC and represents a diagnostic fraction for present as well as potential total SOC changes upon land-use change.", "keywords": ["2. Zero hunger", "C sequestration", "No-tillage", "0401 agriculture", " forestry", " and fisheries", "Microaggregates", "Forest", "04 agricultural and veterinary sciences", "Oxisols", "15. Life on land"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2006.12.024"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2006.12.024", "name": "item", "description": "10.1016/j.soilbio.2006.12.024", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2006.12.024"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-05-01T00:00:00Z"}}, {"id": "10.1016/j.still.2008.09.003", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:17:46Z", "type": "Journal Article", "created": "2008-11-08", "title": "Stratification Ratio Of Soil Organic Matter Pools As An Indicator Of Carbon Sequestration In A Tillage Chronosequence On A Brazilian Oxisol", "description": "Abstract Long-term no-tillage (NT) leads to profile stratification of soil organic matter (SOM) pools, and the soil organic carbon (SOC) stratification ratio (SR) is an indicator of soil quality. The objective of this report is to assess the feasibility of using SOC-SR as an index for estimating SOC sequestration in NT soils. The effect of a plow tillage (PT) and NT chronosequence on the SR of SOM pools was assessed in an Oxisol in Southern Brazil (50\u00b023\u2032W and 24\u00b036\u2032S). The chronosequence consisted of six sites: (i) native field (NF); (ii) PT of the native field (PNF-1) involving conversion of natural vegetation to cropland; (iii) NT for 10 years (NT-10); (iv) NT for 20 years (NT-20); (v) NT for 22 years (NT-22); (vi) conventional tillage for 22 years (CT-22). Soil samples were collected from four depths (0\u20135\u00a0cm; 5\u201310\u00a0cm; 10\u201320\u00a0cm; 20\u201340\u00a0cm layer) and soil parameters comprised by SOM pools [i.e., C, N, S, particulate organic C (POC), particulate N (PN), stable C (SC) and stable N (SN), microbial biomass C (MBC) and microbial biomass N (MBN), basal respiration (BR), dissolved organic C (DOC), total polysaccharides (TP) and labile polysaccharides (LP)] were measured. In undisturbed NF soil, the SR of all parameters increased with increase in soil depth. In contrast, the SR decreased in PT, and the SOM was uniformly distributed in the soil profile. All NT treatments restored the SR, and were characterized with higher values of all measured parameters compared to NF. The SR for SOC ranged from 1.12 to 1.51 for CT-22 compared with 1.64\u20132.61 SR for NT surface and sub-soil layers, respectively. The SR for POC and PN were higher than those for stable C and N. However, SR for the biological pools (e.g., MBC, MBN and BR) were the highest and strongly correlated with the rate of SOC sequestration. An increase in SR of SOC was also positively correlated with the rate and amount of SOC sequestered. Regression analyses indicated a strong correlation between SR of SOC and all parameters monitored in this study. The data showed that the SR of SOC is an efficient indicator of C sequestration in long-term NT management.", "keywords": ["Carbon sequestration", "2. Zero hunger", "Soil organic matter", "Chronosequence", "No-till", "Black oats", "04 agricultural and veterinary sciences", "15. Life on land", "Soil fertility", "Stratification ratio", "Soil quality", "Lupine", "6. Clean water", "Tillage", "Soil erosion", "0401 agriculture", " forestry", " and fisheries", "Som pools", "Oxisols", "Field Scale", "Conservation tillage"]}, "links": [{"href": "https://doi.org/10.1016/j.still.2008.09.003"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.still.2008.09.003", "name": "item", "description": "10.1016/j.still.2008.09.003", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.still.2008.09.003"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-04-01T00:00:00Z"}}, {"id": "10.1016/j.still.2008.11.007", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:17:47Z", "type": "Journal Article", "created": "2009-01-08", "title": "Soil Organic Carbon And Fertility Interactions Affected By A Tillage Chronosequence In A Brazilian Oxisol", "description": "Abstract No-till (NT) adoption is an essential tool for development of sustainable agricultural systems, and how NT affects the soil organic C (SOC) dynamics is a key component of these systems. The effect of a plow tillage (PT) and NT age chronosequence on SOC concentration and interactions with soil fertility were assessed in a variable charge Oxisol, located in the South Center quadrant of Parana State, Brazil (50\u00b023\u2019W and 24\u00b036'S). The chronosequence consisted of the following six sites: (i) native field (NF); (ii) PT of the native field (PNF-1) involving conversion of natural vegetation to cropland; (iii) NT for 10 years (NT-10); (iv) NT for 20 years (NT-20); (v) NT for 22 years (NT-22); and (vi) conventional tillage for 22 years (CT-22) involving PT with one disking after summer harvest and one after winter harvest to 20\u00a0cm depth plus two harrow disking. Soil samples were collected from five depths (0\u20132.5; 2.5\u20135; 5\u201310; 10\u201320; and 20\u201340\u00a0cm) and SOC, pH (in H 2 O and KCl), \u0394pH, potential acidity, exchangeable bases, and cation exchangeable capacity (CEC) were measured. An increase in SOC concentration positively affected the pH, the negative charge and the CEC and negatively impacted potential acidity. Regression analyses indicated a close relationship between the SOC concentration and other parameters measured in this study. The regression fitted between SOC concentration and CEC showed a close relationship. There was an increase in negative charge and CEC with increase in SOC concentration: CEC increased by 0.37\u00a0cmol c \u00a0kg \u22121 for every g of C\u00a0kg \u22121 soil. The ratio of ECEC:SOC was 0.23\u00a0cmol c \u00a0kg \u22121 for NF and increased to 0.49\u00a0cmol c \u00a0kg \u22121 for NT-22. The rates of P and K for 0\u201310\u00a0cm depth increased by 9.66\u00a0kg\u00a0ha \u22121 \u00a0yr \u22121 and 17.93\u00a0kg\u00a0ha \u22121 \u00a0yr \u22121 , respectively, with NF as a base line. The data presented support the conclusion that long-term NT is a useful strategy for improving fertility of soils with variable charge.", "keywords": ["2. Zero hunger", "Soil management", "Soil organic matter", "Root depth", "Crop residues", "Cation exchange capacity (CEC)", "Conservation agriculture", "Chronosequence", "Acidity", "Sustainable agriculture", "No-till", "Soil ph", "04 agricultural and veterinary sciences", "15. Life on land", "Soil fertility", "Soil quality", "Tillage", "Variable charge", "Soil analysis", "0401 agriculture", " forestry", " and fisheries", "Oxisols", "Field Scale"]}, "links": [{"href": "https://doi.org/10.1016/j.still.2008.11.007"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.still.2008.11.007", "name": "item", "description": "10.1016/j.still.2008.11.007", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.still.2008.11.007"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-06-01T00:00:00Z"}}, {"id": "10.1016/j.still.2010.07.010", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:17:48Z", "type": "Journal Article", "created": "2010-08-14", "title": "Soil Carbon Stocks Under No-Tillage Mulch-Based Cropping Systems In The Brazilian Cerrado: An On-Farm Synchronic Assessment", "description": "No-tillage mulch-based (NTM) cropping systems have been widely adopted by farmers in the Brazilian savanna region (Cerrado biome). We hypothesized that this new type of management should have a profound impact on soil organic carbon (SOC) at regional scale and consequently on climate change mitigation. The objective of this study was thus to quantify the SOC storage potential of NTM in the oxisols of the Cerrado using a synchronic approach that is based on a chronosequence of fields of different years under NTM. The study consisted of three phases: (1) a farm/cropping system survey to identify the main types of NTM systems to be chosen for the chronosequence; (2) a field survey to identify a homogeneous set of situations for the chronosequence and (3) the characterization of the chronosequence to assess the SOC storage potential. Themain NTM system practiced by farmers is an annual succession of soybean (Glycine max) or maize (Zea mays) with another cereal crop. This cropping system covers 54% of the total cultivated area in the region. At the regional level, soil organic C concentrations from NTM fields were closely correlated with clay + silt content of the soil (r2 = 0.64). No significant correlation was observed (r2 = 0.07), however, between these two variables when we only considered the fields with a clay + silt content in the 500- 700 g kg_1 range. The final chronosequence of NTM fields was therefore based on a subsample of eight fields, within this textural range. The SOC stocks in the 0-30 cm topsoil layer of these selected fields varied between 4.2 and 6.7 kg C m_2 and increased on average (r2 = 0.97) with 0.19 kg C m_2 year_1. After 12 years of NTM management, SOC stocks were no longer significantly different from the stocks under natural Cerrado vegetation (p < 0.05), whereas a 23-year-old conventionally tilled and cropped field showed SOC stocks that were about 30% below this level. Confirming our hypotheses, this study clearly illustrated the high potential of NTM systems in increasing SOC storage under tropical conditions, and how a synchronic approach may be used to assess efficiently such modification on farmers' fields, identifying and excluding non desirable sources of heterogeneity (management, soils and climate). (Resume d'auteur)", "keywords": ["P33 - Chimie et physique du sol", "2. Zero hunger", "INTENSIVE AGRICULTURE", "Cover crops", "Chronosequence", "F08 - Syst\u00e8mes et modes de culture", "Tropics", "04 agricultural and veterinary sciences", "[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study", "COVER CROPS", "CHRONOSEQUENCE", "15. Life on land", "630", "OXISOLS", "Intensive agriculture", "http://aims.fao.org/aos/agrovoc/c_1070", "13. Climate action", "TROPICS", "0401 agriculture", " forestry", " and fisheries", "carbone", "Oxisols", "http://aims.fao.org/aos/agrovoc/c_1301", "[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study"]}, "links": [{"href": "https://doi.org/10.1016/j.still.2010.07.010"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.still.2010.07.010", "name": "item", "description": "10.1016/j.still.2010.07.010", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.still.2010.07.010"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-09-01T00:00:00Z"}}, {"id": "10.1111/gcb.16135", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:19:27Z", "type": "Journal Article", "created": "2022-02-17", "title": "Mycorrhizal fungi alleviate acidification\u2010induced phosphorus limitation: Evidence from a decade\u2010long field experiment of simulated acid deposition in a tropical forest in south China", "description": "Abstract

South China has been experiencing very high rate of acid deposition and severe soil acidification in recent decades, which has been proposed to exacerbate the regional ecosystem phosphorus (P) limitation. We conducted a 10\uffe2\uff80\uff90year field experiment of simulated acid deposition to examine how acidification impacts seasonal changes of different soil P fractions in a tropical forest with highly acidic soils in south China. As expected, acid addition significantly increased occluded P pool but reduced the other more labile P pools in the dry season. In the wet season, however, acid addition did not change microbial P, soluble P and labile organic P pools. Acid addition significantly increased exchangeable Al3+ and Fe3+ and the activation of Fe oxides in both seasons. Different from the decline of microbial abundance in the dry season, acid addition increased ectomycorrhizal fungi and its ratio to arbuscular mycorrhiza fungi in the wet season, which significantly stimulated phosphomonoesterase activities and likely promoted the dissolution of occluded P. Our results suggest that, even in already highly acidic soils, the acidification\uffe2\uff80\uff90induced P limitation could be alleviated by stimulating ectomycorrhizal fungi and phosphomonoesterase activities. The differential responses and microbial controls of seasonal soil P transformation revealed here should be implemented into ecosystem biogeochemical model for predicting plant productivity under future acid deposition scenarios.Land use change and land management practices can modify soil carbon (C) dynamics and soil fertility. This study evaluated the effect of tillage systems (no-tillage - NT and conventional tillage - CT) on soil C and nutrient stocks in an Oxisol from an Amazonian cerrado following land use change. The study also identified relationships between these stocks and other soil attributes. Carbon, P, K, Ca and Mg stocks, adjusted to the equivalent soil mass in the cerrado (CE), were higher under NT. After adoption of all but one of the NT treatments, C stocks were higher than they were in the other areas we considered. Correlations between C and nutrient stocks showed positive correlations with Ca and Mg under NT due to continuous liming, higher crop residue inputs and lack of soil disturbance, associated with positive correlations with cation exchange capacity (CEC), base saturation and pH. The positive correlation (r = 0.91, p < 0.05) between C stocks and CEC in the CE indicates the important contribution of soil organic matter (SOM) to CEC in tropical soils, although the exchange sites are - under natural conditions - mainly occupied by H and Al. Phosphorus and K stocks showed positive correlations (0.81 and 0.82, respectively) with C stocks in the CE, indicating the direct relationship of P and K with SOM in natural ecosystems. The high spatial variability of P and K fertilizer application may be obscuring these soil nutrient stocks. In this study, the main source of P and K was fertilizer rather than SOM.

", "keywords": ["2. Zero hunger", "Latossolo", "estoque de nutrientes", "no-tillage", "conventional tillage", "04 agricultural and veterinary sciences", "Oxisol", "15. Life on land", "plantio direto", "plantio convencional", "13. Climate action", "nutrient stock", "0401 agriculture", " forestry", " and fisheries"]}, "links": [{"href": "https://doi.org/10.1590/s0103-90162009000200013"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Scientia%20Agricola", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1590/s0103-90162009000200013", "name": "item", "description": "10.1590/s0103-90162009000200013", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1590/s0103-90162009000200013"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-04-01T00:00:00Z"}}, {"id": "10.5281/zenodo.2645510", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-23T16:24:13Z", "type": "Dataset", "title": "C-isotopic signatures and soil properties of Amazon basin oxisols", "description": "Open AccessThis dataset presents C isotopic data from two sites (Apu\u00ed and Manacapuru) located in the state of Amazonas, Brazil. Soils were sampled at three time periods, under weak raining (March-2016), extreme dry (August-2016), and strong wet (March-2017) conditions. The dataset first presents general information about the site (on the tab 'site'), followed by more detailed information (on the tab 'profile') about both sampling locations. The coordinates, altitude, mean annual temperature, mean annual precipitation, soil order in USDA taxonomy and their respective land use categories and vegetation classifications are described. On the 'layer' tab, information about the soil depth, percent sand, silt and clay, pH CaCl2 and H2O, Organic and Total Carbon, total nitrogen and carbon/nitrogen ratio are described. The bulk C-isotopic signature is also listed on this tab as the Bulk Layer \u039414C and its standard deviation, Bulk Layer Fraction Modern and its standard deviation. The 'Incubation' tab describes details of the soil incubations conducted at Apu\u00ed and Manacapuru. Information about the material and length of incubation, as well as the CO2 fluxes over the duration of incubation are reported. The respired C-isotopic signature during the incubation is also given on this tab as the incubation \u039414C and its standard deviation, incubation Fraction Modern and its standard deviation.", "keywords": ["2. Zero hunger", "Total Carbon", "Organic Carbon", "14C", "13. Climate action", "Incubation", "Amazon basin", "15. Life on land", "ISRaD", "Oxisols", "Carbon Isotope"], "contacts": [{"organization": "Kuhnen, \u00c1gatha, Matschullat, J\u00f6rg, Sierra, Carlos A, Lima, R. M. B. de,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.2645510"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.2645510", "name": "item", "description": "10.5281/zenodo.2645510", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.2645510"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-11-05T00:00:00Z"}}, {"id": "35175681", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:27:34Z", "type": "Journal Article", "created": "2022-02-17", "title": "Mycorrhizal fungi alleviate acidification\u2010induced phosphorus limitation: Evidence from a decade\u2010long field experiment of simulated acid deposition in a tropical forest in south China", "description": "Abstract

South China has been experiencing very high rate of acid deposition and severe soil acidification in recent decades, which has been proposed to exacerbate the regional ecosystem phosphorus (P) limitation. We conducted a 10\uffe2\uff80\uff90year field experiment of simulated acid deposition to examine how acidification impacts seasonal changes of different soil P fractions in a tropical forest with highly acidic soils in south China. As expected, acid addition significantly increased occluded P pool but reduced the other more labile P pools in the dry season. In the wet season, however, acid addition did not change microbial P, soluble P and labile organic P pools. Acid addition significantly increased exchangeable Al3+ and Fe3+ and the activation of Fe oxides in both seasons. Different from the decline of microbial abundance in the dry season, acid addition increased ectomycorrhizal fungi and its ratio to arbuscular mycorrhiza fungi in the wet season, which significantly stimulated phosphomonoesterase activities and likely promoted the dissolution of occluded P. Our results suggest that, even in already highly acidic soils, the acidification\uffe2\uff80\uff90induced P limitation could be alleviated by stimulating ectomycorrhizal fungi and phosphomonoesterase activities. The differential responses and microbial controls of seasonal soil P transformation revealed here should be implemented into ecosystem biogeochemical model for predicting plant productivity under future acid deposition scenarios.