具有脉冲作用的捕食系统的研究
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摘要
本文利用脉冲微分方程理论对几个捕食系统进行了研究,讨论了种群模型的持久性及其稳定性.全文共分为三章.
     第一章绪论,我们介绍了本文的研究背景和主要工作以及预备知识.
     第二章主要研究具有脉冲作用的捕食系统.首先讨论了一类具有Beddington-DeAngelis型功能反应的捕食系统.在此系统中,通过对捕食者(天敌)施行周期投放,对食饵(害虫)施行周期捕获的策略来控制害虫,利用脉冲微分方程的Floquet理论和比较定理,得到了食饵灭绝周期解的存在性和局部渐近稳定性的充分条件,以及种群持续生存的条件.其次,讨论了食饵具有脉冲捕获,捕食者具有阶段结构的Leslis-Gower HollingⅡ功能反应的Gomportz捕食模型,通过利用由频闪映射决定的离散动力系统,以及脉冲方程的比较定理,得到了相应的临界条件以确保捕食者灭绝周期解的全局吸引和所讨论系统的持久性.最后,基于综合害虫管理,提出并研究了一类具有脉冲效应和Ivlev类功能反应的两个捕食者一个食饵系统,利用脉冲微分方程的理论,得到了种群灭绝和持续生存的充分条件.
     第三章讨论了一类具有性别偏食现象和阶段结构的HollingⅡ类功能反应食饵捕食者模型,利用对不等式放缩得到了种群一致持续生存的条件,通过构造liapunov函数证明了系统周期解的全局渐近稳定性.
In this paper, by use of the theory on impulsive differential equation, we study some predator-prey systems and discuss the permanence and stablity of population ecological models. The article is divided into three chapters.
     In Chapter 1, We introduce some knowledge of biology mathematics, the main works and some prelimineries.
     In Chapter 2, we study predator-prey system with impulsive effects. At first, the article dis-cussed a predator-prey system with the Beddington-DeAnglis functional response, controlled the pest by using the stratege which is periodically releasing predator (natural enemy) and periodi-cally capturing prey (pest). By using the Floquet theory of impulsive equation and comparison theorem, we obtain sufficient conditions of the locally asymptotical stability of prey-extinction periodic solution and the permanence of the system. Next, we consider a predator-prey model with Leslie-Gower Holling II type schemes and Gomportz which has periodic harvesting for the prey and stage-structured for the predator. By use of the discrete dynamical system deter-mimed by the stroboscopic map and the comparison theory of impulsive equation, we obtain some corresponding threshold conditions which guarantee the globally asymptotical stability of predator-extinction periodic solution and the permanence of this system. At last, based on the integrated pest management program, a predator-prey system with impulsive effect and Ivlev functional response is studied. By using the Floquet theory of impulsive equation and comparison theorem, sufficient conditions for the population to be extinct and permanence are given.
     In Chapter 3, a predator-prey model with sexual favoritism is considered which has stage-structure and Holling II functional reponse. conditions of permanence for the system were obtained by constructing inequality. the global stability of the periodic solution were approved by Liapunov method.
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