| |
|
|
| Registros recuperados : 116 | |
| Registros recuperados : 116 | |
|
|
|
 | 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: |
26/07/2018 |
|
Data da última atualização: |
26/07/2018 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
DAVIDSON, E. A.; MARKEWITZ, D.; FIGUEIREDO, R. de O.; CAMARGO, P. B. de. |
|
Afiliação: |
ERIC A DAVIDSON, University of Maryland Center for Environmental Science; DANIEL MARKEWITZ, University of Georgia; RICARDO DE OLIVEIRA FIGUEIREDO, CNPMA; PLINIO BARBOSA DE CAMARGO, CENA-USP. |
|
Título: |
Nitrogen fixation inputs in pasture and early successional forest in the Brazilian Amazon region: evidence from a claybox mesocosm study. |
|
Ano de publicação: |
2018 |
|
Fonte/Imprenta: |
Journal of Geophysical Research: Biogeosciences, v. 123, n. 2, p. 712-721, 2018. |
|
DOI: |
https://doi.org/10.1002/2017JG004103 |
|
Idioma: |
Inglês |
|
Conteúdo: |
The role of biological nitrogen fixation (BNF) during secondary forest succession and in tropical pastures has been investigated and debated for several decades. Here we present results of a replicated experimental study in a degraded cattle pasture of eastern Amazonia using mass balance and a 15N tracer in lined soil pit mesocosms with three treatments: (1) plant-free control plots, (2) pasture grass Brachiaria brizantha, and (3) regrowth of early successional secondary forest species. Accumulation of N in grass biomass slightly exceeded estimates of net N mineralization from the plant-free control plots but was within the margin of error, so inputs of BNF may not have been needed. In contrast, the secondary forest vegetation accumulated about 3 times as much biomass N annually as the net N mineralization estimate, suggesting at least some role for BNF. Based on isotopic and mass measurements of N-fixing species, BNF was estimated to contribute at least 27 ± 3% of mean annual plant uptake in the secondary forest regrowth vegetation plots. Although BNF is probably important for recuperation of tropical secondary forests following land use change, the majority of the N taken up by both grasses and secondary forest regrowth arose from mineralization of the stocks of soil N. |
|
Thesagro: |
Argila; Fixação de nitrogênio; Floresta secundária; Pastagem. |
|
Thesaurus NAL: |
Clay; Forest succession; Nitrogen fixation; Tropical pastures. |
|
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
Marc: |
LEADER 02167naa a2200265 a 4500
001 2093599
005 2018-07-26
008 2018 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1002/2017JG004103$2DOI
100 1 $aDAVIDSON, E. A.
245 $aNitrogen fixation inputs in pasture and early successional forest in the Brazilian Amazon region$bevidence from a claybox mesocosm study.$h[electronic resource]
260 $c2018
520 $aThe role of biological nitrogen fixation (BNF) during secondary forest succession and in tropical pastures has been investigated and debated for several decades. Here we present results of a replicated experimental study in a degraded cattle pasture of eastern Amazonia using mass balance and a 15N tracer in lined soil pit mesocosms with three treatments: (1) plant-free control plots, (2) pasture grass Brachiaria brizantha, and (3) regrowth of early successional secondary forest species. Accumulation of N in grass biomass slightly exceeded estimates of net N mineralization from the plant-free control plots but was within the margin of error, so inputs of BNF may not have been needed. In contrast, the secondary forest vegetation accumulated about 3 times as much biomass N annually as the net N mineralization estimate, suggesting at least some role for BNF. Based on isotopic and mass measurements of N-fixing species, BNF was estimated to contribute at least 27 ± 3% of mean annual plant uptake in the secondary forest regrowth vegetation plots. Although BNF is probably important for recuperation of tropical secondary forests following land use change, the majority of the N taken up by both grasses and secondary forest regrowth arose from mineralization of the stocks of soil N.
650 $aClay
650 $aForest succession
650 $aNitrogen fixation
650 $aTropical pastures
650 $aArgila
650 $aFixação de nitrogênio
650 $aFloresta secundária
650 $aPastagem
700 1 $aMARKEWITZ, D.
700 1 $aFIGUEIREDO, R. de O.
700 1 $aCAMARGO, P. B. de
773 $tJournal of Geophysical Research: Biogeosciences$gv. 123, n. 2, p. 712-721, 2018.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Meio Ambiente (CNPMA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
