【摘要】 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杄种内、种间的竞争指数进行定量分析。结果表明:青杄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;种内种间竞争强度的顺序为青杄>山杨>桦叶四蕊槭>油松>柳树>红桦。竞争指数与对象木的胸径服从幂函数关系CI.=AD–B,当青杄胸径达到40 cm以上时,竞争指数变化很小。青杄的竞争指数与海拔呈显著正相关性。更多还原

【Abstract】 Using Hegyi’s competition index model for individual tree,we analyzed the intraspecific and interspecific competition of Picea wilsonii in Liancheng National Nature Reserve of Gansu.The results showed that intraspecific competition intensity of Picea wilsonii reduced with the increase in diameter scale of the trees.The intraspecific competition was much larger than interspecific competition.The order of competition intensity(CI.) was listed as: Picea wilsonii > Populus davidiana > Acer tetramerum var.betulifolium> Pinus tabulaeformis> Salix sp.> Betula albo-sinensis.The relationship between competition intensity and individual growth of objective tree followed closely the following equation CI.= AD – B.When the diameter scale reached to 40 cm,there was little change of competition intensity.The CI.of Picea wilsonii was positively correlated with altitude.更多还原