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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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Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
Biblioteca(s): |
Embrapa Agroindústria Tropical. |
Data corrente: |
18/01/2019 |
Data da última atualização: |
29/01/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
TEIXEIRA, M. V. S.; LIMA, J. Q.; PIMENTA, A. T. A.; SILVA, F. R. L.; OLIVEIRA, M. C. F. O.; PEREIRA, I. G.; JUNIOR, D. C. C.; RIBEIRO, P. R. V.; SANTIAGO, G. M. P.; LIMA, M. A. S.; BRAZ-FILHO, R.; BEZERRA, M. M.; MONTENEGRO, R. C.; ROCHA, D. D.; MORAES, M. E. A. de; MEDEIROS, A. C.; ARRIAGA, A. M. C. |
Afiliação: |
Maria V.S. Teixeira, Universidade Federal do Ceará - UFC; Jefferson Q. Lima, Instituto Federal de Educação, Ciência e Tecnologia do Ceará - IFCE; Antônia T.A. Pimenta, Universidade Federal do Ceará - UFC; Francisca R.L. da Silva, Universidade Federal do Ceará - UFC; Maria da Conceição F. de Oliveira, Universidade Federal do Ceará - UFC; Italo G. Pereira, Universidade Federal do Ceará - UFC; Dilailson C. Costa-Junior, Universidade Federal do Ceará - UFC; PAULO RICELI VASCONCELOS RIBEIRO, CNPAT; Gilvandete M.P. Santiago, Universidade Federal do Ceará - UFC; Mary Anne S. Lima, Universidade Federal do Ceará - UFC; Raimundo Braz-Filho, Universidade Federal Rural do Rio de Janeiro (UFRRJ) e Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF); Mirna M. Bezerra, Universidade Federal do Ceará - UFC; Raquel C. Montenegro, Universidade Federal do Ceará - UFC; Danilo D. Rocha, Universidade Federal do Ceará - UFC; Maria Elisabete A. de Moraes, Universidade Federal do Ceará - UFC; Aline C. de Medeiros, Universidade Federal do Ceará - UFC; Angela M.C. Arriaga, Universidade Federal do Ceará - UFC. |
Título: |
New flavone and other compounds from Tephrosia egregia: assessing the cytotoxic effect on human tumor cell lines. |
Ano de publicação: |
2018 |
Fonte/Imprenta: |
Revista Brasileira de Farmacognosia, Curitiba, v. 28, n. 3, p. 333-338, 2018. |
Idioma: |
Inglês |
Palavras-Chave: |
Células. |
Thesagro: |
Tephrosia; Tumor. |
Thesaurus NAL: |
Cytotoxicity; Flavones. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/191296/1/ART18121.pdf
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Marc: |
LEADER 01075naa a2200361 a 4500 001 2104510 005 2019-01-29 008 2018 bl uuuu u00u1 u #d 100 1 $aTEIXEIRA, M. V. S. 245 $aNew flavone and other compounds from Tephrosia egregia$bassessing the cytotoxic effect on human tumor cell lines.$h[electronic resource] 260 $c2018 650 $aCytotoxicity 650 $aFlavones 650 $aTephrosia 650 $aTumor 653 $aCélulas 700 1 $aLIMA, J. Q. 700 1 $aPIMENTA, A. T. A. 700 1 $aSILVA, F. R. L. 700 1 $aOLIVEIRA, M. C. F. O. 700 1 $aPEREIRA, I. G. 700 1 $aJUNIOR, D. C. C. 700 1 $aRIBEIRO, P. R. V. 700 1 $aSANTIAGO, G. M. P. 700 1 $aLIMA, M. A. S. 700 1 $aBRAZ-FILHO, R. 700 1 $aBEZERRA, M. M. 700 1 $aMONTENEGRO, R. C. 700 1 $aROCHA, D. D. 700 1 $aMORAES, M. E. A. de 700 1 $aMEDEIROS, A. C. 700 1 $aARRIAGA, A. M. C. 773 $tRevista Brasileira de Farmacognosia, Curitiba$gv. 28, n. 3, p. 333-338, 2018.
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