黄刺蛾空间分布型研究及应用

A STUDY ON THE SPATIAL DISTRIBUTION PATTERN OF Cnidocampa flavescena(Walker)AND ITS APPLICATTON

应用５种聚集度指标和Ｉｗａｏ的聚集度回归法，测定了江西农业大学板栗林内黄刺蛾虫茧的空间分布型，并用方差分析方法对黄刺蛾虫茧在板栗树上的分布进行分析。结果表明，黄刺娥虫茧种群分布为负二项分布，板栗树中，上部虫茧数目显著多于下部，阴面多于阳面。在此基础上确立了黄刺蛾种群虫口密度与有虫株率的Ｐ工关系式及最适抽样公式。

The spatial distribution pattern of the xoxoons of Cnidocampa flavescens (Walker)in theChestnut garden in Jiangxi Agricultural University was measured byusing the five indices ofaggregation and Iwao’s method of regression analysis;and the spatial distribution of the co-coons in chestn ut trees was analysed by using the method of difference analysis.The resuItsshowed that the spatial distribution pattern of the cocoons of Cnldorampa flavescens was a neg-ative binomial distribution, and that the amounts of the cocoons in the middle and upper partsof the chestnut trees were obviously greater than in lower part of the trees and obviouslygreater in the shade part of the trees than in the exposed part of the trees. Based on above,both the. correlation equation between population density and thepercentage of the trees with the insect and the optimum sampling equation were established.