Estimation of Growth Parameters using the Local Yield Table Construction System for Planted Forests throughout Japan

抄録

We applied the Local Yield Table Construction System (LYCS), a computer program that predicts stand growth using various stand density controls, to sugi (Cryptomeria japonica), hinoki (Chamaecyparis obtusa), and karamatsu (Larix leptolepis) plantated forests throughout Japan. The parameters were estimated from yield tables of karamatsu forests produced by the managers of the national forests in the Hokkaido, Iwate, Dewa, and Shinshu regions of Japan. The diameter at breast height (DBH) and the number of trees measured in permanent plots were used as the parameters for estimating the effect of stand density on diameter growth. We used these parameters to estimate stand growth in terms of tree height, DBH, and tree diameter distribution. The estimated stand growth data calculated using these parameters were comparable to data in the original yield tables and observed values obtained from permanent plots. These results enabled us to construct yield tables for various stand density control plans for karamatsu forests.