种群空间格局的研究是昆虫生态学的重要内容 ,它不仅揭示出种群的空间结构特征 ,而且还是确定抽样技术和资料代换的基础 .二斑叶螨是苹果园的重要害螨 ,应用 4种聚集度指标和Iwao法分别考查了该螨在苹果树内的空间格局及动态规律 .结果表明 ,二斑叶螨在树内不同方向和高度上均以个体群的形式存在 ,个体群的分布为聚集分布 .其中上层和南面树冠的聚集度最高 ,而下层和内部树冠的聚集度最低 .造成这种差异与该螨的生物学特性和环境条件的异质性有关 .不论螨体在上层、中层或下层树冠 ,都明显地表现出前期高聚块 ,6月中旬以后聚集强度逐渐降低的趋势 The study of population spatial pattern is an important part of insect ecology, which not only reveals the spatial structure of the population, but also determines the basis of sampling technology and data substitution. Two-spotted spider mite is an important pest mite in apple orchard, The degree of aggregation index and the Iwao method were used to examine the spatial pattern and dynamics of the mite in the apple tree.The results showed that the two-spotted spider mites existed as individual groups in different directions and altitudes in the tree, Which showed the highest degree of aggregation of canopy in the upper layer and the south and the lowest degree of crown in the lower layer and the inner canopy.This difference was related to the heterogeneity of the biological characteristics and environmental conditions of the mite.Whether the mite in the upper layer, middle layer Or the lower canopy, all clearly showed high pre-agglomeration, with the trend of decreasing in intensity gradually after mid-June