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| Registros recuperados : 62 | |
| 11. |  | FIGUEIREDO, R. de O.; SOUSA, K. de A.; MARKEWITZ, D.; DAVIDSON, E. A. Alterações nas concentrações de ortofosfato em amostras de chuva, throughfall e litter leachate armazenadas em coletores instalados em área experimental na Floresta Nacional do Tapajós. In: CONGRESSO DE ECOLOGIA DO BRASIL, 6., 2003, Fortaleza, CE. Anais de trabalhos completos. Fortaleza: Universidade Federal do Ceará, 2003. p. 676-678.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 12. | | FREIRE, G. S.; SANTOS, M. T. P. dos; SÁ, T. D. de A.; DAVIDSON, E. A. Características qualitativas da chuva sob dossel em vegetações secundárias sucedendo diferentes usos da terra no nordeste do Pará. In: CONGRESSO DE ESTUDANTES E BOLSISTAS DO EXPERIMENTO LBA, 1., 2002, Belém, PA. Resumos. Belém, PA: LBA, 2002. p. 30.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 62 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio Ambiente. Para informações adicionais entre em contato com cnpma.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Meio Ambiente. |
|
Data corrente: |
10/02/2012 |
|
Data da última atualização: |
07/08/2012 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
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Autoria: |
MARKEWITZ, D.; FIGUEIREDO, R. de O.; CARVALHO, C. J. R. de; DAVIDSON, E. A. |
|
Afiliação: |
DANIEL MARKEWITZ, University of Georgia; RICARDO DE OLIVEIRA FIGUEIREDO, CNPMA; CLAUDIO JOSE REIS DE CARVALHO, CPATU; ERIC A. DAVIDSON, Woods Hole Research Center. |
|
Título: |
Soil and tree response to P fertilization in a secondary tropical forest supported by an Oxisol. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Biology and Fertility of Soils, Berlin, v. 48, 2011. |
|
Idioma: |
Inglês |
|
Conteúdo: |
Abstract: Abstract Mature tropical forests are considered to be P
limited and to cycle P efficiently. Whether P limitations
are significant in younger secondary tropical forests, how-
ever, remains largely unexplored. This study evaluated P
limitation by observing the P fertilizer response of a natu-
rally regenerated 24-year-old forest and its soil. In February
1999, six 20×20-m plots were established in secondary
forest in the Brazilian Amazon. After 1 year of pre-
treatment tree measurements, 50 kg Pha-1 was applied in
January 2000 and again in January 2001. Soil sorption of P
was relatively low (~100 micrograms g-1) in the surface 0–20 cm
while sorption increased to ~180 micrograms g-1 at 20–50 cm and
approached ~500 micrograms g-1 for the 50- to 200-cm layers. Soil P
in 0–10 cm, measured as sequentially extractable fractions
(resin, HCO3-Pi, NaOH-Pi, NaOH-Po, and 1 M HCl), in-
creased shortly after fertilization and could account for
nearly all the 50 kg Pha-1 added at each date. During the
following 6 years, soil P in fertilized plots declined in all
pools other than resin P, and by June 2006, concentrations
returned to pre-fertilization levels. Despite the increase in
extractable P with fertilization, increased tree growth was
not detected from stand age 25 to 31 years. It appears that
during secondary forest succession at this site, the forest P
cycle was conservative so as to maintain available P at a
sufficient concentration to meet forest P demands. |
|
Palavras-Chave: |
Fracionamento de fósforo; Limitação de fósforo; Sorção de fósforo. |
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Thesagro: |
Fertilidade do solo; Floresta secundária; Floresta tropical; Fósforo. |
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Thesaurus NAL: |
Amazonia; Phosphorus fertilizers; Rain forests; Secondary forests; Soil fertility. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
Marc: |
LEADER 02404naa a2200301 a 4500
001 1915112
005 2012-08-07
008 2011 bl uuuu u00u1 u #d
100 1 $aMARKEWITZ, D.
245 $aSoil and tree response to P fertilization in a secondary tropical forest supported by an Oxisol.$h[electronic resource]
260 $c2011
520 $aAbstract: Abstract Mature tropical forests are considered to be P limited and to cycle P efficiently. Whether P limitations are significant in younger secondary tropical forests, how- ever, remains largely unexplored. This study evaluated P limitation by observing the P fertilizer response of a natu- rally regenerated 24-year-old forest and its soil. In February 1999, six 20×20-m plots were established in secondary forest in the Brazilian Amazon. After 1 year of pre- treatment tree measurements, 50 kg Pha-1 was applied in January 2000 and again in January 2001. Soil sorption of P was relatively low (~100 micrograms g-1) in the surface 0–20 cm while sorption increased to ~180 micrograms g-1 at 20–50 cm and approached ~500 micrograms g-1 for the 50- to 200-cm layers. Soil P in 0–10 cm, measured as sequentially extractable fractions (resin, HCO3-Pi, NaOH-Pi, NaOH-Po, and 1 M HCl), in- creased shortly after fertilization and could account for nearly all the 50 kg Pha-1 added at each date. During the following 6 years, soil P in fertilized plots declined in all pools other than resin P, and by June 2006, concentrations returned to pre-fertilization levels. Despite the increase in extractable P with fertilization, increased tree growth was not detected from stand age 25 to 31 years. It appears that during secondary forest succession at this site, the forest P cycle was conservative so as to maintain available P at a sufficient concentration to meet forest P demands.
650 $aAmazonia
650 $aPhosphorus fertilizers
650 $aRain forests
650 $aSecondary forests
650 $aSoil fertility
650 $aFertilidade do solo
650 $aFloresta secundária
650 $aFloresta tropical
650 $aFósforo
653 $aFracionamento de fósforo
653 $aLimitação de fósforo
653 $aSorção de fósforo
700 1 $aFIGUEIREDO, R. de O.
700 1 $aCARVALHO, C. J. R. de
700 1 $aDAVIDSON, E. A.
773 $tBiology and Fertility of Soils, Berlin$gv. 48, 2011.
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