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运用 7种聚集度指标 ,测得杨小舟蛾第 1,3代卵块在杨树林内的空间分布型属均匀分布 ;第 1代幼虫属均匀分布 ,第 3,4 ,6代幼虫属聚集分布。通过方差分析 ,F检验和SSR测验表明 ,杨小舟蛾第 1,3,4 ,6代幼虫在树冠东、南、西、北 4方位间虫口数量差异均不显著 ;第 1,3,6代幼虫在树冠上、中、下 3层间虫口数量差异均不显著 ,第 4代幼虫在树冠上、中、下 3层虫口数量差异为 :上层与下层及上层与中层间差异均极显著 ,中层与下层间差异显著
The spatial distribution patterns of the first and the third generation eggs of Populus simonii were evenly distributed in the poplar forest with seven kinds of aggregation indexes. The first generation of larvae were evenly distributed, and the third, fourth and sixth generations of larvae were clustered and distributed. Analysis of variance, F test and SSR test showed that the number of larvae of 1st, 3rd, 4th, There was no significant difference in the number of larvae among the upper, middle and lower three layers of the larvae. The larvae of the 4th generation larvae had the highest numbers of upper, lower and upper larvae in the upper, lower and upper larvae, The difference between the middle and the lower is significant