不同湿度下白背飞虱实验种群生命表

本文分析了五种湿度梯度条件下白背飞虱的种群增长,并组建了实验种群生命表。结果表明:在相对湿度43%—100%范围内,卵、若虫历期差异不显著;卵孵化率、若虫存活率、世代存活率、成虫产卵量和寿命、内禀增长力和种群趋势指数随湿度的增加呈抛物线趋势。卵孵化、若虫存活、世代存活的最适湿度范围为80%—92%,在80%的相对湿度下,成虫寿命最长,产卵量最多,不产卵的个体最少。

ON THE EXPERIMENTAL POPULATION LIFE TABLE OF WHITEBACKED PLANTHOPPER UNDER DIFFERENT HUMIDITY CONDITIONS

In this paper,the population dynamics of white-backed planthop-per Sogatella furcifera(Horvath)under different humidity conditionswere analysed,and an experimental population life table was developed.The results showed that under the relative humidity ranged from 43% to100%,there were no significant differences among the durations of eggor nymph stage,whilst the hatching rate of egg,survival of nymph andthe whole generation,fecundity and lifespan of adult,intrinsic rate ofincrease and population trend index exhibited parabolically increasewith the humidities.The optimum relative humidity for hatching of egg,survival of nymph and the whole generation were ranged from 80%-92%.Under 80% of relative humidity cgndition,the lifespan of adult waslongest,its fecundity was highest,and the individual number laid no eggwas fewest.