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中文摘要：
应用Hegyi的单木竞争指数计算了雾灵山自然保护区天然油松（Pinus tabulaeformis）、白桦（Betula platyphylla）及山杨（Populus dauidiana）群落的竞争强度．发现山杨群落的竞争强度最大，白桦林次之，油松林最小，三者的种内竞争均高于种间竞争．计算距对象木2．5，5．0，7．5及10．0m范围内的竞争强度值，发现油松和山杨的竞争强度最大值出现在2．5～5．0m处；白桦的竞争强度最大值出现在5．0～7．5m处，这可能受到树种冠幅大小的影响.
英文摘要：
The Hegyi＇s signal tress competition index is used to calculate competition intensity of Pinus tabulaeformis, Betula platyphylla and Populus davidiana natural forest in the Wuling Mountain Nature Reserve. The results show that P. davidiana is the largest in the competition intensity, B. platyphylla is in the second place, and P. tabulaeformis is the smallest. The interspecies competition is larger than intraspecies competition in all the three species. The values of competition index are calculated at the distance of 2. 5, 5.0, 7. 5 and 10.0 m from the objective tree. It is found that the competition intensity is high at 2. 5-5.0 m for P. tabulaeformis and P. davidiana, and at 5.0-7. 5 m for B. platyphylla, which might be influenced by canopy size of trees.
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