【摘要】 通过对地处秦岭的28年生油松飞播林进行标准地调查,从林木个体在地面上的分布格局、树种隔离程度、大小分化度等3个方面分析林分空间结构。结果表明:高密度林分林木属团状分布,中密度林分为随机分布,低密度林分为均匀分布;各类林分的混交程度都很微弱,几乎为油松纯林;高密度林分的林木大小差异不大,低密度林分差异很大,中密度林分介于二者之间。据此,对油松高密度林分应采取抚育间伐措施,使其结构合理,功能和稳定性增强。更多还原

【Abstract】 Investigation was carried out by using sampling plots in the 28-year-old aerial sowing forest of Pinus tabulaeformis located in Qinling Mountains.The spatial structure was analyzed from the aspects of tree distribution pattern,degrees of species isolation,and degree of size differentiation.Stands with high, medium,and low density exhibited group,random,and normal distribution pattern,respectively.The mixed degrees of different stands were low,the stands almost dominated only by pure P.tabulaeformis.Size differences in high density stand were not significant,significant in low density stand,and in medium density stand,the differences were between high and low density stands.It was concluded that thinning should be conducted in the stands with high density to form a reasonable structure,and to increase its function and stability.更多还原