本数密度の異なるスギ・ヒノキ林における航空機LiDARによる単木の立木幹材積推定

摘要

林業経営において，施業計画，経営計画立案には，rn森林の詳細な情報を得る必要があり，特に伐期を迎えrnる林分について，単木単位での立木幹相模や位置情報rn等，詳細な情報を得ることが出来れば，伐採・搬出にrnかかるコストと収益を算出することが可能となり，よrnり確実な計画の立案が可能である。%The purpose of this research is to estimate the individual stem volumes with small-footprint LiDAR (Light Detection And Ranging) data. The study area was a plantation of Sugi (Cryptomeria japonica D. Don) and Hinoki (Chamaecyparis obtusa Endl.) with plots of differing densities. We established the regression model to estimate individual stem volumes. Especially, we analyzed the effect of stand density to estimate stem volumes. As a result, the effect by stand density was not admitted both of Sugi and Hinoki. Therefore, we established the regression model to estimate individual stem volumes that does not depend on stand density. Then, we were able to estimate individual stem volumes for Sugi and Hinoki. The cause of the error for stem volumes was presumption accuracy of the tree crown surface area.