簡易空中写真によるスギ人工林の林分構成要素の測定(I) : 平地林分の場合

概要

論文の詳細を見る
Simple aerial photographic equipment suggested by NAKAKITA, which suspends a stereo camera device from a captive balloon, was used to measure the detail of both a pre-closed stand and a closed stand of sugi, Japanese cedar (Cryptomeria japonica D.DON) plantation on level ground. A pair of vertical super-large-scale photographs was taken of each stand, and the trees on the enlarged photographs were measured for number, position, and crown diameter on plots in the stands. Estimation of the number of trees was perfect. Determination of tree position also was almost as accurate as that obtained by a ground survey of the pre-closed stand. The significance of the measurement of crown diameters was made certain by the fact that the correlation coefficient between crown areas calculated from crown diameters and stem basal area was adequate in the stands. From this experiment, it was concluded that simple aerial photo measurement of stand detail is an effective method for some elements of a stand. However, it must be pointed out that it is very difficult to position the balloon above a subject stand in a forest area because of the wind.
一般社団法人日本森林学会の論文
1982-11-25