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Patterns of soil solution composition in acid forest soils : differences between undisturbed and bulk samples

Title data

Vogt, Robert ; Matschonat, Gunda:
Patterns of soil solution composition in acid forest soils : differences between undisturbed and bulk samples.
In: Zeitschrift für Pflanzenernährung und Bodenkunde. Vol. 160 (1997) Issue 5 . - pp. 549-554.
ISSN 0044-3263
DOI: https://doi.org/10.1002/jpln.19971600505

Abstract in another language

In acid forest soils pores draining under conditions of low water tensioncontain a solution usually differing in composition from the equilibriumsolution of the bulk soil. For tree nutrition, the former was describedas comparable to the bulk soil solution or less favourable. Ourrecent work on solution quality contradicted the universal validity ofthese findings. It turned out that the methods usually recommendedtend to consistently reproduce the pattern of more advanced acidificationof coarse pores. We applied our combination of methods to arange of soils to find out whether our previous finding of more favourablesolution conditions in undisturbed soil samples as compared tothe bulk soil is common or rather an exception. Undisturbed cores andbulk soil were sampled from four forested sites differing in pH andbase saturation. We used an iterative procedure to adjust the equilibriumsoil solution of disturbed soil and a water extraction with asoil:solution ratio of 1:2. To extract solution from undisturbed soilcores only small volumes of water were added, and we distinguishedanalytically between total (by ICP) and ionic (by CE) concentrationsof cations. We calculated Ca/AI molar ratios and the fraction of (AI’+ +H+) on total cationic charge in solution as criteria for solution quality.Whereas with total concentrations, there always appeared to be lessfavourable conditions in the soil pore solution, free ionic concentrationsallowed a differentiation between the soils. In view of plant nutrition,the quality of the soil solution from undisturbed samples wasbetter, equal to, or worse than that of the bulk soil, suggesting thatforest sites represent a continuum with respect to these chemical gradients.Even in soils where gradients are not observed it is not necessaryto assume an equilibrium achieved by internal processes to existbetween coarse pores and the bulk soil.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7024
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/20745