花椒虎天牛初龄幼虫集团初龄幼虫空间分布研究  

Studies of the Spatial Distribution of the First Instar Larva Cluster of Clytus validus

作　　者：熊光灿[1] 

机构地区：[1]四川省林科院

出　　处：《四川林业科技》1991年第4期23-28,共6页Journal of Sichuan Forestry Science and Technology

摘　　要：本文运用聚集度指标法对花椒虎天牛初龄幼虫集团、初龄幼虫的空间分布型进行了研究。结果,初龄幼虫集团是负二项式分布;初龄幼虫个体呈聚集分布;所需最大抽样株数为:n=1.03+(516.24)/(?);序贯抽样的上限、下限方程式为:T_0(N)=2n±6.493n^(1/2)。The method of aggregation degree indication was used for studies of the spatial distribution of the first instar larva cluster of Clytus validus. The results have shown that the first instar larva cluster displays a negative binomial distribution but the first instar individuals assume an aggregation distribution. The maximum sampling number needed is as follows: n = 1. 03 +516.24/x. And the upper and lower limit equations of sequential sampling are: To(N) - 2n±6. 493 2^(1/n).

关 键 词：初龄幼虫集团 花椒虎天牛 分布 

分 类 号：S763.749[农业科学—森林保护学]