青海云杉群落种内和种间竞争的初步研究

用Hegyi的单木竞争指数模型对以青海云杉为优势种的3种群落内青海云杉种内、种间的竞争强度进行定量分析。结果表明：青海云杉种内竞争较之与伴生树种间的竞争剧烈；竞争木对对象木（青海云杉）的竞争强度（CI）与对象木的个体大小（D）服从幂函数关系CI＝AD-B，即竞争强度随对象木个体的增大而减小；利用该模型预测了青海云杉种内、种间的竞争强度。

Preliminary study on the intraspecific and interspecific competitions of Picea crassifolia communities

With the aid of Hegyis'single tree competition index model, the intraspecific andinterspecific competition intensity in three type 0f Picea crassifolia communities arequantitatively analyzed at different developing stages. The results show that the intraspecificcompetition of PiCea crassghlia is more intensive than its interspecific competition with otherspecies of accompanying trees; the relation between competition intensity and individual growthof objective tree follows closely the power function equation as CI=AD-B, the model can simulateand predict the intraspecific and interspecific competition.