中国梨木虱生命表的研究

STUDY ON THE LIFE TABLE OF CHINESE PEAR PSYLLID

1993—1994年在莱阳梨区对第1、2世代中国梨木虱自然种群进行了系统观察,组建了2个生命表,并对影响种群数量变动的一些因素作了探讨。经生命表分析得出,该虫第1、2世代种群的趋势指数分别为4.19和3.97;世代的存活率分别为5.82％和5.52％。通过存活曲线分析得出,该虫自然种群的存活曲线属Peral(1928年)Ⅲ型曲线,这表明,种群消亡的主要阶段为生命的早期;而实验种群则为Ⅱ型曲线。经Podoler和Rogers回归法测定,风雨的冲刷是导致死亡的关键因子。

Systematic observations on the 1st and 2nd generations of Chinese pear psyl-lid Psylla chinensis Yang et Li were carried out in Laiyang in 1993 - 1994, two natural population life tables were established and key factors affecting on its population dynamics were analysed. The population trend indices and survivals of its 1st and 2nd generations were 4. 19 and 3. 97, and 5. 82% and 5. 52%, respectively. The survival curve of its natural population tallied with Peral's Curve I , i.e. its population declines mainly in the early stage of life, while that of its experimental population accorded with Peral's Curve I . The results of key factor analysis showed that wind and rain are the main lethal factors of this insect pest.