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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。
The Hegyi single-wood competition index model was used to quantitatively analyze the competition intensity of spruce and inter-species in the three communities dominated by Picea crassifolia. The results showed that competition among spruce species in P. armeniacum was more vigorous than that in P. arundinacea species. Competition intensity (CI) of target wood (Picea crassifolia) and individual size (D) AD-B, that is, the intensity of competition decreases with the increase of individuals. The model is used to predict the intensity of competition among species and species in Picea crassifolia.