棉铃虫成虫种群空间结构的研究

A study on spatial structures of the adult population of the cotton bollworm(Helicoverpa armigera)

利用性诱捕器调查了棉铃虫越冬代至 3代棉铃虫成虫种群的种群密度 ,而后用 4种地统计模型拟合其种群的空间结构 ,并分析它们的空间关系 ,其结果如下 :( 1 )越冬代种群在全方位、90°及 1 3 5°方向上空间模型均为线型 ;在 0°及 4 5°方向上分别为球型和指数型 ,模型的参数表明越冬代成虫的空间相关距离为 6.0 1～ 8.0 1空间单位 (单位为 1 0 0 m,下同 ) ,异质系数为 54.60～ 83 .50 ,空间依赖度为 1 50 .0 0～ 1 80 .60。 ( 2 )一代种群在全方位、0°、4 5°、90°及 1 3 5°方向上的空间模型分别为线型、球型、线型、球型和球型 ;模型的种群参数表明一代成虫的空间异质系数是 53 6.0 0～ 588.1 0 ,相关距离为1 6.0 2～ 1 9.0 7空间单位 ,空间取样方差约是 2 60 0。 ( 3 )二代成虫在全方位、0°和 4 5°方向的空间模型均为指数型 ,在 90°及1 3 5°方向的模型均为球型 ;模型的参数表明二代成虫的空间异质系数为 5.56～ 2 5.93 ,空间取样方差是 53 .4 9～ 64 .96,相关距离为 4 .54～ 5.3 3空间单位。 ( 4)三代种群在全方位、0°、4 5°、90°及 1 3 5°方向的模型分别为指数型、球型、指数型、线型和指数型 ,模型的参数表明三代成虫的空间异质系数为 2 91 .93～ 4 93 .67,空间取样方差为 1 1 99.53～

The densities of adult population were investigated by pheromone\|trap from the overwintering generation to the third generation.The spatial models would be simulated by four types of models in geostatistics,and simultaneously their spatial relationships were also analyzed,the results could be made:(1)In the overwintering generation,the spatial structures were simulated by linear models in the directions of omnidirection,90° and 135°;but the spatial structures were described by spherical model and exponential model,respectively,in the direction of 0° and 45°.The ranges of spatial were 6.01～8.01 units(per unit is 100 m),the sample variance were 150～180,the degrees of heterogeneity were 54.6～83.5.(2)In the first generation,the spatial structure were simulated by linear models in the directions of both omnidirection and 45°,but each of spatial structures were exhibited spherical models in the other three directions:0°,45° and 135°.The ranges of spatial dependence were 16.02～19.07 units,the sample variance were 2600 or so,the degrees of heterogeneity were 536.10～588.10.(3)In the second generation,models of the spatial structures were exponential with the exceptions of the directional analyses in the other two directions (90°,135°),which were spherical models.The ranges of spatial dependence were 4.54～5.33 units,the sample variance were 53.49～54.96,and the degrees of heterogeneity were 5.56～25.93.(4)In the third generation,the spatial structures were simulated by exponential model in three directions:omnidirection,45° and 135°,but the spatial model was spherical in the direction of 0°,and the model was linear in the direction of 90°.The ranges of spatial dependence were 4.31～5.33 units,the indexes of spatial dependence were 1199.53～2311.72,and the degrees of heterogeneity were 219.93～610.64.