核桃长足象幼虫空间分布格局及抽样技术研究

The Study on Spatial Distribution Pattern and Sampling Techniques of Alcidodes juglans Larvae

为了探明核桃长足象幼虫空间分布格局和抽样技术,采用5种聚集强度指标和Iwao、Taylor回归分析法,对核桃长足象幼虫空间分布格局及理论抽样模型和序贯抽样模型研究。结果表明:核桃长足象幼虫的空间分布型为聚集型分布,其产生和聚集是由昆虫自身的行为或当地的环境状况两种因素共同作用而导致的,且其幼虫个体间是相互排斥关系,聚集强度与密度有关。同时,建立了核桃长足象幼虫的理论抽样模型N=3.8416(-0.8275/m+0.5122)/D^(2),和其序贯抽样模型为d=nm_(0)±1.96√[n(-0.8275m_(0)+0.5122m_(0)^(2))],对于核桃长足象的林间预测预报及制定相应防治措施有很大意义。

In order to explore the spatial distribution pattern and sampling techniques of Alcidodes juglans larvae,their spatial distribution pattern,theoretical sampling model and sequential sampling model were studied by the means of regression analysis of Iwao and Taylor with five aggregation intensity indexes.The results showed that the spatial distribution type of Alcidodes juglans larvae was aggregation distribution,which was caused by the joint action of insect behavior or local environmental conditions,and the larvae were mutually exclusive,and the aggregation intensity was related to the density.At the same time,the theoretical sampling model N=3.8416(-0.8275/m+0.5122)/D^(2) and the sequential sampling model d=nm±1.96√[n(-0.8275m+0.5122m^(2))]were established,which was of great significance to the forest prediction of Alcidodes juglans larvae and the formulation of corresponding control schemes.