葡萄跳叶甲和捕食性天敌草间小黑蛛的空间格局及其联系

利用地学统计学原理和方法分析了葡萄跳叶甲种群和草间小黑蛛种群之间的空间结构和空间相关性。结果表明:不同时期葡萄跳叶甲种群的空间格局均呈聚集分布,其半变异函数皆为球型曲线,变程在1.164～8.508之间;不同时期草间小黑蛛种群的空间格局也均呈聚集分布,其半变异函数也皆为球型曲线,变程在2.977～7.799之间,两者变程在大多数时间变动趋势基本一致,充分说明了草间小黑蛛种群对葡萄跳叶甲在空间位置上具有一定的追随关系;用聚集强度指标分析,两者空间格局一致。草间小黑蛛聚集行为是环境因子所致,葡萄跳叶甲密度小于2头/株时,聚集原因是环境因子,密度大于2头/株时,本身密度是聚集的原因之一。

Spatial construction and relationship between Haltica chalybea and its predatory natural enemy, Erigonidium graminicola

The study on spatial construction and relationship between Haltica chalybea(Illiger)and its predatory natural enemy Erigonidium graminicola was conducted by using geostastics from May to August,2004.The spatial construction of Hamtica chalybea(Illiger)and Erigonidium graminicola showed aggregated distribution at different periods and their semi-variance models were describedly spherical.The ranges of spatial dependence of Haltica chalybea(Illiger)and Erigonidium graminicola were 1.164-8.508 and 2.977-7.799 respectively.The space patterns between two analyzed by the indices of the aggregation degree were consistent of spatial dependence between them was nearly coincidence at different periods.Erigonidium graminicola followed Haltica chalybea(Illiger)on populations and space.The space patterns analyzed by the indices of the aggregation degree were consistent.The action of E.graminicola aggregation is the result of some environmental factors.And also the reason of the aggregation of H.chalybea for its density less than 2 capitals per plant is due to some environmental factors.But for H.chalybea with density more than 2 capitals per plant,the density itself is one of the reasons of its aggregation.