关键词: 冠径(cd), 胸径(D), cd/D关系, 阔叶树, 间伐强度, 树木空间

Abstract: In accordance with natural secondary forest Maoershan 30 standard wood seized each foot measured data, set up Maoershan Heaven 10 kind the relationship between crown diameter and diameter at breast height and the relatianship diameter at breast height and(cd/D), this article also discusses the (cd/D) ratio in the space of trees, basal area and stand density and thinning regimes on the application. Study shows that: 10~30 cm in diameter at breast height between the correlation coefficient (R²) at 0.8 above, the relationship between crown diameter and diameter at breast height in a straight line approximation. Different species of trees of different sizes (cd/D) ratio analysis, can be seen as an increase in the ratio of diameter at breast height is gradually decreased, and the trend of decrease with the increase in height has stabilized, and finally tends to a constant.

Key words: crown diameter(cd), diameter at breast height(D), cd/D relationship, broadleaved, thinning regimes, tree spacing