Abstract: Analysis of historical data indicated that the number of immigrants caught under light trap during early August and the peak size of immigration generation observed in late rice fields were significantly related to the peak size of the fourth generation, but not to the peak size of the fifth generation in Jiaxing, Zhejiang. A simulation study revealed that the population dynamics after immigration can be affected directly or indirectly by three characteristics of immigration including total immigrants, starting time and pattern through density dependent effects and the changes in living conditions for immigrants and their descendants. In consequence, the forecasting can be improved by understanding interactions between immigration population and other enviromental factors.

Key words: Brown planthopper, Population dynamics, Immigration

摘要： 历史资料分析表明，浙江嘉兴8月上旬灯下褐飞虱诱虫量和连晚田间迁人代高峰虫量与四代高峰虫量显著相关，但与主害代高峰虫量的相关性不显著。模拟研究揭示迁人种群的初始迁入时间、迁入总虫量和迁入格局等三个特征均可通过密度制约作用和改变迁入成虫及其后代所处生态条件而直接或间接地影响到迁入后种群的增长动态。因此，加深对迁人种群与环境因子综台作用的理解，将有助于提高预测准确性。

关键词: 褐飞虱, 种群动态, 迁人种群