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).
出处
《四川林业科技》
北大核心
1991年第4期23-28,共6页
Journal of Sichuan Forestry Science and Technology
关键词
初龄幼虫集团
花椒虎天牛
分布
first instar larva cluster
spatial distribution
aggregation degree indication
