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常绿阔叶林是我国亚热带东部地区的地带性自然植被。本次在浙江西北部研究的４４块常绿阔叶林样地的主要树种是青冈（Ｃｙｃｌｏｂａｌａｎｏｐｓｉｓｇｌａｕｃａ）、石栎（Ｌｉｔｈｏｃａｒｐｕｓｇｌａ－ｂｅｒ）、甜槠（Ｃａｓｔａｎｏｐｓｉｓｅｙｒｅｉ）、木荷（Ｓｃｈｉｍａｓｕｐｅｒｂａ）和苦槠（Ｃａｓｔａｎｏｐｓｉｓｓｃｌｅｒｏｐｈｙｌｌａ）等，Ｗｅｉｂｕｌｌ函数能够较灵活地用来表达常绿阔叶异龄林的这种具有不同偏度和峭度变化的直径分布。随着林分平均胸径（Ｄ）的增大，常绿阔叶异龄林的胸径分布表现出由指数形转向倒Ｊ形至正态形。偏度由正偏趋于负偏。峭度逐渐变小。多数相应增大的动态分布规律。采用参数预估法研究建立了以Ｄ为自变量的天然常绿阔叶异龄林直径分布动态模型及其预测数表。可供合理经营等参考使用。
Evergreen broad-leaved forest is a natural vegetation in the eastern subtropics of our country. The main species of 44 evergreen broad-leaved forest plots studied in the northwestern Zhejiang Province are Cyclobalanopsis gracile, Lithocarpus griseus, Castanopsiseyrei, Schimasuperba and Castanopsissclerophylla ), Etc. Weibull function can be used flexibly to express this kind of diameter distribution with different skewness and kurtosis. With the increase of mean DBH (D), the DBH distribution of evergreen broadleaf anaerobic forests turned from exponential to inverted J to normal. Skewed by the positive and negative tend to bias. Kurtosis gradually smaller. Most of the corresponding increase in the dynamic distribution. The parameter estimation method was used to establish the dynamic model of diameter distribution of natural evergreen broad-leaved forest with D as independent variable and its prediction table. For the rational management of reference.