秋大豆栽培地斜纹夜蛾卵块分布型研究及卵量调查

运用6个聚集度指标和2种回归分析法，对23块秋大豆栽培地斜纹夜蛾卵块空间分布型进行判定。调查结果表明，卵块聚集、均匀和随机分布型地块数分别为11块、11块和1块；区域调查8次，其中聚集分布6次、均匀分布2次；测得聚集度均数小于2，分析聚集原因是环境引起，提出以立地条件分层抽样调查卵量较好。

Research on Distribution Patterns and Amount of Prodenia litura Eggs in Cultivation Fields of Autumn Soybean

This paper determined the spatial distribution patterns of Prodenia litura eggs in 23 cultivation fields of autumn soybean by using 6 aggregation indexes and 2 regression analysis methods. The results showed that, the field numbers of aggregation, uniform and random distribution pattern were 11, 11 and 1, respectively. Among the total 8 regional surveys, 6 were aggregation distribution and 2 were uniform distribution. The measured aggregation degree was less than 2, and the environment factors were reasons for the aggregation distribution. It was better to use stratified sampling method to investigate egg amount based on site conditions.