Data/hora: 07/06/2024 05:45:06

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