インドネシア東ジャワのアグロフォレストリーにおけるチーク人工林 : (Tectona grandis)の地上部バイオマスおよび葉面積量推定のための相対成長式

摘要

Allometric equations were described for estimating stem, branch and leaf biomass from measurements of stem diameter at breast height (D), stem diameter at the lowest major living branch (D_B) and total height (H) in the teak tree (Tectona grandis) under both traditional and intensive taungya and alley cropping system of agroforestry management in moist deciduous forests of East Java, Indonesia. The results showed a diameter of 1.3m above the ground (D) alone was a good predictor of stem diameter at the lowest major living branch (D_B) and tree height (H). Leaf area (U) was a good predictor of leaf dry weight (W_L). When D was combined with H, r^2 was improved somewhat for stem and branch biomass. The relationships among measured tree dimensions drew a simple linear in log-log scale diagrams with r^2 over 0.969, suggesting the growth patterns of tree dimensions were closely interdependent, whereas the allometric equation between D and H was approximated by the hyperbolic relation with r^2 over 0.853. The individual tree equations appear to be applicable over a wide area of agroforestry management practices, and are usable for both young and old planted teak forests in East Java.