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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
24/12/2016 |
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Data da última atualização: |
24/12/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FREITAS, A. D. S. de; SAMPAIO, E. V. de S. B.; RAMOS, A. P. de S.; BARBOSA, M. R. de V.; LYRA, R. P.; ARAÚJO, E. L. |
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Afiliação: |
ANA DOLORES SANTIAGO DE FREITAS; EVERARDO VALADARES DE SÁ BARRETTO SAMPAIO; ANDRESA PRISCILA DE SOUZA RAMOS, CNPMF; MARIA REGINA DE VASCONCELLOS BARBOSA; ROSÂNGELA PEREIRA LYRA; ELCIDA LIMA ARAÚJO. |
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Título: |
Nitrogen isotopic patterns in tropical forests along a rainfall gradient in Northeast Brazil. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Plant Soil, v. 391, p.109?122, 2015. |
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ISSN: |
1573-5036 |
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Idioma: |
Inglês |
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Conteúdo: |
Background and aims The interpretation of ecosystem nitrogen isotopic patterns is subject to controversies since there are few surveys of signals along climate gradients within the same region. We determined the effects of a rainfall gradient, under high temperatures, on the soil and plant δ15N signals in Northeast Brazil. Methods Nitrogen, carbon and δ15N signals were determined from coastal perennial to subhumid and semiarid deciduous forests to savanna ? deciduous forest transition. Results Soil C and N concentrations were linearly related and both related quadratically with mean annual rainfall while δ15N concentrations decreased with higher rainfall (16 to 4?). Plant δ15N was 1?3? lower than soil δ15N (Δδ15N) in all areas. Only in the deciduous forests, leaves of target species had significantly lower 15 N signals than those of non-fixing species, allowing estimation of fixation. Conclusions In the perennial forests the low signals indicated that the 15 N natural abundance method was not suitable to estimate fixation, while in the savanna ? deciduous forest transition, high signals indicated that the legume species were not fixing. The smaller Δδ15N than those reported in cooler areas and the absence of rainfall effect indicates that, when high, temperature overrides the rainfall effect. |
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Thesagro: |
Nitrogênio. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01966naa a2200205 a 4500
001 2059260
005 2016-12-24
008 2015 bl uuuu u00u1 u #d
022 $a1573-5036
100 1 $aFREITAS, A. D. S. de
245 $aNitrogen isotopic patterns in tropical forests along a rainfall gradient in Northeast Brazil.$h[electronic resource]
260 $c2015
520 $aBackground and aims The interpretation of ecosystem nitrogen isotopic patterns is subject to controversies since there are few surveys of signals along climate gradients within the same region. We determined the effects of a rainfall gradient, under high temperatures, on the soil and plant δ15N signals in Northeast Brazil. Methods Nitrogen, carbon and δ15N signals were determined from coastal perennial to subhumid and semiarid deciduous forests to savanna ? deciduous forest transition. Results Soil C and N concentrations were linearly related and both related quadratically with mean annual rainfall while δ15N concentrations decreased with higher rainfall (16 to 4?). Plant δ15N was 1?3? lower than soil δ15N (Δδ15N) in all areas. Only in the deciduous forests, leaves of target species had significantly lower 15 N signals than those of non-fixing species, allowing estimation of fixation. Conclusions In the perennial forests the low signals indicated that the 15 N natural abundance method was not suitable to estimate fixation, while in the savanna ? deciduous forest transition, high signals indicated that the legume species were not fixing. The smaller Δδ15N than those reported in cooler areas and the absence of rainfall effect indicates that, when high, temperature overrides the rainfall effect.
650 $aNitrogênio
700 1 $aSAMPAIO, E. V. de S. B.
700 1 $aRAMOS, A. P. de S.
700 1 $aBARBOSA, M. R. de V.
700 1 $aLYRA, R. P.
700 1 $aARAÚJO, E. L.
773 $tPlant Soil$gv. 391, p.109?122, 2015.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Biblioteca |
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URL |
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Registro Completo
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
25/07/2023 |
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Data da última atualização: |
01/08/2023 |
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Tipo da produção científica: |
Artigo de Divulgação na Mídia |
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Autoria: |
CAMARA, J. A. da S.; PEREIRA, J. A.; SOBREIRA, R. dos S.; NASCIMENTO, H. T. S. do. |
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Afiliação: |
JOSE ALVES DA SILVA CAMARA, CPAMN; JOSE ALMEIDA PEREIRA, CPAMN; ROBERIO DOS SANTOS SOBREIRA, CPAMN; HOSTON TOMAS SANTOS DO NASCIMENTO, CPAMN. |
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Título: |
Agricultura familiar com inclusão social. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Página Rural. Disponível em: http://www.paginarural.com.br/artigos_detalhes.asp?subcategorial... Acesso em: 13 set. 2005. |
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Idioma: |
Português |
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Palavras-Chave: |
Maranhão. |
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Thesagro: |
Agricultura Familiar. |
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Categoria do assunto: |
B Sociologia Rural |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/254250/1/AgriculturaFamiliar-33812.pdf
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Marc: |
LEADER 00556nam a2200157 a 4500
001 2155272
005 2023-08-01
008 2005 bl uuuu u00u1 u #d
100 1 $aCAMARA, J. A. da S.
245 $aAgricultura familiar com inclusão social.$h[electronic resource]
260 $aPágina Rural. Disponível em: http://www.paginarural.com.br/artigos_detalhes.asp?subcategorial... Acesso em: 13 set. 2005.$c2005
650 $aAgricultura Familiar
653 $aMaranhão
700 1 $aPEREIRA, J. A.
700 1 $aSOBREIRA, R. dos S.
700 1 $aNASCIMENTO, H. T. S. do
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