森林生態系における人為的攪乱に伴う土壌炭素循環の動態シミュレーション : I.下生え刈り又は落葉掻きの場合

抄録

Change of the cycling of soil organic carbon was calculated mathematically on a daily basis by a simulation model in several types of matureforest disturbed by human activities such as cutting undergrowths or raking litters on the forest floor. The results of the calculations indicated that there was little effect of cutting undergrowths (excluding the herbaceous layer) on the cycling of soil organic carbon, while raking litters caused a significant decrease in the accumulation of not only A_0 layer but humus in the mineral soil. It was also suggested that the more frequent the raking of litters became or the lower the decomposition rate of A_0 layer became, the more sterility of the forest soil increased. However, after stop of the disturbances, especially raking of litters, the accumulation of soil organic matter calculated by the simulation model recovered its loss rapidly. These results of calculation also could be predicted by a simulation model constructed on an annual basis.