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Registros recuperados: 9
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Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems Scientia Agricola
Reis,Cecília Estima Sacramento dos; Dick,Deborah Pinheiro; Caldas,Jennifer da Silva; Bayer,Cimélio.
The capacity of soils to sequestrate carbon (C) is mainly related to the formation of organo-mineral complexes. In this study, we investigated the influence of soil management systems on the C retention capacity of soil with an emphasis on the silt and clay fractions of two subtropical soils with different mineralogy and climate. Samples from a Humic Hapludox and a Rhodic Hapludox, clayey soils cultivated for approximately 30 years under no-tillage (NT) and conventional tillage (CT) were collected from six layers distributed within 100-cm soil depth from each site and from an adjacent native forest. After the removal of particulate organic matter (POM), the suspension (<53 µm) was sonicated, the silt and clay fractions were separated in accordance with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon saturation; Mineralogy; Physical fractionation; Soil organic matter; Soil profile.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400006
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Carbon stocks in organic matter fractions as affected by land use and soil management, with emphasis on no-tillage effect Ciência Rural
Bayer,Cimélio; Dick,Deborah Pinheiro; Ribeiro,Genicelli Mafra; Scheuermann,Klaus Konrad.
Land use and soil management may affect both labile and humified soil organic matter (SOM) fractions, but the magnitude of these changes is poorly known in subtropical environments. This study investigated effects of four land use and soil management systems (forest, native pasture, and conventional tillage and no-tillage in a wheat/soybean succession) on (i) total soil organic carbon (SOC) stocks (0 to 250mm depth) and on (ii) carbon (C) stocks in labile (coarse, light) and humified (mineral-associated, humic substances) SOM fractions (0 to 25mm depth), in a Hapludox soil from southern Brazil. In comparison to the adjacent forest site, conventionally tilled soil presented 36% (46.2Mg ha-1) less SOC in the 0 to 250mm depth and a widespread decrease in C...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil organic matter; Physical fractionation; Light fraction; Coarse fraction; No-tillage.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782002000300006
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Frações granulométricas da matéria orgânica do solo em consórcio de milho safrinha com capim-marandu sob fontes de nitrogênio. Repositório Alice
FACCIN, F. C.; MARCHETTI, M. E.; SERRA, A. P.; ENSINAS, S. C..
O objetivo deste trabalho foi determinar o efeito do consórcio de milho safrinha com Urochloa brizantha 'Marandu' e de fontes de nitrogênio nas frações granulométricas da matéria orgânica do solo em sistema plantio direto. Os tratamentos foram dispostos em arranjo fatorial 2x4 ? dois tipos de cultivo de milho (com ou sem pasto) e quatro fontes de nitrogênio (sem nitrogênio, ureia, sulfato de amônio+ureia e sulfato de amônio) ?, em blocos ao acaso, com quatro repetições. O experimento foi conduzido de 2005 a 2013. As coletas do solo foram realizadas em 2013, após a colheita do milho no outono/inverno, em quatro profundidades: 0?5, 5?10, 10?20 e 20?40 cm. Foram determinados os teores de carbono orgânico total (COT), lábil (CL), particulado (COP) e mineral...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fracionamento físico; Matéria orgânica leve; Physical fractionation; Light organic matter; Zea mays; Plantio direto; Zea mays; No-tillage.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1063976
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Influence of summer crop residues on 15N present in organic matter fractions under two lowland soils Ciência Rural
Pollet,Carolina Schultz; Silva,Leandro Souza da; Chaves,Bruno; Rosa Neto,Lethícia; Dossin,Mariana Ferneda; Giacomini,Sandro José; Cargnelutti Filho,Alberto.
ABSTRACT: The state of Rio Grande do Sul has about 20% of the total area as lowland soils, suitable for flooded rice (Oryza sativa). In order to mitigate damage caused by rice monoculture, new crops such as sorghum (Sorghum bicolor) and soybean (Glycine max) have been cultivated in these areas. With different qualities of crop residues, it is expected a change in soil organic matter (SOM) dynamics and consequently, nitrogen (N) availability. The objective of this study was to evaluate the influence of rice, soybean and sorghum crop residues on the N present in physical fractions of SOM of two lowland soils, using labeled 15N technique, under incubation for 180 days in aerobic condition and more 180 days in anaerobic condition. At 30, 180 and 360 days of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physical fractionation; Paddy soils; 15N isotope.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000400251
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Initial Recovery of Organic Matter of a Grass-Covered Constructed Soil after Coal Mining Rev. Bras. Ciênc. Solo
Leal,Otávio dos Anjos; Castilhos,Rosa Maria Vargas; Pinto,Luiz Fernando Spinelli; Pauletto,Eloy Antonio; Lemes,Elisa Souza; Kunde,Roberta Jeske.
ABSTRACT Revegetation is essential to improve the quality of constructed soils. This study investigated effects of perennial grasses on total organic carbon (TOC) stock, organic matter (OM) fractions and on quality of a recently constructed soil, after coal mining. Soil samples were collected from the 0.00-0.03 m layer two years after the beginning of the experiment. The treatments consisted of Cynodon dactylon cv vaquero (T1); Urochloa brizantha (T2); Panicum maximun (T3); Urochloa humidicola (T4); Hemarthria altissima (T5); Cynodon dactylon cv tifton (T6); bare constructed soil (T8); and natural soil (T9). The treatments with grass species increased the TOC stock by 57 % and increased the OM lability in comparison with T8. Higher C accumulation in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Degraded areas; Physical fractionation; Carbon management index; Laser-induced fluorescence.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100529
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Organic matter composition in density fractions of Cerrado Ferralsols as revealed by CPMAS 13C NMR: Influence of pastureland, cropland and Integrated crop-livestock. Repositório Alice
BOENI, M.; BAYER, C.; MACEDO, M. C. M..
2014
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Soil use system; Physical fractionation; Spectroscopy; Sodium polytungstate.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1018299
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Quantity and quality of soil organic matter as a sustainability index different land uses in eastern Amazon. Repositório Alice
SIGNOR, D.; DEON, M. D.; CAMARGO, P. B. de; CERRI, C. E. P..
Soil organic matter (SOM), which influences chemical, physical and biological soil attributes, is the main form of C found in the soil which can also be used as a soil sustainability index. The aim of this study was to use the quantity and quality of SOM as an indicator to determine the sustainability of different land uses (native vegetation, secondary vegetation, fruit orchards, horticultural areas, degraded pasture, improved pasture, and fields with annual crops) in the eastern Amazon. Improved pasture had higher soil C stock than the other land uses and was similar to the native vegetation, and also presented the highest quantity of C in a stable form in the soil (fraction < 53 ìm). According to the C management index, improved pasture is the most...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Matéria orgânica; Uso da terra; Estoque de carbono; Mudanças no uso da terra; Fracionamento físico; Indice de gerenciamento de carbono; Biomassa microbiana; Solo; Sustentabilidade; Pastagem nativa; Carbon stocks; Changes in land use; Physical fractionation; Carbon management index; Microbial biomass.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1089385
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Quantity and quality of soil organic matter as a sustainability index under different land uses in Eastern Amazon Scientia Agricola
Signor,Diana; Deon,Magnus Dall’Igna; Camargo,Plínio Barbosa de; Cerri,Carlos Eduardo Pellegrino.
ABSTRACT: Soil organic matter (SOM), which influences chemical, physical and biological soil attributes, is the main form of C found in the soil which can also be used as a soil sustainability index. The aim of this study was to use the quantity and quality of SOM as an indicator to determine the sustainability of different land uses (native vegetation, secondary vegetation, fruit orchards, horticultural areas, degraded pasture, improved pasture, and fields with annual crops) in the eastern Amazon. Improved pasture had higher soil C stock than the other land uses and was similar to the native vegetation, and also presented the highest quantity of C in a stable form in the soil (fraction < 53 μm). According to the C management index, improved pasture is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: C stocks; Changes in land use; Physical fractionation; Carbon management index; Microbial biomass.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300225
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Soil Organic Matter Quality Indicators in a Cultivated Andisol Agricultura Técnica
Zagal,Erick; Córdova,Carolin.
Agricultural practices influence the dynamics of soil organic matter (MOS) and its fractions. In this study, the following labile fractions of soil organic matter were determined: free light fraction (FLL), intra-aggregate light fraction (FLI), microbial biomass and mineralized C-CO2, on volcanic soil with different rotations, and later their use was evaluated as biological indicators of the impact of agricultural practices on the soil. The study was carried out in an eight year field experiment, with different productive systems (rotations) in a randomized complete block design. The free light fraction (FLL) was determined by density fractionation with NaI (1.8 g cm-3), and the intra-aggregate light fraction (FLI) was obtained by sonication (1,500 J s-1)....
Tipo: Journal article Palavras-chave: Free light fraction; Physical fractionation; NaI; Soil microbial biomass; Fumigation-incubation.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200008
Registros recuperados: 9
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