桉蝙蛾幼虫空间分布型的研究

Preliminary Study on Spatial Distribution Pattern of Endoclyta signifer Walker Larva

[目的]研究桉蝙蛾幼虫的空间分布型。[方法]通过对广西北流市和陆川县等地的桉树人工林进行幼虫分布调查,共设10块标准地,采用6种不同的聚集度指标和回归模型分析法判断桉蝙蛾幼虫的空间分布格局。[结果]桉蝙蛾幼虫主要分布在1m以下树干基部;按蝙蛾幼虫的空间分布型主体为聚集分布,是环境因素的作用结果。桉蝙蛾幼虫在不同虫口密度下最适抽样数公式n=t2(1.1/m+0.6744)/D2和序贯抽样决策限模式:T'0(n),T″0(n)=n±1.332槡n(取m0=1)。[结论]研究结果为桉蝙蛾的调查取样和预测预报工作提供了科学依据。

[Objective]The paper was to study the spatial distribution of Endoclyta signifer Walker Larva.[Method]The larvae distribution in Eucalyptus plantation in Beiliu and Luchuan counties of Guangxi province were investigated.Ten standard plots were set,and the spatial distribution pattern of E.signifer larva was confirmed using six different aggregation indices and regression analysis.[Result]The larvae mainly distributed in the base of trunk lower than 1 m,and its spatial distribution pattern was mainly aggregative distribution,which was caused by the environmental factors.The optimum sampling formula of E.signifer larva under different population densities was n = t2（1.1/m ＋0.674 4） /D2,and limited decision-making sequential sampling model was T’0（n）,T″0（n） = n ±1.332 n^（1/2）（m0 =1）.[Conclusion]The result provided scientific basis for sampling and forecasting of E.signifier.