Data/hora: 04/06/2024 04:26:05

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	16/01/1996	
Data da última atualização: 	16/01/1996	
Autoria: 	SKEFFINGTON, R. A.; BROWN, K. A.	
Afiliação: 	Central Electricity Research Laboratories.	
Título: 	The effect of five years acid treatment on leaching, soil chemistry and weathering of a humo-ferric podzol.	
Ano de publicação: 	1986	
Fonte/Imprenta: 	Water, Air, and Soil Pollution, v.31, p.891-900, 1986.	
Idioma: 	Inglês	
Conteúdo: 	This paper describes the effect of treating a nutrient-poor forest soil in monolith lysimeters with H2SO4, pH 3.0, for 4.75 yr. The lysimeters were instrumented with porous cup probes to distinguish processes occurring in each soil horizon. In the A horizon base cation exchange and sulphate absorption were the principal proton- consuming processes whereas lower down the profile Al3+ dissolution from hydrous oxides dominated. Acid treatment thus reduced the amount of amorphous Al in the lower horizons, but exchangeable Al was unaffected. Sulphate absorption was positively correlated with the distribution of Al hydrous oxides. High rates of nitrification reduced the differences between acid and control monoliths, but acid treatment significantly reduced soilpH down to 75 cm and reduced the levels of exchangeable base cations in the litter and A horizons. Acid treatment increased the leaching rates of base cations and Al. Consideration of the total base cation content shows that acid treatment increased the rate of weathering by 0.7-1.4 k eq ha-1 yr-1. The results should be useful in modelling more realistic rates of acid input to similar soils.	
Palavras-Chave: 	Acid precipitation; Humo-ferric podzol; Intemperismo; Podzolico humico ferrico; Precipitacao acidas.	
Thesagro: 	Lisímetro; Lixiviação.	
Thesaurus Nal: 	leaching; lysimeters; weathering.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (4686-1) - ADC - SP - -- -  -  - 1993.04785 - DIS