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Titolo:
Phosphate and sulfate retention by nonvolcanic soils with andic properties
Autore:
Barreal, ME; Arbestain, MC; Macias, F; Fertitta, AE;
Indirizzi:
Univ Santiago de Compostela, Fac Biol, Dept Edaafol & Quim Agr, Santiago De Compostela 15782, Spain Univ Santiago de Compostela Santiago De Compostela Spain 15782 82, Spain UNLP, INIFTA, CONICET, CICPBA,Inst Invest Fisicoquim Teor & Aplicadas, RA-1900 La Plata, Argentina UNLP La Plata Argentina RA-1900 & Aplicadas, RA-1900 La Plata, Argentina
Titolo Testata:
SOIL SCIENCE
fascicolo: 10, volume: 166, anno: 2001,
pagine: 691 - 707
SICI:
0038-075X(200110)166:10<691:PASRBN>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
VARIABLE CHARGE SOILS; WEIGHT ORGANIC-ACIDS; IRON-OXIDES; ANION-ADSORPTION; ALLOPHANIC SOILS; FOREST SOILS; ALUMINUM; SORPTION; MATTER; RELEASE;
Keywords:
andic soil properties; phosphate sorption; sulfate sorption; anion release;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Arbestain, MC Univ Santiago de Compostela, Fac Biol, Dept Edaafol & Quim Agr, Santiago De Compostela 15782, Spain Univ Santiago de Compostela Santiago De Compostela Spain 15782
Citazione:
M.E. Barreal et al., "Phosphate and sulfate retention by nonvolcanic soils with andic properties", SOIL SCI, 166(10), 2001, pp. 691-707

Abstract

Soils with andic properties have a high anion retention capacity, which ismainly related to the large amounts of active Al and Fe compounds that they contain. The phosphate (PO4) and sulfate (SO4) sorption capacity of soilswith andic properties from Galicia, NW Spain, was investigated. Phosphate sorption experiments were conducted by adding 1.6, 16.1, and 48 mM KH2PO4 to soils, and those of sulfate by adding 0.4 and 1.6 mM K2SO4 (ratio of soil:solution, 1:10). The pH of the extracts was measured, as were the levels of PO4 (only in the PO4 experiments), SO4, Si, and dissolved organic carbon. The soils retained much higher amounts of PO4 than of SO4. Surface horizons displayed a higher capacity than subsurface horizons for retaining PO4 but not for retaining SO4. The PO4 retention capacity was related to the sum of contents of oxalate extractable-Al (Al-o) and -Fe (Fe-o), which tended to increase with soil organic carbon content and was mainly attributed to the presence of Al-humus complexes. Sorption of PO4 primarily produced displacement of dissolved organic carbon, Si, and SO4 into solution and increasesin solution pH, whereas sorption of SO4 only generated increases in solution pH. The low ability of SO4 anions to displace sorbed organic C mainly explains why surface horizons retained similar or even smaller amounts of SO4than subsurface horizons, despite the higher Al-o and Fe-o contents of theformer. The results emphasize the different affinities of PO4 and SO4 for reactive surfaces and the interaction of organic C in sorption processes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 04:37:28