玉米田龟纹瓢虫成虫空间分布及抽样技术研究

Study on The Spatial Distribution and Sampling of Propylaea Japonica(Thunberg) in Corn Field

对龟纹瓢虫成虫在玉米田的空间分布型进行了研究。结果表明,应用扩散系数等7种指标分析,确定了该虫的空间分布型为聚集分布,其聚集原因经Blackith种群聚集均数测定,在中高密度田是由龟纹瓢虫的群居习性所致;在低密度田是由环境因素(如蓟马的密度)引起的,并提出了最佳理论抽样数。

The spatial distribution of Propylaea japonica （Thunberg） adults were investigated in corn from April to May in 2007, 7 indexes such as the diffusion coefficient（c） etc. were analyzed, the spatial distribution was confirmed to be accumulation distribution. The reason of accumulation was the congregation habit of Propylaea japonica （Thunberg） in the middle and high density filed, and the environment factors（such as the density of bispinosa） in low density filed, it was tested through Blachkith average population accumulation. The best theoretical sampling was also presented in this paper.