青海土蝗空间分布型及序贯抽样技术的研究

THE STUDY ON SPACIAL DISTRIBUTION PATTERNS AND SEQUENTIAL SAMPLING TECHNIQUES FOR NATIVE GRASSHOPPER IN QINGHAI

本文运用聚集度指数（Ｃ、Ｉδ、ｍ＊和ｍ＊／ｍ）、Ｔｗａｏ的ｍ＊－ｍ回归分析方法，测定了青海土蝗的空间格局。结果表明，青海土蝗呈随机分布。分布的基本成分是个体群（α＞０），个体群的分布是随机的（β＝１）。根据空间分布信息，运用Ｉｗａｏ的序贯抽样技术。

A certain pattern of an insect, the Qinghai native grasshopper was determined by applying the indices of patchiness (C、I δ、m[DD(-*4]* and m*/m) and Iwao′s m*-m regression analysis method. The result showed here that this spacial pattern belongs to Poisson distribution theoretically, the basic composition of distributive pattern is an individual association with α>0, i.e., the Poisson distribution with β≈1. Sequential sampling table was thus given on the basis of Iwao′s model together with its spacial pattern parameters.