高解像度可搬型スキャニングライダーを用いたイチョウの葉傾斜角分布季節変化の計測

抄録

Ginkgo trees were scanned in May, September and November by a high resolution portable scanning lidar to estimate leaf inclination angle (LIA) distributions of different three seasons. From the obtained data, 150 leaves were selected in each season and a plane was fitted to each leaf by a least-squares method. LIA was estimated from the zenith angles of the fitted plane's normals. By aggregating these angles, the LIA distributions in each season were obtained. The resultant distributions were different each other and the seasonal change was observed. The difference seemed to reflect the growth conditions such as bud break, leaf expansion, defoliation. The results were compared with the ones of Japanese zelkova trees that grow in the same site and difference was observed between the distributions of ginkgo trees and Japanese zelkova ones. Several factors such as structural difference, species specific characteristics seemed to be causes of the difference.