Data/hora: 24/06/2024 08:21:23

Biblioteca(s): 	Embrapa Cerrados.	
Data corrente: 	17/03/2005	
Data da última atualização: 	17/03/2005	
Autoria: 	LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; VILELA, L.; LIMA, S. do C.; ZECK, W.	
Título: 	Soil acidification in Pinus caribaea forests on Brazilian savanna oxisols.	
Ano de publicação: 	2000	
Fonte/Imprenta: 	Forest Ecology and Management, Amsterdam, v. 128, p. 145-157, 2000.	
Idioma: 	Inglês	
Conteúdo: 	The transformation of large areas in the Brazilian savanna into Pinus Plantations may have resultedin soil acidification. The objective of this study was to determine if afforestation with Pinus caribea Morelet (PI) influenced soil acidigication by comparing the status of the silod phase and of metal consentrations in soil solution during one rainy season with those under natural savanna vegetation ( Cerrado, CE). Surface soil samples (0-015 m ) from three spatially disconected plots in CE and PI were sequentially extracted. At each plot, soil solution at 0.15, 0.3, 0.8, 1.2, and 2 m deph and in PI additionally litter leachate were collected between October 1997 and April 1998. Extracts and soil solution were analyzed for Al, Ca, Cu, Fe, K Mg, Mn, Na, Si, and Zn concentration, soil solution also for pH and electrical conductivity (EC). total concentration in soil solid phase ranged between 94 000 and 155 000 mg -¹ (Al), 29 and 39 (Ca), 21 and 31(Cu), 44 000 and 61 000 (Fe), 91 and 141 (K) 21 and 29 (Mg), 28 and 57 (Mn), 73 and 94 (Na), and 13 and 21 (Zn). Whereas 27- 83% of total K , Ca Mg, and Na concentrations were exchangeable, >83% of total Cu, Fe, Mn, and Al were bound in hardlly plant- available forms. There were no significant differences in concentrations and partitioning between  CE and PI. At the beginning of the rainy season (October to December), metal concetrations in soil solution were 2-5 times larger and more variable than between December and April because of the organic matter which accumulated during the dry season. Metal concentration in CE soil solution between  December and April were extremily small at all dephs ( Al: not detect (n.d.) _ 3.26 mol 1-¹, Ca: 2.8 - 11.7, K: 0.9 - 6.7, Mg: 0.7 - 8.3, Mn: n.d. - 0. 14, Na: 5.5 - 40.1, Zn: 0.13 - 1.02 ). Up to 1.2 m soil depth,  soil solution pH was significantly lower in PI than in CE. Concentrations of Ca, K,  Mg, and Na were up to twotimes larger than in CE, those of Mn and Al 9 and 60 times, respectively. whereas the soil solid phase did not show significant differences in metal concentrations and partitioning, the sooil solution composition clearly  indicated enhaced acidification in PI. This resulted in increased leanching of plant nutrients from the topsoil. 2000 Elsevier Science B. V. All rights reserved.  	
Palavras-Chave: 	Cewrrado.	
Thesagro: 	Acidificação; Solo.	
Thesaurus Nal: 	Pinus.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CPAC - (25764-1) - UPC - AP - -- - CRI6679 -  - CRI6679 - DIS