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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
19/11/1999 |
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Data da última atualização: |
19/11/1999 |
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Autoria: |
NADELHOFFER, K.; SHAVER, G.; FRY, B.; GIBLIN, A.; JOHNSON, L.; MCKANE, R. |
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Título: |
15N natural abundances and N use by tundra plants. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
Oecologia, Netherlands, v. 107, p. 386-394, 1996. |
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Idioma: |
Inglês |
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Conteúdo: |
Plant species collected from tundra ecosystems located along a north-south transect from central Alaska to the north coast of Alaska showed large and consistent differences in 15N natural abundances. Foliar 15N values varied by about 10% among species within each of two moist tussock tundra sites. Differences in 15N contents among species or plant groups were consistent across moist tussock tundra at several other sites and across five other tundra types at a single site. Ericaceous species had the lowest 15N values, ranging between about -8 to -6%. Foliar 15N contents increased progressively in birch, willows and sedges to maximum 15N values of about +2% in sedges. Soil 15N contents in tundra ecosystems at our two most intensively studied sites increased with depth and 15N values were usually higher for soils than for plants. Isotopic fractionations during soil N transformations and possibly during plant N uptake could lead to observed differences in 15N contents among plant species and between plants and soils. Patterns of variation in 15N content among species indicate that tundra plants acquire nitrogenin extremely nutrient-poor environments by competitive partitioning of the overall N pool. Differences in plant N sources, rooting depth, mycorrhizal associations, forms of N taken up, and other factors controlling plant N uptake are possible causes of variations in 15N values of tundra plant species. |
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Palavras-Chave: |
Cycling and Nitrogen; Isotopez; Plants. |
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Thesagro: |
Ciclo do Nitrogênio; Isótopo; Nitrato Redutase; Planta; Solo. |
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Thesaurus Nal: |
nitrate reductase; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02168naa a2200301 a 4500
001 1621117
005 1999-11-19
008 1996 bl --- 0-- u #d
100 1 $aNADELHOFFER, K.
245 $a15N natural abundances and N use by tundra plants.
260 $c1996
520 $aPlant species collected from tundra ecosystems located along a north-south transect from central Alaska to the north coast of Alaska showed large and consistent differences in 15N natural abundances. Foliar 15N values varied by about 10% among species within each of two moist tussock tundra sites. Differences in 15N contents among species or plant groups were consistent across moist tussock tundra at several other sites and across five other tundra types at a single site. Ericaceous species had the lowest 15N values, ranging between about -8 to -6%. Foliar 15N contents increased progressively in birch, willows and sedges to maximum 15N values of about +2% in sedges. Soil 15N contents in tundra ecosystems at our two most intensively studied sites increased with depth and 15N values were usually higher for soils than for plants. Isotopic fractionations during soil N transformations and possibly during plant N uptake could lead to observed differences in 15N contents among plant species and between plants and soils. Patterns of variation in 15N content among species indicate that tundra plants acquire nitrogenin extremely nutrient-poor environments by competitive partitioning of the overall N pool. Differences in plant N sources, rooting depth, mycorrhizal associations, forms of N taken up, and other factors controlling plant N uptake are possible causes of variations in 15N values of tundra plant species.
650 $anitrate reductase
650 $asoil
650 $aCiclo do Nitrogênio
650 $aIsótopo
650 $aNitrato Redutase
650 $aPlanta
650 $aSolo
653 $aCycling and Nitrogen
653 $aIsotopez
653 $aPlants
700 1 $aSHAVER, G.
700 1 $aFRY, B.
700 1 $aGIBLIN, A.
700 1 $aJOHNSON, L.
700 1 $aMCKANE, R.
773 $tOecologia, Netherlands$gv. 107, p. 386-394, 1996.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Hortaliças. Para informações adicionais entre em contato com cnph.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Hortaliças. |
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Data corrente: |
09/03/2010 |
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Data da última atualização: |
09/03/2010 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
LOPES, S. B.; FERREIRA, N. A.; CARVALHO, P. G. B.; MORETTI, C. L.; RIBEIRO, R. L. V. |
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Afiliação: |
Patricia Gonçalves B. Carvalho, Embrapa Hortaliças; Celso Luiz Moretti, Embrapa Hortaliças; Ricardo Luiz Vasconcelos Ribeiro, Embrapa Hortaliças. |
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Título: |
Obtenção e caracterização físico-química da farinha do resíduo do processamento mínimo de mini cenouras. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: SIMPÓSIO LATINO AMERICANO DE CIÊNCIA DE ALIMENTOS, 8., 2009, Campinas. Ciência de alimentos no mundo globalizado: novos desafios, novas perspectivas. Campinas: Unicamp, 2009. |
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Descrição Física: |
CD-ROM. |
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Idioma: |
Português |
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Notas: |
Resumo 3271. |
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Palavras-Chave: |
Mini cenoura; Produto minimamente processado. |
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Thesagro: |
Análise Física; Análise Química; Beta Vulgaris; Cenoura; Farinha; Processamento Mínimo; Resíduo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00968naa a2200289 a 4500
001 1781587
005 2010-03-09
008 2009 bl uuuu u00u1 u #d
100 1 $aLOPES, S. B.
245 $aObtenção e caracterização físico-química da farinha do resíduo do processamento mínimo de mini cenouras.
260 $c2009
300 $cCD-ROM.
500 $aResumo 3271.
650 $aAnálise Física
650 $aAnálise Química
650 $aBeta Vulgaris
650 $aCenoura
650 $aFarinha
650 $aProcessamento Mínimo
650 $aResíduo
653 $aMini cenoura
653 $aProduto minimamente processado
700 1 $aFERREIRA, N. A.
700 1 $aCARVALHO, P. G. B.
700 1 $aMORETTI, C. L.
700 1 $aRIBEIRO, R. L. V.
773 $tIn: SIMPÓSIO LATINO AMERICANO DE CIÊNCIA DE ALIMENTOS, 8., 2009, Campinas. Ciência de alimentos no mundo globalizado: novos desafios, novas perspectivas. Campinas: Unicamp, 2009.
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