Tree competition states were examined in two 50 m × 50 m plots of natural middle-aged forests of Mongolian oak, which are located at Jincang Forest Farm, Wangqing Forestry Bureau, Jilin Province. Eight competition indices were selected to show the states of inter-and intra-species competition. The analysis results indicated that the trees competed strongly in both aspects of intra-species and inter-species, especially for Mongolian oak. White birch and black birch, the strongest competitive species for Mongolian oak, were also the most competitive species in the forest. But the competitiveness of Mongolian oak was at the middle level among the species. The results of the indices differed from each other due to they reflected the competition from different aspects. The competition intensity of Mongolian oak decreased as the diameter of the individual tree increased, and the relationship can be reasonably depicted by power function.%以吉林省汪清林业局金仓林场2块面积为0.25 hm2的蒙古栎天然中龄林固定样地为对象,采用8个竞争指标,研究蒙古栎天然林种内、种间竞争状态.研究结果表明,该林分竞争激烈,蒙古栎与其他各树种存在种间竞争,但其主要竞争压力来自种内,种外竞争压力主要来自黑桦与白桦.其它树种的竞争主要为种间竞争.蒙古栎竞争能力处于中等,白桦与黑桦最强.各竞争指标结果存在差异性,但均能反映蒙古栎天然林竞争状态.蒙古栎竞争强度与胸径存在幂函数关系,竞争强度随个体大小的增大而减小.
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