間伐이 편백나무의 直徑成長에 미치는 影響 = Effects of Thinning on Diameter Growth of Hinoki-Cypress

국문 초록 (Abstract)

間伐이 편백나무의 直徑成長에 미치는 影響을 究明하기 위해서 南海郡 二東面 所在 25㏊의 편백나무 林分中 北向林分(A)에서 間伐區(A_1)와 無間伐區(A_2)를, 또한 西向林分(B)에서 間伐區(B_1)와 無間伐區(B_2)를 각각 0.1㏊씩의 標準地를 選定하고, 이 標準地의 林木을 生長錐를 使用해서 胸高部位의 南北 두 方向에서 Core를 採取하였다. 이 Core의 各 年輪폭을 測定하여 直徑成長의 實態를 考察한 바 이를 要約하면 다음과 같다.
(1) 北向林分의 間伐區는 無間伐區에 比해서, 또한 西向林分의 間伐區는 無間伐區에 比해서 매우 넓은 年輪폭을 形成하였으며 한 年輪폭의 平均斷面積과 年輪폭의 累加面積은 2倍 以上의 成長을 하여 間伐의 效果를 뚜렷하게 나타내었다.
(2) 西向林分의 間伐區 및 無間伐구는 北向林分의 間伐구 및 無間伐區에 比해서 다소 좋은 성장을 나타내고 있으며 이는 立木度, 方位, 傾斜度, 土深, 標高 등 立地條件의 差異로서 이루어진 것이 아닌가 생각된다.

다국어 초록 (Multilingual Abstract)

This study was carried out to determine the effect of thinning on the diameter growth of hinoki-cypress (Chamaecyparis obtusa Endl.)
Each hinoki-cypress stand was seleced from the 25 ㏊. stand located at Leedong-Myeun Namhae-Goon. Each 0.1 ㏊. stand was designed by the thinning plot (A1) and the non thinning plot (A2) on the northern stand (A), and the thinning plot (B1) and non thinning plot (B2) on the western stand (B). This sample plot of the standing trees were taken the core of the breast hight (1.2m. above the ground) by using the increment borer on both the southern and northern directions.
The results obtained were as follows :
1. On both western stand and northern stand, the annual ring width in thinned trees was wider than that in the unthinned. Each average cross section area and the annual ring area summed in thinned trees were more than twice larger than those in the unthinned. There was a significant effect of the thinning on diameter growth.
2. Growth rate of both thinned plot and the unthinned plot of the western stand was better than that of both thinned plot and unthinned plot on the northern stand respectively. It was assumed that this tendency would be caused by the differences of soil site conditions such as density of trees, bearing, degree of slope, soil depth, and altitude etc.