照葉樹林の枯死材の直径とその重量減少および炭酸ガス放出速度との関係 : 林床における枯死材の分解速度に関する研究 V
1985 年 35 巻 1 号 p. 57-66
詳細
1985 年 35 巻 1 号 p. 57-66
YONEDA, Tsuyoshi (Lab. Environ. Sci., Fac. Educ., Osaka Kyoiku Univ., Osaka). 1985. Relation of wood diameter to the rates of dry weight loss and CO_2 evolution of wood litter in evergreen oak forests (Studies on the rate of decay of wood litter on the forest floor, V). Jap. J. Ecol., 35 : 57-66. In his previous papers, the author discussed the leading role of bulk density of wood litter in determining the in situ decomposition rate on the forest floor. Field experiments in the evergreen oak forest of warm-temperate Japan showed that the wood diameter was also an important factor. The effect of mean bulk density (ρ^^-) on mean relative rate of dry weight decrease (r^^-) for different diameter (d) classes could be approximated by the equation, r^^-=-α'd^^-^<-0.2>ρ^^-+β. The same relation was found also for the rate of CO_2 evolution from wood litter. The coefficient β is the maximum relative rate of decomposition at d^^-→0,i.e. very fine wood or at ρ^^-→0,i.e. the final stage of decay, where the dry weight of litter is expected to decrease exponentially. The time course of weight decrease was also formulated to reveal the relation of wood diameter to the decomposition curve.
