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采用Hegyi提出的单木竞争指数模型对甘肃连城国家级自然保护区的青海云杉种内、种间的竞争指数进行定量分析。结果表明:青海云杉种内竞争指数随着林木径级的增大而逐渐减小,种内竞争远远大于种间竞争,种内种间竞争指数的大小顺序为青海云杉>青杄>桦叶四蕊槭>山杨>红桦>柳树;竞争指数与对象木的胸径之间服从幂函数关系CI=AD~B,当青海云杉胸径达到45cm以上时,竞争指数变化很小;青海云杉的竞争指数与海拔和郁闭度呈显著正相关性。
Based on the single-tree competition index model proposed by Hegyi, the competition index of species and interspecific competition of Picea crassifolia in Liancheng National Nature Reserve of Gansu Province was quantitatively analyzed. The results showed that the interna competition index of P. spruce decreased with the increase of tree diameter, and the intraspecific competition was much larger than that of interspecific competition. The order of the interspecific competition index was Qinghai spruce> The competition index and the DBH of object wood obey the power function CI = AD ~ B. When the DBH of Qinghai spruce reached above 45cm, the competition index changed little; the spruce The competition index was positively correlated with altitude and canopy density.