油桐尺蠖幼虫种群空间分布格局及其抽样技术

Spatial Distribution Pattern of Buasra suppressaria Guenee in Eucalyptus Forest and the Sampling Method

应用聚集度指标法、Iwao法和Taylor法等昆虫空间分布模型对油桐尺蠖幼虫空间分布格局进行测定检验,结果表明油桐尺蠖幼虫呈聚集分布,聚集强度随种群密度增加而增加。应用Iwao抽样模型确定油桐尺蠖幼虫在不同密度下的理论抽样数,并提出了最佳理论抽样数和序贯抽样模型,根据模型判断林间最佳油桐尺蠖幼虫防治时机。

We tested the spatial distribution pattern of Buasra suppressaria Guenee in Eucalyptus forest. The testing method included the aggregated indices method, Iwao method and Taylor power law method. Those three methods showed that the distribution pattern of B.suppressaria was the assemble distribution type.Moreover, the assemble distribution index increased along with the increasing of their population density.Based on the distribution pattern, we determined the theoretical sampling number at different densities,proposed the optimal theoretical sampling number and sequential sampling model, and then determined the optimal control time according to that model.