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利用Hegyi单木竞争指数模型对庞泉沟自然保护区优势种群的种内、种间竞争关系进行了定量分析。结果表明:种内和种间竞争强度随着林木径级的增大而逐渐减小,种内竞争较之与其伴生树种间的竞争剧烈。华北落叶松种内、种间竞争强度大小顺序为:种内>云杉>红桦>白桦>关帝柳>花楸>山杨。竞争强度与对象木胸径之间存在显著的幂函数非线性回归关系,回归结果与林分实际相符,从而为庞泉沟自然保护区混交林理论研究和合理经营提供了科学依据。
The Hegyi single-wood competition index model was used to quantitatively analyze the intraspecific and interspecific competition among the dominant populations in Pangquangou Nature Reserve. The results showed that the intraspecific and interspecific competition intensities decreased with the increase of tree diameter, and the competition among intraspecies was more intense than that between their interspecific hybrids. The order of intensities of interspecific competition in Larix principis-rupprechtii was as follows: within species> spruce> red birch> white birch> guantianliu> Sorbus alba> aspen. There was a significant power function nonlinear regression relationship between the competition intensity and woody DBH, and the regression results were in good agreement with the forest stand, which provided a scientific basis for the theoretical research and rational management of the mixed forest in Pangquangou Nature Reserve.