摘要
本文采用龄周期法与分世代隔离观测法相结合的方法研究了绿豆田豆蚜自然种群特定年龄生命表,共获得了8个世代的数据。分析结果表明,影响豆蚜自然种种群动态的主要因素是风雨及天敌;低龄若蚜受风雨的影响,一次大风雨可使其种群数量减少30～60％以上,高龄若蚜及成蚜则受天敌和风雨共同作用。文中还讨论了这两种研究方法的不足之处。
Froml991 to 1992, the age-specific life table of cowpea aphid was studied on its natural population in mung bean field,applying the method of a combination of instar-period and seperated observation of two continuons generations. Data of eight generations were obtained. The results showed that the main factors affecting the dynamic of natural population were wind,rain and notural enemies. Young nymphae were mainly controlled by wind and rain,more than 30-60% of the population could be lost after a rainstorm. Other immturities and adults were affected jointly by natural enemies,wind and rain. The disadvantages of two methods were discussed in the paper.
关键词
豆蚜
自然种群
生命表
Aphis cracctvora
natural population
life table
