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Titolo:
Element fluxes and buffer reactions in acidified soils from a humid-temperate region of southern europe
Autore:
Merino, A; Macias, F; Garcia-Rodeja, E;
Indirizzi:
Univ Santiago de Compostela, Escuela Politecn Super, Dept Agr Chem & Soil Sci, E-27002 Lugo, Spain Univ Santiago de Compostela Lugo Spain E-27002 Sci, E-27002 Lugo, Spain
Titolo Testata:
WATER AIR AND SOIL POLLUTION
fascicolo: 3-4, volume: 120, anno: 2000,
pagine: 217 - 228
SICI:
0049-6979(200006)120:3-4<217:EFABRI>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
GALICIA NW SPAIN; ACID FOREST SOILS; DEPOSITION; ALUMINUM; ACIDIFICATION; HORIZONS; SULFATE;
Keywords:
acid-buffering reactions; acid deposition; aluminium; element budget; soil acidification;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Merino, A Univ Santiago de Compostela, Escuela Politecn Super, Dept Agr Chem & Soil Sci, E-27002 Lugo, Spain Univ Santiago de Compostela Lugo SpainE-27002 002 Lugo, Spain
Citazione:
A. Merino et al., "Element fluxes and buffer reactions in acidified soils from a humid-temperate region of southern europe", WATER A S P, 120(3-4), 2000, pp. 217-228

Abstract

The present study aimed to assess the buffering reactions and identify thesources of ion replenishment by carrying out a laboratory leaching experiment using some soils from a humid, temperate region of Northern Spain. The experiment consisted of the addition of a solution of H2SO4 to five soils developed on various types of parent materials (granulite, serpentinite, schist, granite and sandy sediments) and differing markedly in their mineralogy and chemical properties. Although the treatment considerably intensified the leaching of base cations, the exchangeable fraction increased or was not affected, which indicated significant mobilization of these elements fromnon exchangeable fractions. The soils differed markedly in the amounts of SO42- retained, however only a small part of the amount retained in the upper horizons was adsorbed. Acid load was mainly produced by free deposited H and nitrification of internal organic N. Sulphate retention was the dominant buffering mechanism in the soils developed on serpentinite and schist. Proton consumption linked to Al mobilization occurred in the surface horizons of all soils, but especially in the most acidic soils, those on granite and schist. In the soil on sandy sediments, the dissolution of CaCO3 constituted the only buffering mechanism.

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Documento generato il 25/09/20 alle ore 00:31:55