Data/hora: 31/05/2024 09:21:08

Biblioteca(s): 	Embrapa Amazônia Oriental.	
Data corrente: 	31/03/2009	
Data da última atualização: 	22/11/2022	
Autoria: 	MCGRODDY, M. E.; SILVER, W. L.; OLIVEIRA JUNIOR, R. C. de; MELLO, W. Z. de; KELLER, M.	
Afiliação: 	M. E. McGroddy, Department of Environmental Studies, Policy, and Management, University of California, Berkeley, California, USA; W. L. Silver, Department of Environmental Studies, Policy, and Management, University of California, Berkeley, California, USA; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; W. Z. de Mello, Instituto de Química, Departamento de Geoquímica, Universidade Federal Fluminense, Niteroi, Brazil; M. Keller, International Institute of Tropical Forestry, Forest Service, U.S. Department of Agriculture, San Juan, Puerto Rico, USA.	
Título: 	Retention of phosphorus in highly weathered soils under a lowland Amazonian forest ecosystem.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	Journal of geophysical Research, v. 113, n. G4, p. 1-11, Dec. 2008.	
Idioma: 	Inglês	
Conteúdo: 	The low available phosphorus (P) pools typical of highly weathered tropical forest soils are thought to result from a combination of export of phosphorus via erosion and leaching as well as chemical reactions resulting in physically and chemically protected P compounds. Despite the low apparent P availability, these soils support some of the highest terrestrial net primary productivity globally. We followed different P fractions after P additions to two soil types, sandy loam and sandy clay, over 1 year in a lowland Amazonian forest. Of all the soil P fractions measured, only the NaHCO3 and NaOH extractable fractions showed a significant increase following P additions, and this occurred only in sandy clays (+ 56.9 ± 15.1 kg ha-1 and + 2.8 ± 1.5 kg ha-1, respectively). Our results indicate that intermediate rather than recalcitrant pools are the dominant fate of added P over an annual timescale even in fine-textured soils. Fine root and forest floor P pools increased more in the sandy loams following P additions suggesting a larger biotic P sink in these soils. Leaching of inorganic P from the surface soils was an unexpected and significant fate of added P in both soil types (9 ± 3% in the sandy loams, 2 ± 1% in the sandy clays). Significantly more of the added P was retained in the sandy clay soils than in the sandy loams (69 ± 20% versus 33 ± 7%) over the 1-year period.	
Palavras-Chave: 	Brasil.	
Thesagro: 	Ecossistema; Fertilidade do Solo; Fósforo; Solo Florestal.	
Thesaurus Nal: 	Amazonia.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Amazônia Oriental (CPATU)	
Exemplares: 	CPATU - (40943-1) - UPC - AP - DD -  -  -  - DIS