摘要
通过聚集度指标法对宁夏银北地区二代林网中主要发生的枝梢害虫、光肩星天牛幼虫、木蠹蛾幼虫三类害虫进行测定，得知该三类害虫均呈聚集分布。通过Ｍ－Ｘ回归法，确定出理论抽样数和最大抽样量公式．并列出天牛序贯抽样分析表。
There has been no reports on the studies of pests interpopulation in mixed stands.The populations of Eulecanium kuwana and Parthenolecanium orientalis,Anoplophora glabripennis and the larvae of Cossus orientalis occurring in the forest nets of second generation in Yinchuan area,Ningxia province were measured by aggregation index method.It was found that the populations of these three insect pest showed aggregation distribution.The number of theoretic sampling and the formula of maximum sampling sas established by M-X regressional method.Ananalytical table of seqtlential sampling for longicorn was given,which provides scientific basis for the control of pest insects occuring in the forest nets of second generation.in Ningxia.
出处
《陕西林业科技》
北大核心
1996年第4期22-27,共6页
Shaanxi Forest Science and Technology
关键词
混交林
空间格局
分布型指数
序贯抽样
害虫
Mixed stand
Mixed population
Spatial distribution
Distribution index
Sequential sampling
