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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 |
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.
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Registros recuperados : 44 | |
1. | | FIGUEIREDO, R. de O.; MARKEWITZ, D. Hidrogeoquímica de um córrego amazônico: o caso de um igarapé na flona do Tapajós, Pará, Brasil. In: SEMINÁRIO DA REDE AGROHIDRO, 4., 2016, Brasília, DF. Água e agricultura: incertezas e desafios para a sustentabilidade frente às mudanças do clima e do uso da terra: anais. Planaltina, DF: Embrapa Cerrados, 2016. p. 114-121.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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7. | | 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.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Amazônia Oriental. |
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8. | | MARKEWITZ, D.; FIGUEIREDO, R. D.; MELAC, J. M.; NOVO, E.; RICHEY, J. E.; RICHEY, J. River corridors of the Amazon Basin and their response to Anthropogenic Change: A look back and a glimpse forward. In: MEETING OF THE AMERICAN, 2010, Foz do Iguaçu. Meeting of the Americas Abstracts... Washington, US: American Geophysical Union, 2010. Não paginado. U41B-04.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Amazônia Oriental. |
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10. | | PARRON, L. M.; BUSTAMANTE, M. M. C.; MARKEWITZ, D.; PRADO, C. L. Availability of Nutrients in Solutions in a Gallery Forest of Cerrado Biome. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Resumo 37.11-P.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Florestas. |
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11. | | JOSLIN, A.; MARKEWITZ, D.; MORRIS, L.; KATO, O. R.; FIGUEIREDO, R.; OLIVEIRA, F. de A. Crescimento de cinco espécies nativas em successão natural na Amazônia Oriental. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 8., 2011, Belém, PA. Anais... Belém, PA: SBSAF: Embrapa Amazônia Oriental: UFRA: CEPLAC: EMATER: ICRAF, 2011. 1 CD-ROM. Editores técnicos: Roberto Porro, Milton Kanashiro, Maria do Socorro Gonçalves Ferreira, Leila Sobral Sampaio e Gladys Ferreira de Sousa.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Amazônia Oriental. |
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16. | | NEILL, C.; ELSENBEER, H.; KRUSCHE, A. V.; LEHMANN, J.; MARKEWITZ, D.; FIGUEIREDO, R. de O. Hydrological and biogeochemical processes in a changing Amazon: results from small watershed studies and the large-scale biosphere-atmosphere experiment. Hydrological Processes, v. 20, n. 12, p. 2467-2476, Aug. 2006.Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
Biblioteca(s): Embrapa Amazônia Oriental. |
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