白杨透翅蛾幼虫空间分布型及其应用

通过几项聚集度指标测定了白杨透翅蛾幼虫的空间分布型,所有指标都表明其分布为聚集分布。聚集的原因是由于成虫的产卵习性和幼虫的为害习性形成的。本文应用了lwao的统计方法,提出了资料代换公式和最适抽样数公式。

Study on the Spatial Distribution Patterns of Larvae of Dusky Clearwing Moth and its Application

Spatial distribution patterns for larvae of the dusky clearwing moth were measured by means of several indexes of aggregation in JiLin province. All indexes indicate that the larvae is of aggregation pattern. the reason of aggregation is also discussed in the paper. Iwao's method of regression of mean crowding (X*) on mean density (X) is a good method for detecting the aggregation patterns. Based on this method and the patterns, the optimal sampling has been proposed and Iwao's equation for data transfomation was applied.