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在1986年7月—1987年7月分别在辽宁省喀左、朝阳、建平县,调查了落叶松毛虫(Dendrolimus superans Butler)、赤松毛虫(D.spectabilis But-ler)、油松毛虫(D.tabulaeformis Tsai et liu)分布。采用Iwao的m~*-m回归分析和Taylor幂的法则,测定三种松毛虫混合种群幼虫的空间分布型和其单一种群一样呈聚集分布,以个体群的形式存在于林间。聚集原因的分析结果表明,平均每株2.1238头幼虫是三种松毛虫混合种群幼虫聚集机制发生变化的临界值,也是生产中值得注意的一个生物学指标。文中利用了分布型中的有关参数,引入资料代换、序贯抽样技术和抽样数的确定。
Dendrolimus superans Butler, D.spectabilis But-ler, Dendrolimus tabulaeformis (D) were investigated in Kazuo, Chaoyang and Jianping counties of Liaoning Province from July 1986 to July 1987, respectively. Tabulaeformis Tsai et liu) Distribution. Using the Iwao m ~ * -m regression analysis and the Taylor power law, the spatial distribution patterns of larvae of three mixed species of Dendrolimus punctatus were aggregated and distributed in the form of individual groups in the forest. The analysis of the cause of aggregation showed that on average, 2.1238 larvae per plant were the critical values for the aggregation mechanism of larvae in the mixed population of three Dendrolimus species and also a notable biomarker in production. In this paper, the relevant parameters in the distributional model are used to introduce data substitution, sequential sampling technique and sampling number determination.