马铃薯瓢虫空间分布型及抽样技术的研究

Studies on the Spatial Distribution Patterns and Sampling Methods of the Phytophagous Ladybird Henosepilachna vigintioctomaculata

采用Iwao平均拥挤度回归式M=α+βm,Taylor幂法则S^2=am^b和频次分布检验等10种方法,验证了马铃薯瓢虫越冬代成虫,卵块和一代幼虫的空间分布型呈聚集型,多符合P—E格局,其聚集原因主要是由于环境作用所引起。三种虫态在田间分布的基本成分是疏松的双重个体群,大小个体群面积分别为1.10～1.32m^2和0.44～0.90m^2。经比较确定了棋盘式抽样法较有代表性,并根据n=t^2/D^2((α+1)/x+β - 1)提出了三种虫态不同密度下的抽样数模型。

Based on the field investigation the spatial distribution patterns of egg masses , Larvae and adults of Henosepilachna vigintioctomaculata were tested by the index C,Io,M* etc,Iwao’s M*-m regression and Taylor’s power law. All the patterns are aggregate and most of them can be illustrated by P-E distribution model . The main reason of aggregation is the difference of enviroments. There are double groups in the spatial distributions, the area of them is 1. 10～1. 32m2 and 0. 44～0. 90m2 seperately. It was proved that the chess-board pattern sampling is the most, suitable sampling method andthe theoretical sampling models were set up according to the equation n=t2/D2(α+1/x+β-1).