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Chang, Shih-Chieh ; Matzner, Egbert:
Soil nitrogen turnover in proximal and distal stem areas of European beech trees.
In: Plant and Soil.
Bd. 218
(2000)
Heft 1-2
.
- S. 117-125.
ISSN 1573-5036
DOI: https://doi.org/10.1023/A:1014931625707
Abstract
In European beech (Fagus sylvatica L.) forests, a large proportion of the water and ion input to the soil results fromstemflow which creates a soil microsite of high element fluxes proximal to the tree trunk. The soil proximal to thestem is considered to have different rates of nitrogen turnover which might influence the estimation of N-turnoverrates at the stand scale. In a previous study we reported high nitrate fluxes with seepage proximal to the stems in aforest dominated by European beech in Steigerwald, Germany. Here, we investigated the soil nitrogen turnover inthe top 15 cm soil in proximal (defined as 1 m2 around beech stems) and distal stem areas. Laboratory incubationsand in situ sequential coring incubations were used to determine the net rates of ammonification, nitrification,and root uptake of mineral nitrogen. In the laboratory incubations higher rates of net nitrogen mineralization andnitrification were found in the forest floor proximal to the stem as compared to distal stem areas. No stem relateddifferences were observed in case of mineral soil samples. In contrast, the in situ incubations revealed higher ratesof nitrification in the mineral soil in proximal stem areas, while net nitrogen mineralization was equal in proximaland distal areas. In the in situ incubations the average ratio of nitrification/ammonificationwas 0.85 in proximal and0.34 in distal stem areas. The net nitrogen mineralization was 4.4 g N m