西マレーシア, パソー多雨林における枯死材の集積と分解
1977 年 27 巻 1 号 p. 53-60
詳細
1977 年 27 巻 1 号 p. 53-60
The dynamics of big wood litter (diameter>10 cm)was studied at Pasoh Forest, a lowland rain forest reserve in West Malaysia. The mean accumulation and mean fall rate of big wood litter amounted to 49 t ha^<-1>and 9.3 t ha^<-1>y^<-1>. The rate of decomposition of wood litter was estimated from the rate of CO_2 evolution and the dry weight/CO_3 conversion factor (0.56) obtained by determining the carbon content of the dead wood. The CO_2 evolution rate was linearly correlated with the bulk density of the wood, showing that the loss of weight of wood litter followed a logistic curve. The estimated half-time of weight loss in wood samples of two tree species was 1.4-2.5 years, being nearly ten times as long as that of fine litter. Based on the above formulations, the mean loss of organic matter due to the decomposition of big wood litter was calculated at 16.1 t ha^<-1>y^<-1>, though to a certain extent this might be overestimated.
