Data/hora: 21/06/2024 16:48:03

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