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Significance of the total cation concentration in acid forest soils for the solution composition and the saturation of exchange sites

Titelangaben

Matschonat, Gunda ; Vogt, Robert:
Significance of the total cation concentration in acid forest soils for the solution composition and the saturation of exchange sites.
In: Geoderma. Bd. 84 (1998) Heft 4 . - S. 289-307.
ISSN 1872-6259
DOI: https://doi.org/10.1016/S0016-7061(98)00009-3

Abstract

To assess the ecological quality of acid forest soils, the base saturation and the solution pH, Alconcentration and base cationrAl ratios are of interest. Relationships between these parameterswould facilitate this assessment. Examples are empirical relationships between pH and basesaturation, and between the Al concentration and the ionic strength of the soil solution. From amechanistic point of view, the theory of cation exchange implies that the total cation concentrationSCCssum of cationic charge in solution.is a key factor in soil–solution interactions. Our aimwas to demonstrate that relationships with the SCC to be expected from the theory can beobserved in the field. Such relationships have special relevance in view of a decrease in aciddeposition in Europe, which will lower the SCC. We studied the effects of the SCC on the soilsolution composition and the saturation of exchange sites in simulated batch experiments based onthe Gaines and Thomas equation. The results were compared to field data from a range of soilsunder the influence of highEurope.and negligibleNew Zealand.atmospheric deposition.Equilibrium calculations predict an increase in the fraction of trivalent cations in solution withSCC, while the fraction of monovalent cations decreases. This pattern with SCC was observed inpart of the lysimeters on a site with high deposition rates. The variation in SCC among soilsolutions from New Zealand also produced the pattern, whereas this was not the case for a broadrange of European soils. We hypothesize that this difference be due to the impact of aciddeposition on the European soils. The most pronounced expression of the pattern was observed forlysimeter solutions from a European experimental siteSolling.under ‘clean rain’ treatment,where a large variation in SCC occurred. To estimate the development of base saturation in theEuropean soils under conditions of decreasing deposition, we calculated exchange equilibria forEuropean soils on the basis of soil solutions from New Zealand. The results indicated that anincrease in base saturation is not to be expected, as a low total cation concentration tends to lower the base saturation. We concluded that the SCC carries important information on the compositionof the soil solution and probably also on the saturation of exchange sites. The patterns created bycation exchange can be observed in natural soil solutions on different spatial scales. q1998Elsevier Science B.V. All rights reserved.Keywords: acid deposition; aluminium; cation exchange; forest soils; ionic strength; soil solution

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER7051
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 22 Okt 2015 07:29
Letzte Änderung: 22 Okt 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/20704