Measurement of 3-D Structure of Japanese Larch (Larix kaempferi Sarg.) by Laser Scanner
レーザスキャナを用いたカラマツ群落の三次元構造の測定

Tomomi TAKEDA, Hiroyuki OGUMA, Yasumichi YONE, Yasumi FUJINUMA
2005 Journal of Agricultural Meteorology  
In this study, in order to measure the three-dimensional structure of forest, a new technique using a laser scanner was developed in a five-year-old Japanese larch community with a tree height of about / m grown at the experimental field of the National Institute for Environmental Studies. The Japanese larch community was divided into cubic cells, and plant area density (PAD) was calculated for each cubic cell from the gap fraction, which is the probability that a laser beam passes through a
more » ... ic cell. Leaf area density (LAD) was estimated from the di#erence between PAD measured in November ,**and wood area density (WAD) measured in March ,**.. Average plant inclination angle (APIA) and average leaf inclination angle (ALIA) were also calculated. In order to verify a measuring method with a laser scanner, a comparison with the vertical distribution of LAD measured by the stratified clipping method was conducted. Although PAD measured with the laser scanner overestimated LAD measured by the stratified clipping method by a factor of two (r , ῒ*.32), the relation of + : + was found by LAD measured with the laser scanner and measured by the stratified clipping method (r , ῒ*.3.). The vertical distribution of LAD had a peak from + m to , m, and was well in agreement with the vertical distribution measured by the stratified clipping method. The three-dimensional distribution of LAD showed not only vertical distribution but also horizontal heterogeneity of canopy. ALIA calculated as an average of canopy was /1./ degrees. In conclusion, the method with the laser scanner was able to measure the three-dimensional structure of forest.
doi:10.2480/agrmet.61.39 fatcat:avg6ukl3cvcuxedehw4qn6h37u