枣镰翅小卷蛾自然种群生命表的研究

１９８９－１９９３年在山西太谷枣区对枣镰翅小卷蛾的自然种群进行了系统调查，编制了１－３代５年的生命表及平均生命表。分析得出，第１代的卵和１－２龄幼虫是其世代及年度的薄弱环节；１－２代，２－３代，３代－翌年１代的种群趋势指数分别为２．４５、２．７和０．２１，在年份间种群由上升到平衡；第１代的风雨致死，第２代的４－５龄幼虫及蛹的虫寄生，越冬代（即第３代）的打枣致死、蛹期天敌取食及冬季消亡对种群的控制作用较大；用灰色关联度分析关键因子是作者提出的新方法，文中给出了详细的分析步骤，关键因子：第１代为４－５龄幼虫天敌取食，第２代为蛹期虫寄生，越冬代为４－５龄菌寄生和蛹冬季消亡。

STUDIES ON THE LIFE TABLE OF ANCYLIS SATIVA

In 1989-1993, systematic observations on 1st-3rd generation of Ancylis sativa Liu were carried out in Taigu County,Shanxi Province. Based on those investigatory data, 15 natural population life table,one average life table of 1st-3rd generations in five years were developed. The results showed as follows:1. The eggs and 1st-2nd instar larvae of 1st generation are a weak link of the life history and the generation;2. The trend index of population of 1st-2nd, 2nd-3rd and 3rd to next 1st generations were 2.45, 2.7 and 0.21, the populations in the life history were from going up to balance;3. The major controlling factors to the population were the death of 1st generation by rain and wind, of the 4th-5th instar larvae and pupae of 2nd generation parasitized by insects and of 3rd generation by picking fruit,natural enemies and dying out of winter;4. The key factors were the predation of natural enemies to the 4th-5th instar larvae 1st generation,the pupae of 2nd generation parasitized by insects and the 4th-5th instar larvae of 3nd generation parasitized by funguses and the pupae of 3rd generation dying out in winter;5. A new method suggested by the authors was what the key factor analysed by using the grey sequence degree.