格氏栲天然林主要种群直径分布结构特征

应用 5种概率分布律对格氏栲林 8个主要树木种群的直径结构进行拟合 ,比较不同类型的拟合效果 ,探索各种群直径分布结构特征 .结果表明 ,β分布函数较好表达格氏栲林主要树木种群的直径分布结构 ,拟合效果最好 ,正态分布函数次之 ;不同群落类型的格氏栲种群直径分布均符合β分布 ,偏度大部分呈正偏 ,峰度均为负 ,表明优势种格氏栲种群直径分布范围较大、中径材占多数 .同时格氏栲种群直径 β分布参数与林分平均胸径等特征因子存在显著关系 .其研究对格氏栲林的合理经营及森林调查 ,均具有重要意义

Structure Feature of Diameter Distribution on Main Tree Populationsin Natural Forests of Castanopsis kawakamii

Five probability models are applied to analysis the structure features on diameter distribution of 8 main tree populations in natural forests of C kawakamii.The results show that Beta distribution models is the best fitness to express the structure of diameter distribution of main tree populations in natural forests of C kawakamii,and that Normal distribution is second.Diameter distributions of C kawakamii population in different main communities all obey Beta distribution model,a big parts of skews are positive and crests are all negative,which suggest that the range of diameter distributions are wider and the number of mid size wood is in the majority.The relationship of parameters of diameter Beta distribution in C kawakamii population with average D B H in natural forests is remarkable.The resulting principle will provide an important guide for natural forest management and survey