褐飞虱空间格局的地统计学分析

Geostatistical Analysis of Spatial Distribution of Brown Planthopper,Nilaparvata lugens

褐飞虱Nilaparvata lugens(Stl)是我国重要的迁飞性水稻害虫,对我国的水稻生产造成严重危害.为研究其迁入后田间的聚集与扩散的动态过程和空间分布规律,为综合防治提供理论依据,作者根据2009年在秀山县的田间系统调查资料,运用地统计学中的半方差函数,建立了褐飞虱发生期的空间变异曲线模型,并利用Surfer8.0软件对空间分布数据进行插值和模拟.结果表明,在本研究尺度下,褐飞虱各时间段均呈聚集分布,空间依赖范围约为49-132 m,变程随时间先减小,后增大;自水稻插秧开始,褐飞虱密度逐渐增大,8月20日达到最高峰,即该时段应是本地区防治褐飞虱的关键时期.

Brown planthopper,Nilaparvata lugens（Stl）,is a major immigration pest of rice crops in China causing great losses to rice production.Dynamic process and spatial pattern of the Nilaparvata lugens after they immigrated into rice field were studied to provide a theoretical basis for its integrated control.Models of space variation were constructed based on the geostatistical method by using survey data during the incidence period of Nilaparvata lugens in Xiushan,Chongqing in 2009.Isoclines maps of Nilaparvata lugens at each stage were created by the geostatistical software Surfer8.0 with Kriging interpolation.The result showed that the spatial pattern was clumped at each stage and spatial dependences were 49-132 m and the range decreased at first and then increased later.The density of Nilaparvata lugens increased gradually since rice planting and reached the peak on about 20 Aug.,which should be critical period for the control of Nilaparvata lugens in the region.