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| Koch, AS; Matzner, E: Heterogeneity of soil and soil solution chemistry under Norway spruce (Picea abies Karst.) and European beech (Fagus silvatica L.) as influenced by distance from the stem, Plant and Soil, 151, 227-237 (1993) | |
Abstract:
The influence of the distance to the stem on the chemical properties of soil and soil solution were
investigated in a mature European beech (Fagus silvatica L.) and a Norway spruce (Picea abies Karst.)
stand by comparing areas close to stems with reference areas between stems. Under beech, significant
changes of soil chemistry close to the stem were observed. Distance from the stem influenced the
exchangeable K, Mg, Ca and AI, as well as soil pH. Ca/A1- and Mg/Al-ratios of the soil solution
showed higher values at the base of the stem. A significant increase of K and NO3-N concentrations of
the soil solution close to the stem was found. No significant differences of soil analyses from reference
sites and the base of the stem were detectable in case of spruce. Only the soil solution chemistry of the
spruce site showed distinct spatial patterns. A significant increase of Ca, K and NH 4 concentrations was
determined next to the stem, while the concentrations of NO 3 were considerably decreased. These
findings suggest that the spatial heterogeneity of soil and soil solution chemistry related to stem distance
should be taken into account when establishing element budgets and when evaluating the nutrient
resources and the risk of acid toxicity to tree roots. |
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