种群数量控制指数及其应用

本文在Morris-Watt种群数学模型的基础上提出种群数量发展趋势的控制指数。控制指数是控制因子对种群生命系统控制作用的指标,以作用于系统内部组分引起的存活率的倒数表示,或以作用后的存活率与原来的存活率的比值表示。控制指数值即为引起种群数量发展趋势发生改变的倍数。文内以稻纵卷叶螟、褐稻虱和三化螟为例,应用控制指数,讨论天敌、杀虫剂和插植期对害虫种群生命系统控制的作用。控制指数有助于研究害虫防治的策略问题。

THE CONSTITUTION AND APPLICATION OF POPULATION CONTROL INDEX

In this paper,an index of population control (IPC) is proposedfor evaluating the effect of control factors on life system of popula-tion.It is expressed by the reciprocal of survival rate caused by theact on intrinsic components of system,or the survival ratio of thatafter action to the original.That is to say,IPC is the multiple caus-ing change of population dynamic trend.By applying IPC,the ricecase worm Cnaphalocrocis medinalis,rice brown planthopper Nilaparvatalugens,and paddy stem borer Scirpophaga incertulas were used as exam-ples to discuss the effects of natural enemy,insecticide,and trans-planting time on life system control of insect pest population.The IPCis contributed to the study on integrated pest control strategy.