|
|
Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
22/12/1999 |
Data da última atualização: |
10/04/2007 |
Autoria: |
MARTIN-NETO, L.; ROSELL, R.; SPOSITO, G. |
Afiliação: |
EMBRAPA-CNPDIA; Universidad Nacional del Sur-Departamento de Agronomia-LAHBIS; University of California-Ecosystem Sciences. |
Título: |
Correlation of spectroscopic indicators of humification with mean annual rainfall along a temperate grassland climosequence. |
Ano de publicação: |
1998 |
Fonte/Imprenta: |
Geoderma, Amsterdam, v. 81, n. 3/4, p. 305-311, Jan., 1998. |
Idioma: |
Inglês |
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. |
Palavras-Chave: |
Climosequence; Climosequencia; Pampean region; Radicais livres; Regiao dos Pampas. |
Thesagro: |
Húmus; Matéria Orgânica; Solo. |
Thesaurus Nal: |
free radicals; organic matter; soil. |
Categoria do assunto: |
-- |
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.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Instrumentação (CNPDIA) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
Registros recuperados : 3 | |
1. | | SOUZA, F. S. de; OLIVEIRA, E. J. F. de; RIBEIRO, M. de F.; SOUZA, B. de A.; COSTA, M. A. P. de C.; CARVALHO, C. A. L. de. Genetic divergence in island and continental populations of Melipona subnitida, in the Northeast of Brazil: analysis of mitochondrial DNA. In: ENCONTRO SOBRE ABELHAS, 11., 2015, Ribeirão Preto. Anais... Ribeirão Preto: USP: FCLRP, 2015. p. 301.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio-Norte. |
| |
2. | | SOUZA, F. S. de; OLIVEIRA, E. J. F. de; RIBEIRO, M. de F.; SOUZA, B. de A.; COSTA, M. A. P. de C.; CARVALHO, C. A. L. de. Genetic divergence in island and continental populations of Melipona subnitida, in the Northeast of Brazil: analysis of mitochondrial DNA. In: ENCONTRO SOBRE ABELHAS, 11., 2015, Ribeirão Preto. Anais... Ribeirão Preto: USP: FCLRP, 2015. p. 301.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Semiárido. |
| |
3. | | SOUZA, F. S. de; COSTA, M. A. P. de C.; OLIVEIRA, E. J. F. de; RIBEIRO, M. de F.; SOUZA, B. de A.; ARAÚJO, E. D.; IMPERATRIZ-FONSECA, V. L.; CARVALHO, C. A. L. de. Genetic variability of Melipona subnitida (Hymenoptera: Apidae) in introduced and native populations. Journal of Insect Science, v. 18, n. 5, p. 1-6, 2018.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
Biblioteca(s): Embrapa Meio-Norte; Embrapa Semiárido. |
| |
Registros recuperados : 3 | |
|
Expressão de busca inválida. Verifique!!! |
|
|