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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
31/03/2009 |
Data da última atualização: |
22/11/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
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: |
-- |
Marc: |
LEADER 02107naa a2200241 a 4500 001 1410229 005 2022-11-22 008 2008 bl uuuu u00u1 u #d 100 1 $aMCGRODDY, M. E. 245 $aRetention of phosphorus in highly weathered soils under a lowland Amazonian forest ecosystem.$h[electronic resource] 260 $c2008 520 $aThe 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. 650 $aAmazonia 650 $aEcossistema 650 $aFertilidade do Solo 650 $aFósforo 650 $aSolo Florestal 653 $aBrasil 700 1 $aSILVER, W. L. 700 1 $aOLIVEIRA JUNIOR, R. C. de 700 1 $aMELLO, W. Z. de 700 1 $aKELLER, M. 773 $tJournal of geophysical Research$gv. 113, n. G4, p. 1-11, Dec. 2008.
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