东北林区4种主要森林类型直径结构的比较研究

Comparison of Diameter Structure of Four Forest Types in Jilin Province

分析了东北林区4种森林类型即阔叶混交林、针阔混交林、柞树林和长白落叶松人工林的直径结构特征,运用正态分布、Weibull分布、Gamma分布以及对数正态分布4种分布函数对4种森林类型的林分的直径分布进行了拟合,同时用卡方统计量对4种分布进行了检验,拟合结果和检验结果一致表明:在4个拟合分布函数中,阔叶混交林和柞树林用Gamma分布拟合直径分布效果更好,针阔混交林和长白落叶松人工林用Weibull分布拟合直径分布效果更好。

Analysis was made on diameter structure of four forest types, including mixed coniferous and broad-leaved forest, mixed broad-leaved forest, Quercus mongolica plantation and Larix olgensis plantation, in Wangqing county of Jilin province. Diameter distribution of the above-mentioned forest types is fitted by four distribution functions of normal distribution, Weibull distribution, Gamma distribution and lognormal distribution, and meantime, Chi square statistics is used for test. The result showed that Gamma distribution function had better fitting effect for diameter distribution of mixed broad-leaved forest and Q. mongolica plantation, and Weibull distribution one for mixed coniferous and broad-leaved forest and L. olgensis plantation.