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Biblioteca(s):  Embrapa Cerrados.
Data corrente:  03/02/2016
Data da última atualização:  03/02/2016
Tipo da produção científica:  Artigo em Periódico Indexado
Autoria:  FUJISAKI, K.; PERRIN, A.-S.; DESJARDINS, T.; BERNOUX, M.; BALBINO, L. C.; BROSSARD, M.
Afiliação:  LUIZ CARLOS BALBINO, CPAC.
Título:  From forest to cropland and pasture systems: a critical review of soil organic carbon stocks changes in Amazonia.
Ano de publicação:  2015
Fonte/Imprenta:  Global Change Biology, v. 21, n. 7, p. 2773-2786, Jul. 2015.
DOI:  http://doi.dx.org/1518-279710.1111/gcb.12906
Idioma:  Português
Conteúdo:  Abstract - The impact of deforestation on soil organic carbon (SOC) stocks is important in the context of climate change and agricultural soil use. Trends of SOC stock changes after agroecosystem establishment vary according to the spatial scale considered, and factors explaining these trends may differ sometimes according to meta-analyses. We have reviewed the knowledge about changes in SOC stocks in Amazonia after the establishment of pasture or cropland, sought relationships between observed changes and soil, climatic variables and management practices, and synthesized the ?13C measured in pastures. Our dataset consisted of 21 studies mostly synchronic, across 52 sites (Brazil, Colombia, French Guiana, Suriname), totalling 70 forest?agroecosystem comparisons. We found that pastures (n = 52, mean age = 17.6 years) had slightly higher SOC stocks than forest (+6.8 ± 3.1 %), whereas croplands (n = 18, mean age = 8.7 years) had lower SOC stocks than forest (?8.5 ± 2.9 %). Annual precipitation and SOC stocks under forest had no effect on the SOC changes in the agroecosystems. For croplands, we found a lower SOC loss than other meta-analyses, but the short time period after deforestation here could have reduced this loss. There was no clear effect of tillage on the SOC response. Management of pastures, whether they were degraded/nominal/improved, had no significant effect on SOC response. ?13C measurements on 16 pasture chronosequences showed that decay of forest-derived SOC was... Mostrar Tudo
Palavras-Chave:  Annual crop; Carbon storage; Chronosequence; Grassland; Rainforest; Soil tillage.
Thesaurus Nal:  deforestation; humid tropics; soil organic matter.
Categoria do assunto:  P Recursos Naturais, Ciências Ambientais e da Terra
URL:  https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1036013/1/BalbinoFromforest.pdf
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Cerrados (CPAC)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CPAC35144 - 1UPCAP - PPS2046S2046
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Biblioteca(s):  Embrapa Soja.
Data corrente:  08/12/2009
Data da última atualização:  24/06/2024
Tipo da produção científica:  Artigo em Periódico Indexado
Circulação/Nível:  B - 1
Autoria:  OLIVEIRA NETO, W. de; MUNIZ, A. S.; SILVA, M. A. G.; CASTRO, C. de; BORKERT, C. M.
Afiliação:  WALDEMAR DE OLIVEIRA NETO, CNPSO; ANTÔNIO SARAIVA MUNIZ, UEM; MARIA ANITA GONÇALVES DA SILVA, UEM; CESAR DE CASTRO, CNPSO; CLOVIS MANUEL BORKERT, CNPSO.
Título:  Boron extraction and vertical mobility in Paraná State oxisol, Brazil.
Ano de publicação:  2009
Fonte/Imprenta:  Revista Brasileira de Ciência do Solo, Viçosa, v. 33, n. 5, p. 1259-1267, set./out. 2009.
Idioma:  Inglês
Conteúdo:  The deficiency or excess of micronutrients has been determined by analyses of soil and plant tissue. In Brazil, the lack of studies that would define and standardize extraction and determination methods, as well as lack of correlation and calibration studies, makes it difficult to establish limits of concentration classes for analysis interpretation and fertilizer recommendations for crops. A specific extractor for soil analysis is sometimes chosen due to the ease of use in the laboratory and not in view of its efficiency in determining a bioavailable nutrient. The objectives of this study were to: (a) evaluate B concentrations in the soil as related to the fertilizer rate, soil depth and extractor; (b) verify the nutrient movement in the soil profile; (c) evaluate efficiency of Hot Water, Mehlich-1 and Mehlich-3 as available B extractors, using sunflower as test plant. The experimental design consisted of complete randomized blocks with four replications and treatments of five B rates (0, 2, 4, 6, and 8 kg ha-1) applied to the soil surface and evaluated at six depths (0?0.05, 0.05?0.10, 0.10?0.15, 0.15?0.20, 0.20?0.30, and 0.30?0.40 m). Boron concentrations in the soil extracted by Hot Water, Mehlich-1 and Mehlich-3 extractors increased linearly in relation to B rates at all depths evaluated, indicatingB mobility in the profile. The extractors had different B extraction capacities, but were all efficient to evaluate bioavailability of the nutrient to sunflower. M
Palavras-Chave:  Micronutrientes.
Thesagro:  Boro; Solo.
Categoria do assunto:  X Pesquisa, Tecnologia e Engenharia
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Soja (CNPSO)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status
CNPSO30072 - 1UPCAP - DD
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