卵圆蝽空间分布型及其应用

对卵圆蝽越冬若虫的空间分布型研究表明:越冬若虫在不同虫口密度下均呈聚集分布,分布的基本成分是个体群;聚集原因除与环境因素有关外,亦与若虫的聚集行为有关,平均每株2～3头若虫是卵圆蝽若虫聚集机制发生变化的临界值;将样本资料用Iwao的代换公式进行代换,能取得比较满意的效果。此外,根据Iwao的方法,给出了卵圆蝽越冬若虫的序贯抽样表和在不同密度下的最适抽样数。

Spatial Distribution Pattern of Hippota dorsalis (Stal) and Its Application

All overwintering nymphs of Hippota dorsalis obeyed aggregation distribution at different population density. The basic part of distribution was individual colony. The cause of aggregation was related to not only the environmental factors but also the gathering behavior of the overwintering nymphs. Two to three nymphs of Hippota dorsalis in mean up a plant were critical value of changing the aggregation system. The sample data was transformed by Iwao's transformation formulae could get a better result. In addition, with Iwao's method, the sequential sampling table of the overwintering nymphs of Hippota dorsalis was obtained and the optimum sample size was calculated.