Data/hora: 02/06/2024 13:09:17

Provedor de dados: 	90	
País: 	Brazil	
Título: 	Soil carbon and nitrogen stocks in traditional agricultural and agroforestry systems in the semiarid region of Brazil	
Autores: 	Sacramento,José Augusto Amorim Silva do; Araújo,Ana Caroline de Moraes; Escobar,Maria Eugenia Ortiz; Xavier,Francisco Alisson da Silva; Cavalcante,Ana Clara Rodrigues; Oliveira,Teógenes Senna de.	
Data: 	2013-06-01	
Ano: 	2013	
Palavras-chave: 	Carbon sequestration; Conservation management; Shifting cultivation.	
Resumo: 	In the semiarid region of Brazil, inadequate management of cropping systems and low plant biomass production can contribute to reduce soil carbon (C) and nitrogen (N) stocks; therefore, management systems that preserve C and N must be adopted. This study aimed to evaluate the changes in soil C and N stocks that were promoted by agroforestry (agrosilvopastoral and silvopastoral) and traditional agricultural systems (slash-and-burn clearing and cultivation for two and three years) and to compare these systems with the natural Caatinga vegetation after 13 years of cultivation. The experiment was carried out on a typical Ortic Chromic Luvisol in the municipality of Sobral, Ceará, Brazil. Soil samples were collected (layers 0-6, 6-12, 12-20, 20-40 and 40-60 cm) with four replications. The plain, convex and concave landforms in each study situation were analyzed, and the total organic C, total N and densities of the soil samples were assessed. The silvopastoral system promoted the greatest long-term reductions in C and N stocks, while the agrosilvopastoral system promoted the smallest losses and therefore represents a sustainable alternative for soil C and N sequestration in these semiarid conditions. The traditional agricultural system produced reductions of 58.87 and 9.57 Mg ha-1 in the organic C and total N stocks, respectively, which suggests that this system is inadequate for these semiarid conditions. The organic C stocks were largest in the concave landform in the agrosilvopastoral system and in the plain landform in the silvopastoral system, while the total N values were highest in the concave landform in the native, agrosilvopastoral and silvopastoral systems.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300025	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/S0100-06832013000300025	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.37 n.3 2013	
Fonte: 	info:eu-repo/semantics/openAccess