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Titolo:
Sulfate sorption in nonvolcanic Andisols and Andic soils from Galicia, NW spain
Autore:
Arbestain, MC; Barreal, ME; Macias, F;
Indirizzi:
Univ Santiago de Compostela, Fac Bioloxia, Dept Edafoloxia & Quim Agr, Santiago De Compostela, Spain Univ Santiago de Compostela Santiago De Compostela Spain postela, Spain
Titolo Testata:
GEODERMA
fascicolo: 1-2, volume: 104, anno: 2001,
pagine: 75 - 93
SICI:
0016-7061(200111)104:1-2<75:SSINAA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC-MATTER; VARIABLE CHARGE; FOREST SOILS; ALUMINUM; ADSORPTION; ANDOSOLS; IRON; OXIDES; HUMUS;
Keywords:
sulfate sorption; Andisols; Andic soil properties; variable charge compounds;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Arbestain, MC Univ Santiago de Compostela, Fac Bioloxia, Dept Edafoloxia &Quim Agr, Santiago De Compostela, Spain Univ Santiago de Compostela Santiago De Compostela Spain
Citazione:
M.C. Arbestain et al., "Sulfate sorption in nonvolcanic Andisols and Andic soils from Galicia, NW spain", GEODERMA, 104(1-2), 2001, pp. 75-93

Abstract

Soils with andic soil properties generally retain large amounts of SO42-, a feature related to their elevated contents of short-range ordered minerals and/or insoluble Al-humus compounds. The objective of this study was to investigate the relationships between SO42- sorption and contents of Al and re compounds in soils from Galicia, NW Spain, with andic soil properties. Nineteen soils derived from gabbros, amphibolites, basic granulites, biotitic schists, and amphibolitic phyllites were sampled. Sulfate sorption was studied by adding a 0.4 mM SO42- solution (initially acidified to pH 3.0) to soils. Aluminum-humus complexes were abundant in surface horizons. Oxalate-and pyrophosphate-extractable Al (Al-o and Al-p, respectively) decreased with depth, whereas there was an increase in the NaOH-extractable Al (Al-n) minus Al-o fraction, associated with an increase in poorly crystalline forms of both gibbsite and 1:1 phyllosilicates. Iron was mostly present as crystalline oxyhydroxides. The abundance of variable charge materials and the acidity of these soils (pH H2O < 5.7) explain the high SO42- sorption detected. Sulfate sorption was positively correlated (at P < 0.01) with Al-n, Al-o, and Al-p in surface horizons, and with Al-n, Al-o, Fe extractable with dithionite-citrate (Fe-d) and oxalate (Fe-o) in subsurface horizons. The correlation between SO42- sorption and Al-o decreased sharply when data from all horizons were pooled. Blockage of reactive surfaces by organic compounds, in surface horizons and, the different Al compounds found in both types of horizons may explain the differences between them in the relationships between the Al/Fe fractions and SO42- sorption. The results emphasize the high SO42- retention capacity of both surface and subsurface horizons of nonvolcanic Andisols and Andic soils front Galicia. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 24/09/20 alle ore 05:04:21