森林土壤における有機炭素の動態と垂直分布に関する数学的モデル : II.根の枯死現象を考慮したモデル

抄録

NAKANE, Kaneyuki (Dept. Biol., Fac. Sci., Osaka City Univ., Osaka). 1978. A mathematical model of the behavior and vertical distribution of organic carbon in forest soils. II. A revised model taking the supply of root litter into consideration. Jap. J. Ecol., 28 : 169-177.The model proposed in the preceding paper (NAKANE & SHINOZAKI, 1978) was further improved by adding root litter as another source of soil organic matter. The new model simulated the vertical distribution of soil organic carbon concentration in terms of the rates of humus supply from the A_0-layer and the dead roots and of the downward transfer of humus along a soil profile. It fitted satisfactorily the data obtained in a few climax forests of Japan. The results of the fitting showed that the annual mortality of fine roots was between 10% and 20% of their biomass, and that the rate of root litter supply was equivalent to about 20% of that of the aboveground littetfall in warm-temperate and cool-temperate broadleaf forests of central Japan. It was also shown that the preceding model could be derived from the new model as a special case.