...文 6桦树天然林的直径结构规律 林分直径结构（stand diameter structure），亦称为林分直径分布（stand diameter distribution），是指林分内各种大小直径树木的分配状态。直径是反 映林木大小最重要的特征因子之一，并且量测简便、精度高。
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The stand diameter distribution of juvenile stand appears an inversed "J"form, and that of the half mature forest approximately a normal distribution.
林分直径分布，幼龄林呈倒“J”型，壮龄林近似于正态分布；
The diameter distributions were simulated by the modified exponential distribution function for describing the stand structure, based on inventory data of broad-leaf forest in Changbai Mountain.
以长白山阔叶林三类清查资料为依据，采用修正指数分布式拟合并预测林分的直径分布。
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