摘要
刀切法是一种非参数估计方法。本文就油松毛虫卵(块)、越冬幼虫、5龄幼虫和蛹种群扩散型指数的刀切估计方法进行了研究,结果表明,与传统方法相比,刀切法能够给出种群扩散型指数的置信区间,弥补了某些指数在统计学上的本质不足,有利于准确、合理地应用扩散型指数测定生物种群的空间格局和聚集强度的比较。虚拟值的正态性间接证明了将刀切法应用于估计种群扩散型指数是适用的。刀切法应该成为生态学者手中一种有用的工具。但要注意,对于低密度种群,个别指数似乎不够灵验且有异常值(负值)出现。
The jackknifing method is one of the non-parametes estimating methods. The jackknifing method has been used to estimate the distribution indexes of population of Den-drolimus tabulacformis in the stage of egg,hiberating larve,pupa in this paper. The results show out the jackknifing method can been used to estimate the believable interval of the distribution indexes. That makes it possible to compare the two or more species population's spatial distribution pattern and their aggregation degree.
关键词
刀切法
扩散型指数
油松毛虫
越冬
种群
Jackknifing Method
Distribution Index Believable Interval
Dendrolimus Tabulaeformis
