Data/hora: 05/06/2024 17:04:43

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: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (5043-1) - UPC - SP - -- - PROCI-98.00114 -  - 1998.00114 - DIS