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。
Using Hegyi’ s competition index model for individual tree,we analyse the intraspecific and interspecific competition of Picea crassifolia in Liancheng National Nature Reserve of Gansu.The results show that intraspecific competition intensity of Picea crassifolia reduced with increase in diameter scale of the trees.The intraspecific competition is more bigger than interspecific competition.The order of competition intensity(CI)is:Picea crassifolia>Picea wilsonii>Acer tetramerum var.betulifolium>Populus davidiana>Betula albo-sinensis>Salix sp.The relationship between competition intensity and individual growth of objecttive tree follows closely the equation CI=AD-B.When the diameter scale reaches 45 cm,there is little change of competition intensity.The CI of Picea crassifolia has plus correlation with altitude and crown density.
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