The study was based on 6 permanent plots data of polar-birch secondary forests in Changbai Mountain, which owned the same site quality, mixed proportion and diversity of trees. The plots were located and the tree diameters at breast heights were investigated. By applying hierarchical cluster method, the plots were classified according to diversity of trees and species evenness. Then the relationship between stand volume increment and spatial isolation of trees was analyzed by tree species diversity mingling method. With the same of site quality, diversity of trees, diversity of tree and mixed proportion, the results manifested that the stand volume increment in the plots declined with the incensement of spatial isolation of trees. Finally, the reasonable advices of trees spatial isolation were given, which helps to manage an optimal spatial structure.%以6块立地条件、林分密度和混交比相同的长白山天然杨桦次生林固定样地为研究对象,样地内每木检尺和定位.通过系统聚类方法划分出树种多样性和物种均匀度相同的样地,利用树种多样性混交度研究林分蓄积生长量与物种空间隔离度的关系.结果表明:在立地条件、株数密度、混交比和树种多样性相同时,样地内林分蓄积生长量与树种空间隔离度呈反比关系.最后给出树种配置方法的建议,为今后经营合理的天然次生林空间结构给予启示.
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