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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
10/04/2007 |
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Autoria: |
MARTIN-NETO, L.; ROSELL, R.; SPOSITO, G. |
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Afiliação: |
EMBRAPA-CNPDIA; Universidad Nacional del Sur-Departamento de Agronomia-LAHBIS; University of California-Ecosystem Sciences. |
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Título: |
Correlation of spectroscopic indicators of humification with mean annual rainfall along a temperate grassland climosequence. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 81, n. 3/4, p. 305-311, Jan., 1998. |
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Idioma: |
Inglês |
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Conteúdo: |
The stable free radical concentration, as measured by electron spin resonance spectroscopy, and the E4/E6 absorbance ratio were for a suite of humic acids extracted from uncultivated surface soils collected along a 620 km climosequence in the Argentine Pampa (mean annual temperature, 14-15§C; mean annual rainfall, 300-100 mm). These two spectroscopic properties were interpreted as indicators of the degree of humification of soil organic matter, with free radical concentration expected to increase and the E4/E6 ratio to decrease with greater humification. Both the free radical concentration and the E4/E6 ratio were found to be significantly correlated with increasing mean annual rainfall, which was accompanied by an increase in the stable free radical concentration and a decrease in the E4/E6 ratio. Our results indicate that, in the sequence of temperate grassland soils investigated, organic matter humification increased with increasing rainfall. |
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Palavras-Chave: |
Climosequence; Climosequencia; Pampean region; Radicais livres; Regiao dos Pampas. |
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Thesagro: |
Húmus; Matéria Orgânica; Solo. |
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Thesaurus Nal: |
free radicals; organic matter; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01743naa a2200277 a 4500
001 1026427
005 2007-04-10
008 1998 bl --- 0-- u #d
100 1 $aMARTIN-NETO, L.
245 $aCorrelation of spectroscopic indicators of humification with mean annual rainfall along a temperate grassland climosequence.
260 $c1998
520 $aThe stable free radical concentration, as measured by electron spin resonance spectroscopy, and the E4/E6 absorbance ratio were for a suite of humic acids extracted from uncultivated surface soils collected along a 620 km climosequence in the Argentine Pampa (mean annual temperature, 14-15§C; mean annual rainfall, 300-100 mm). These two spectroscopic properties were interpreted as indicators of the degree of humification of soil organic matter, with free radical concentration expected to increase and the E4/E6 ratio to decrease with greater humification. Both the free radical concentration and the E4/E6 ratio were found to be significantly correlated with increasing mean annual rainfall, which was accompanied by an increase in the stable free radical concentration and a decrease in the E4/E6 ratio. Our results indicate that, in the sequence of temperate grassland soils investigated, organic matter humification increased with increasing rainfall.
650 $afree radicals
650 $aorganic matter
650 $asoil
650 $aHúmus
650 $aMatéria Orgânica
650 $aSolo
653 $aClimosequence
653 $aClimosequencia
653 $aPampean region
653 $aRadicais livres
653 $aRegiao dos Pampas
700 1 $aROSELL, R.
700 1 $aSPOSITO, G.
773 $tGeoderma, Amsterdam$gv. 81, n. 3/4, p. 305-311, Jan., 1998.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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