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

Title data

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. Vol. 84 (1998) Issue 4 . - pp. 289-307.
ISSN 1872-6259
DOI: https://doi.org/10.1016/S0016-7061(98)00009-3

Abstract in another language

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

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7051
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Oct 2015 07:29
Last Modified: 22 Oct 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/20704