橙斑白条天牛幼虫空间分布的地理统计学分析

Geo-statistical analysis of spatial patterns of Batocera davidis larvae

橙斑白条天牛是杨树的一种新害虫。应用地理统计学分析方法,研究了该虫的空间分布特点。结果表明,橙斑白条天牛幼虫在杨树林间呈聚集分布,种群在样地内具有明显空间依赖性,空间聚集范围在10-13 m之间。根据不同样方天牛幼虫种群的变程,南→北方向的相关距离大于东→西方向,说明天牛幼虫在林间的聚集斑块不是圆形的,而是南→北方向比东→西方向长,南→北方向是种群聚集的主方向,也是种群扩散的主要方向。这为该虫的监测和预测预报提供了科学依据。

Batocera davidis Deyrolle is a new poplar pest. Gcostatistical methods were applied to measure and analyzed the spatial pattern of B. davidis larvae. The results showed that the population spatial pattern displayed an aggregation model with significantly spatial dependence. Spatial range of aggregation fluctuated from 10 to 13 m in the all sampling sites. Based on the variogram model parameters, it was found that the relative distance was more in the orientation from south to north than from east to west. It was suggested that the aggregative spot of this pest population was not rounded, however, it was longer in south-north orientation than in east-west orientation. It could be so concluded that the pest population dispersals and aggregates mainly in south-north orientation. It has offered a scientific basis for the monitoring and prediction of B. davidis.