caa a22 4500 477112544 CHVBK 20180405111613.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00011432 doi (NATIONALLICENCE)springer-10.1007/BF00011432 Equilibrium solution composition and exchange properties of disturbed and undisturbed soil samples from an acid forest soil [Elektronische Daten] [G. Matschonat, R. Vogt] Microscalic heterogeneity of soil chemical properties caused by soil structure has been reported for several soils. We investigated exchange properties and soil solution composition of disturbed and undisturbed samples of an acid forest soil lacking visible structure. Cation concentrations in the soil solution resulting from two extraction procedures and two analytical methods were compared. The effective cation exchange capacity (CECe) of the undisturbed sample represented 56-69% of the bulk soil CECe. Base saturation of undisturbed samples equalled that of disturbed samples for EA, Bhs, and Bsh horizons, and was higher for the Bw horizon. Contradicting the results of other authors, soil pore solution obtained by percolating soil cores under conditions of low water tension offered more favourable conditions for plant roots when compared to the equilibrium soil solution of the bulk soil sample in all except the Bsh horizon. Ca2+/Al3+ molar ratios were higher and fractions of H+ + Al3+ on total cationic charge were lower in the soil pore solution. These results were obtained employing soil: solution ratios of about 1:0.5 during the extraction of soil pore solution, and by determination of free cations. Other authors used a water extraction with soil:solution ratios up to 1:2 and took total metal for ion concentrations. The combination of the latter extraction and analytical method in our study, too, led to unfavourable Ca2+/Al3+ ratios and high tractions of H+ + Al3+. The choice of analytical and extraction method are thus decisive for the valuation of the soil solution composition in view of plant nutrition. Kluwer Academic Publishers, 1996 cation exchange capacity nationallicence Ca/Al ratios nationallicence exchange coefficents nationallicence forest soils nationallicence soil solution nationallicence undisturbed samples nationallicence Matschonat G. Department of Soil Ecology, BITÖK, University of Bayreuth, D-95440, Bayreuth, Germany aut Vogt R. Department of Soil Ecology, BITÖK, University of Bayreuth, D-95440, Bayreuth, Germany aut Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 183/2(1996-09-01), 171-179 0032-079X 183:2<171 1996 183 11104 https://doi.org/10.1007/BF00011432 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011432 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Matschonat G. Department of Soil Ecology, BITÖK, University of Bayreuth, D-95440, Bayreuth, Germany aut NATIONALLICENCE 700 1- Vogt R. Department of Soil Ecology, BITÖK, University of Bayreuth, D-95440, Bayreuth, Germany aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 183/2(1996-09-01), 171-179 0032-079X 183:2<171 1996 183 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer