采用扩散系数C、Lloyd的指标L、Iwao回归及Taylor幂的法则测定:针叶小爪螨越冬卵孵化盛期活动螨在叶片上存在着个体群,个体群的空间分布为聚集分布,且具聚集度的密度依赖性。在此基础上,给出了理论抽样数和序贯抽样方案。并对活动螨的聚集原因作了探讨。 Diffusion coefficient C, Lloyd index L, Iwao regression and Taylor power law were used to determine the spatial distribution of individual mites in the leaves during the incubation period of overwintering eggs. Density dependence of degree of aggregation. On this basis, the theoretical sampling number and sequential sampling plan are given. The reasons for the aggregation of active mites were also discussed.