Data/hora: 07/06/2024 03:41:13

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	10/01/2011	
Data da última atualização: 	03/11/2021	
Autoria: 	BARRETO, P. A. B.; GAMA-RODRIGUES, E. F.; GAMA-RODRIGUES, A. C.; FONTES, A. G.; POLIDORO, J. C.; MOÇO, M. K. S.; MACHADO, R. C. R.; BALIGAR, V. C.	
Afiliação: 	Universidade Estadual do Sudoeste da Bahia; Universidade Estadual do Norte Fluminense; Universidade Estadual do Sudoeste da Bahia; Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo; JOSE CARLOS POLIDORO, CNPS; Universidade Estadual do Sudoeste da Bahia; MARS, Center of Cocoa Science; USDA.	
Título: 	Distribution of oxidizable organic C fractions in soils under cacao agroforestry systems in Southern Bahia, Brazil.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	Agroforestry Systems, v. 81, n. 3, p. 213-220, Mar. 2011.	
DOI: 	https://doi.org/10.1007/s10457-010-9300-4	
Idioma: 	Inglês	
Conteúdo: 	Agroforestry systems can play a major role in the sequestration of carbon (C) because of their higher input of organic material to the soil. The importance of organic carbon to the physical, chemical, and biological aspects of soil quality is well recognized. However, total organic carbon measurements might not be sensitive indicators of changes in soil quality. Adoption of procedures that can extract the more labile fraction preferentially might be a more useful approach for the characterization of soil organic carbon resulting from different soils. This study aimed to evaluate organic carbon (C) fractions distribution in different soil layers up to 50 cm depth in two soil orders under cacao (Theobromacacao) agroforestry systems (AFS) in Bahia, Brazil. Soil samples were collected from four depth classes (0-5, 5-10, 10-30 and 30-50 cm) under two cacao agroforestry systems (30-year-old stands of cacao with Erythrina glauca, as shade trees) in Latosol and Cambisol, in Bahia, Brazil. The determination of oxidizable carbon by a modified Walkley-Black method was done to obtain four C fractions with different labile forms of C (fraction 1: labile fraction; fraction 2: moderate labile fraction; fraction 3: low labile fraction and fraction 4: recalcitrant fraction). Overall, at two cacao AFS, the C fractions generally declined with increase in soil depth. The C fractions 1 and 2 were 50% higher on upper layers (0-5 and 5-10 cm). More than 50% of organic C was found in more labile fraction (fraction 1) in all depths for both soils. High value of C fraction 1 (more labile C)-to-total organic C ratio was obtained (around 54-59%, on Latosol and Cambisol, respectively), indicating large input of organic matter in these soils.	
Palavras-Chave: 	Carbono lábil; Qualidade do carbono; Sequestro de carbono.	
Thesagro: 	Cacau; Erythrina Glauca.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (15242-1) - UPC - AP - DD -  -  - 2010.00049 - DIS