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本文应用关帝山庞泉沟自然保护区标准地复查资料，研究了华北落叶松林邻体间相互干扰的问题。在前人工作的基础上，提出了用冠幅代替胸径表示邻体竞争关系的干扰指数改进模型，此模型不但保证了其数学上逻辑的一致性，同时增加了生态学的解释意义，提高了模型的精确度。
In this paper, the standard data of Pangquangou Nature Reserve in Guandi Mountains are used to review the data to study the mutual interference between adjacent communities of Larix principis-rupprechtii. On the basis of previous work, this paper proposes an improved model of interference index which substitutes crown diameter instead of DBH to represent the competing relationship of neighboring cells. This model not only guarantees the consistency of mathematical logic but also increases the meaning of ecological interpretation and improves The accuracy of the model.