褐稻虱自然种群生命表的组建方法

METHOD TO CONSTRUCT THE NATURAL LIFE TABLE OF Nilaparvata lugens STAL

本文把褐稻虱种群按其生长发育顺序划分为卵（E）、1－2龄若虫（S）、3－4龄若虫（L）和成虫（A）4个阶段，把各阶段的作因子划分为相对独立的状态（staltes)，在稻田调查中分别记录其单位面积的数量。通过换算，计算卵、1－2龄若虫和3－5龄若虫的存活率（Sg,Ss,Sl)及各作用因子相对应的存活率（S1，S2，S3，S4，S5，S6），同时通过实验种群的产卵量（FPfP），成虫逐日产卵概率（Pn)和自然种群成虫逐日存活率（AAa)组成的下代卵量概率，∑Pfl(SAa)′组成褐稻虱自然种群生命表的各个组分，如果包含成虫迁移后的居留率St,则根据生命表组分建立的种群趋势数字模型(Morris-Watt种群数学模型^[7,10,11])可扩充为：I＝SESSSLFPFP♂St∑Pfl(SAa)协′I＝S1S2S3S4S5S6FPFP♀St∑Pfl(SAa)′。

This paper deals with a method to construct the natural life table of Nilaparvata lugens stal by the data of field samplings and investigations on the survival rates of egg (SE) , 1st - 2nd instars and 3rd - 5th instars of the nymph stages (Ss and SL) and the operative factors (S1, S2, S3, S4, S5,S6) . Besides the fecundity coefficient from the investigation on an experimental population (FPFP♀),the product of the survival rates of adult stage per day (SAa)1 and the fecudity rates per day, (PH, ΣPH (SAa)1, and the residency rate after migration of the adults (St) are introduced as a component of the adult stage into the life table. And thus, the mathematical model of population trend (Morris-Watt mathematical model ) may be expanded as follow: