美国白蛾自然种群生命表的组建与分析

为了研究美国白蛾自然种群消长动态,采用作用因子组建了美国白蛾1年连续3个世代自然种群生命表,并对美国白蛾种群生命表进行了研究和讨论。结果表明,美国白蛾种群数量发展趋势指数第一代最高为230.39,第三代最低为43.97;寄生天敌是影响第一、二代美国白蛾自然种群的重要因子,第三代重要因子是自然死亡和寄生天敌,并且寄生天敌对美国白蛾的排除作用控制指数逐代升高,第一代最低为1.150,第三代最高为1.862。白蛾周氏啮小蜂是寄生美国白蛾的优势种。该结果为美国白蛾预测预报、综合防治提供理论依据。

Construction and Analysis of Natural Population Life Table of Hyphantria cunea

In order to study the natural population dynamics of Hyphantria cunea, the acting factors were used to build a life table of natural populations of Hyphantria cunea in three generations within a year, and the life table was studied and discussed. The results showed that the population trend indexes of the first and third generation were 230.93 and 43.97, which were the maximum and minimum, respectively. Parasite enemy was the important factor influencing the first and second generation of Hyphantria cunea, and both natural death and parasite enemy were the important factor influencing the third generation. Furthermore, exclusion index of population control (EIPC) of parasite enemy of the first generation was the lowest (1.150), and that of the third generation was the highest (1.862). Chouioia cunea (Hymenoptera: Eulophidae) was the dominant species. The results provide a theoretical basis for the comprehensive prevention and forecast of Hyphantria cunea.