摘要
萧氏松茎象HylobitelusxiaoiZhang是我国近年来发现的危害松林的新害虫。该文利用Iwao等 7种方法对萧氏松茎象幼虫的空间分布型进行了测定。结果表明 ,萧氏松茎象幼虫在林间呈聚集分布 ,且符合负二项分布 ,由此得出了林间理论抽样数公式 ,其抽样方式以对角线最佳 ;其有虫株率与平均虫口密度之间的关系可用冥函数曲线方程 :Y =2 91 6X0
Seven methods were used to determine the larval spatial pattern of Hylobitelus xiaoi Zhang in Pinus elliottii Engelm. The results showed that the spatial pattern fitted the negative binomial series and the larvae had a clumped spatial distribution. The formula for determining the optimun theoretical sampling number is provided. The average errors of several sampling methods for sampling larval populations in the field were compared, and the single diagonal method was the best. There was a significant relationship between the rate of infested pine trees( X ) and mean larval density( Y ), which can be described by the equation: Y=2 916X 0 887 .
出处
《昆虫知识》
CSCD
北大核心
2003年第6期556-560,共5页
Entomological Knowledge
基金
国家林业局"萧氏松茎象系统控制技术区试"项目的部分内容
