摘要
通过采用种群的聚集度指数:C、1/k、λ、mx^(1/2)、L、Taylor冥法则和m对m的回归方法测定杨二尾舟蛾Cerura menciana Moore幼虫的空间分布型,并用不同的抽样方法比较了抽样精确度。杨二尾舟蛾幼虫在林内呈聚集分布,其聚集的原因是由环境因素所引起。幼虫空间分布的基本成份是个体群,个体间相互吸引。分析证明杨二尾舟蛾幼虫采用平行线和“Z”字型抽样方法误差最小。
By using of aggregation indexes such as C,λ,mx L, the power mettod oflaylor ana tne correlation between m and m. We have measured the spatial distribution pattern of Cerura menciana Moor. The sampling precise degrees have been compared by different sampling methods. The spatial distribution pattern of the larvae of Cerura menciana obeys aggregation distribution.The basic components of spatial pattern are colonies and the reason for the aggregation is condition of envirinment. The results show out that the error rate of sampling method of parallel rine and 'Z' form is the smallest.
关键词
杨二尾舟蛾
幼虫
分布型
抽样技术
Cerara menciana
Larvae
spatial distribution pattern
sampling method
