长白山核桃楸分布格局及其与伴生树种空间关联性的研究

目的]探讨核桃楸及主要伴生树种在不同生长阶段空间格局变化及其与伴生树种种间关联性的变化,为林业生产过程中的择伐和抚育提供理论依据.方法]运用Ripley＇K函数点格局分析方法,开展树种空间分布格局及种间关联性研究结果]在核桃楸幼龄林阶段,更新层的杨树幼苗、黄菠萝幼苗与核桃楸幼苗存在种间竞争,不利于核桃楸幼苗的生长;在核桃楸中龄林阶段可采伐林中的杨树以及与核桃楸生长较近的蒙古栎、椴树大树,与核桃秋中尺度距离的黄菠萝可以保留;在核桃秋近熟林中,应该择伐蒙古栎、杨树、黄菠萝大树,可适当保留林中椴树.结论]在核桃楸生长的不同阶段尽可能控制不利于核桃楸生长的阔叶树种,适时抚育,调整群落结构.

Study on the Spatial Pattern of Juglans mandshurica and Its Spatial Correlation with Accompanying Speeies in Changbai Mountain

Objective] To investigate the changes of spatial pattern of Juglans mandshurica and main accompanying speeies in different growth stages and the changes of spatial correlation between them,as providing theoretical guidance in the process of forest management.Method] This research uses the method of point pattern of the Ripley K function,studing on the spatial distribution pattern and spatial correlation of species.Result] At the age of juvenile Juglans mandshurica forest,there is interaction among poplar seedlings,amur corktree seedlings and Juglans mandshurica seedlings,it is bad for the growth of Juglans mandshurica in the regeneration layer.At middle-aged Juglans mandshurica forest,poplar and big tree of mongolia oak and linden that growing nearby Juglans mandshurica should be cut,the amur corktree that keep a certain distance from Juglans mandshurica may be retained.At near-mature Juglans mandshurica forest,big tree of mongolia oak,poplar and amur corktree should be cut,linden tree can be moderatelv retained.Conclusion] In different stages of Juglans mandshurica growth as far as cutting the broad-leaved trees which is no good for Juglans mandshurica growth,tending at the right time,adjusting community structure reasonably.