摘要
采用聚集度指标的方法对麦长管蚜种群空间格局进行了初步研究，结果表明麦长管蚜在麦田中的分布为聚集分布，聚集与环境条件和麦蚜本身的聚集行为有关。在５月上旬和６月下旬，各有１个聚集高峰。聚集与扩散趋势呈周期性变化。提出根据公式λ＝１．７１５６［－ｌｎ（１－ｐ）］１．０９２１，由有虫株率估计麦蚜种群密度，并给出了以有虫株率来确定田间发生程度的序贯抽样图。
The spatial pattern of Sitobion avenae(Fabricus)in wheat fields was studied by the methods of aggregation indices.The result showed that the spatial pattern of S.avenae was aggregated among wheat plants and the aggregation pattern resulted from the environmental condition and the behavior of wheat aphid.S.avenae had an aggregation peak in early May and late June,respectively.The aggregation intensity of wheat aphid population showed a tendency of periodical oscillation with time sequence.It was presented that the occurrence probability in wheat plants could be used to estimated the wheat aphid population density according to the equation:=1.7156 1.0921..The sequential sampling diagram was drawn to investigate the wheat aphid population levels in wheat fields.
关键词
麦长管蚜
空间格局
密度
序贯抽样
种群
麦
蚜虫
Sitobion avenae,spatial pattern,density estimation,sequential sampling
