【摘要】 本文对外来入侵害虫扶桑绵粉蚧Phenacoccus solenopsisTinsley雌成虫在大花马齿苋(Portulaca grandiflora Hook)上的空间分布特征进行了研究。结果表明,在水平上的空间分布表现为聚集分布,个体间相互吸引,分布的基本成分为个体群;雌成虫密度m和平均拥挤度m*间的回归方程为:m*=12.4595+1.2649m;雌成虫在大花马齿苋枝条上、中层虫口数量均显著多于下层。确定了不同虫口密度及不同允许误差下的最适抽样数。更多还原

【Abstract】 The spatial distribution of the female adults of Phenacoccus solenopsis Tinsley (Hemiptera:Pseudococcidae) on Portulaca grandiflora Hook was studied.The results show that the spatial distribution of P.solenopsis was highly aggregative with reciprocal attraction among individuals.The basic component of distribution was the individual group;the linear regression line had an equation of the form m =12.4595+1.2649 m,where m is the mean crowding and m is the density of female adults.Furthermore,the number of P.solenopsis on the upper or middle part of plants was significantly greater than on the lower part.Lastly,the theoretical sampling numbers of female adults of P.solenopsis were determined under different population densities allowing for sampling error.更多还原