Surface area and CEC as related to qualitative and quantitative changes of forest soil organic matter after liming |
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| Authors: | A. Waldemar Wilczynski Manfred Renger G. Jozefaciuk M. Hajnos Z. Sokolowska |
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| Affiliation: | 1. Technical University Berlin, Inst. for Ecology, Dept. of Soil Science, Salzufer 11–12, W-1000 Berlin 10, FRG;2. Institute of Agrophysics Lublin, Dept. of physical Chemistry, Doswiadczalna 4, Lublin, Poland |
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| Abstract: | Water vapor adsorption isotherms were used for estimation of (apparent) surface areas of samples of limed and unlimed plots of an acidic sandy forest soil. Samples were taken at two microrelief (ridge and furrow) positions from five subsequent 10 cm layers. Values of surface area and CEC correlated linearly with organic matter content but only for four bottom layers. Surface areas and CEC values calculated per the unit mass of organic carbon were higher in upper layers than in lower layers for control samples. For limed samples an opposite trend was observed. The estimated average (apparent) charge densities of organic matter showed a better correlation with humic to fulvic acids ratio. Values of surface charge densities for every investigated profile increased with depth and they were lower in limed than in unlimed profiles. |
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