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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Soil organic matter quality in Jatropha spp. plantations in different edaphoclimatic conditions.
Autores:  FREITAS, R. de C. A. de
POPIN, G. V.
MILORI, D. M. B. P.
SIGNOR, D.
DRUMOND, M. A.
CERRI, C. E. P.
Data:  2017-04-10
Ano:  2017
Palavras-chave:  Matéria orgânica
Massa microbiana
Mudança de uso da terra
Fracionamento de carbono do solo
Espectroscopia de fluorescência
Solo
Carbono
Vegetação nativa
Soil
Land use change
Soil carbon fractionation
Carbon management index
Laser-induced fluorescence spectroscopy
Microbial biomass
Resumo:  The substitution of native vegetation by agricultural ecosystems can change the quantity and quality of soil organic matter (SOM), and the intensity of these changes depends on the soil type, climate, and land use. The objective of this study was to evaluate the quality of organic matter in chronosequences of Jatropha cultivation in contrasting soil and climatic conditions. Soil samples were evaluated at depths of 0.00-0.10, 0.20-0.30, and 0.80-1.00 m in chronosequences located in Planaltina, Distrito Federal (Cerrado-Pasture-Jatropha), Dourados, Mato Grosso do Sul (Atlantic Forest-Corn-Jatropha), and Araripina, Pernambuco (Caatinga-Jatropha). To assess SOM quality, we determined C contents in the SOM fractions, C stocks, the carbon management index (CMI), the SOM humification index (HLIF), and the C and N concentrations in the microbial biomass. The conversion of native vegetation to agropastoral systems changed the composition of SOM in the biomes evaluated, especially in the surface layers. The CMI and the C and N contents in the microbial biomass were the most responsive to land use changes in all the biomes studied. The pasture improved SOM quality by increasing the CMI (116) and the C content by 8, 21, and 6 % in the organic, mineral, and organomineral fractions, respectively, while maintaining the SOM humification index and the C and N contents in the microbial biomass in the 0-0.10 m layer. The lowest values of C in the SOM fractions, the CMI (52), and C microbial biomass (136 mg kg-1) were observed for annual crops. Jatropha cultivation increased C contents in the SOM fractions, C stocks, the CMI, and C and N in the microbial biomass with an increase in cultivation time, which demonstrates the potential of this long-term system for improving SOM quality.

2017
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Inglês
Identificador:  56539

http://www.alice.cnptia.embrapa.br/handle/doc/1068272

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/158778/1/Drumond-2017.pdf

10.1590/18069657rbcs20160218
Editor:  Revista Brasileira de Ciência do Solo, v. 41, p. 1-18, 2017.
Relação:  Embrapa Semiárido - Artigo em periódico indexado (ALICE)
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