中国山地の落葉広葉樹二次林における物質循環の斜面位置による相違

概要

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Differences of nutrient accumulation and flows in a warm-temperate deciduous broad-leaved secondary forest situated on a slope are summarized. The composition of tree species changed from mesic to xeric on ascending the slope, with Japanese red pine (Pinus densiflora S. et Z.) dominant at the ridge. The amount of nutrient elements accumulated in above-ground biomass was greater at the upper part of the slope, reflecting the presence of Japanese red pine. The nutrient accumulation in mineral soil was larger at the lower slope, whereas that in the A_0 layer was larger at the upper slope. Therefore, at the lower slope, the nutrient accumulation in forest soil becomes concentrated to mineral soil, but to the A_0 layer at the upper part of the slope. The amounts of potentially available nutrient returned through litter-fall and supplied through rainfall to the forest floor were larger at the lower than the upper part of the slope, as were turnover rate of nutrient elements within the forest. This trend corresponded with the mean loss rate due to docom-position in the A_0 layer. The nutrient returned to the forest floor was more rapidly decomposed at the lower slope than at the upper slope.
日本生態学会の論文
1988-08-31