Data/hora: 11/06/2024 03:27:58

Provedor de dados: 	90	
País: 	Brazil	
Título: 	Soil carbon and nitrogen in pasture soil reforested with eucalyptus and guachapele	
Autores: 	Balieiro,Fabiano de Carvalho; Pereira,Marcos Gervasio; Alves,Bruno José Rodrigues; Resende,Alexander Silva de; Franco,Avílio Antonio.	
Data: 	2008-06-01	
Ano: 	2008	
Palavras-chave: 	Mixed plantations; Pseudosamanea guachapele; Eucalyptus grandis; Soil organic matter; 13C natural abundance.	
Resumo: 	In spite of the normally low content of organic matter found in sandy soils, it is responsible for almost the totality of cation exchange capacity (CEC), water storage and availability of plant nutrients. It is therefore important to evaluate the impact of alternative forest exploitation on the improvement of soil C and N accumulation on these soils. This study compared pure and mixed plantations of Eucalyptus grandis and Pseudosamanea guachapele, a N2-fixing leguminous tree, in relation to their effects on soil C and N stocks. The studied Planosol area had formerly been covered by Panicum maximum pasture for at least ten years without any fertilizer addition. To estimate C and N contents, the soil was sampled (at depths of 0-2.5; 2.5-5.0; 5.0-7.5; 7.5-10.0; 10.0-20.0 and 20.0-40.0 cm), in pure and mixed five-year-old tree plantations, as well as on adjacent pasture. The natural abundance 13C technique was used to estimate the contribution of the soil organic C originated from the trees in the 0-10 cm soil layer. Soil C and N stocks under mixed plantation were 23.83 and 1.74 Mg ha-1, respectively. Under guachapele, eucalyptus and pasture areas C stocks were 14.20, 17.19 and 24.24 Mg ha-1, respectively. For these same treatments, total N contents were 0.83; 0.99 and 1.71 Mg ha-1, respectively. Up to 40 % of the soil organic C in the mixed plantation was estimated to be derived from trees, while in pure eucalyptus and guachapele plantations these same estimates were only 19 and 27 %, respectively. Our results revealed the benefits of intercropped leguminous trees in eucalyptus plantations on soil C and N stocks.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000300033	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/S0100-06832008000300033	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.32 n.3 2008	
Fonte: 	info:eu-repo/semantics/openAccess