1990 年 40 巻 3 号 p. 179-186
A study was made of branch and leaf biomass in an 83-year-old man-made Cryptomeria japonica stand in the Tokyo University Forest in Chiba. In the study area, four plots with different topographical conditions were established, i.e., R-1 on steep ridge, R-2 on flat ridge, M on mid-slope, and B on bottom. Branch and leaf biomass were estimated by dimension analysis. Leaf biomass was estimated at 28 in R-1,26 in R-2,17 in M, and 13 t/ha in B. Plots with high tree density had tended to give large leaf biomass. Branch biomass was estimated at 40 in R-1,14 in R-2,25 in M, and 28 t/ha in B. Except in R-2,branch biomass exceeded leaf biomass by a factor of two or more, especially in B. In old stands, the very long life span of branches seems one reason for the apparently large branch biomass when compared with younger stands.