不同寄主黑刺粉虱空间分布格局及其应用

Space Structure of A.spiniferus on the Different Hosts and its Application

调查及分析表明 :黑刺粉虱在不同寄主果树上均为聚集分布 ,分布的基本成分为个体群 ,个体群平均大小随密度增加而增大 ;在低密度下表现为高聚集 ,高密度时聚集度降低并趋稳定 ;聚集原因由本身习性或环境作用引起。其最适抽样数为 Iwao:n=t2 /D2· ( 1.83618/x+0 .0 0 146)和 Taylor:n=t2 /D2·1.784 5x-0 .980 1;利用零频率估计密度式为 :x=4 6.3893( P0 -0 .0 2 156- 1) ;序贯抽样模型为 Iwao:Tn=5n±t 9.2 174 n和 Taylor:Tn=5n± t 9.2 12

The results indicated that Aleurocanthus spiniferus showed the gather distribution on different host fruit trees and the basic component of distribution was an individual swarm. The size of the swarm increased with the increase of the density. The swarm showed a high clustering degree under the lower density and low clustering degree under a higher density. The reason of causing clustering is the natural habit of A. spiniferus and environment. The suitable sampling number is Iwao: n=t 2/D 2(1.83618/ +0.00146)and Taylor: n=t 2/D 2 1.7545 -0.9801 .The estimate density formula of zero frequency is = 46.3893 (P 0 -0.02156 -1). The sampling model of order sampling is Iwao: Tn=5n±t9.2174n and Taylor:Tn=5n±t9.2129n