中国梨木虱生命表的研究

STUDY ON THE LIFE TABLE OF PSYLLA CHINENSIS

１９９３～１９９４年在莱阳梨区对第一、二世代中国梨木虱自然种群的生命表进行了研究，并对影响种群数量变动的因子作了探讨。结果表明，中国梨木虱第一、第二世代种群的趋势指数分别为４．１８９和３．９７４；世代的存活率分别为５．８１８％和５．５２％。通过存活曲线分析得出，中国梨木虱自然种群的存活曲线属Ｐｅａｒｌ（１９２８）提出的Ⅲ型曲线，这表明，种群消亡的主要阶段为生命的早期；而试验种群则为Ⅱ型曲线。经Ｐｏｄｄｅｒ和Ｒｏｇｅｒｓ回归系数法测定，风雨的冲刷是导致死亡的关键因子。

In 1993～1994 Systematic observations on 1st and 2nd generations of Psylla chinensis Yang were carried out in Laiyang,the natural population life table were established. The trend indices of population of 1st and 2nd generations were 4.189 and 3.974, the survival were 5.818% and 5.52%.The survival curves from the netural population belonged to the pearl's type Ⅲ;the expermental population belonged to type Ⅱ.According to the Podoler and Rogers of regressive mothod, the wind and rain were the key factors affecting population dynamics of 1st and 2nd generations.