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含扩散与无限时滞的竞争型Lotka—Volterra模型的周期解与稳定性
引用本文:徐天华.含扩散与无限时滞的竞争型Lotka—Volterra模型的周期解与稳定性[J].重庆师范学院学报,2009(3):60-64.
作者姓名:徐天华
作者单位:四川民族学院数学系,四川康定626001
基金项目:四川省教育厅重点资助项目(No.08ZA044)
摘    要:研究了一类含扩散与无限分布时滞的竞争型Lotka—Voherra生态模型,利用对应特征值问题解的性质和比较原理,通过对应周期抛物系统δui(t,x)/δt-Aiui(t,x)=ui(t,x)ai(t,x)-bi(t,x)ui(t,x)],(i=1,2) 的周期解得到模型的上下解(u1,u2),(0,0),证明了模型在所对应的特征方程的主特征值σ1(ai)≥0,(i=1,2)时存在全局渐近稳定的平凡解,当σ1(α1)〈0,σ1(α2)≥0和σ1(α1)≥0,σ1(α2)〈0时分别存在全局渐近稳定的半平凡解(θ1(t,x),0)和(0,θ2(t,x))。并采用单调迭代技巧构造恰当的T-周期序列,证明了对任意的非负初始值,模型存在一对周期正解及其渐近稳定的条件。

关 键 词:扩散  无限时滞  上下解  全局渐近稳定  周期解

Stability and Periodic Solution to Competitive Lotka-Volterra System with Diffusion and Infinite Distributed Delay
XU Tian-hua.Stability and Periodic Solution to Competitive Lotka-Volterra System with Diffusion and Infinite Distributed Delay[J].Journal of Chongqing Normal University(Natural Science Edition),2009(3):60-64.
Authors:XU Tian-hua
Institution:XU Tian-hua ( Dept. of Mathematics, Kangding Nationality Normal College, Kangding Sichuan 626001, China)
Abstract:A competitive Lotka-volterra system with diffusion and infinite distributed delays is investigated. It is shown that the globally asymptotically stable trivial solution, when σ1 (αθ) ≥0, (i = 1,2 ), the globally asymptotically stable semi-trivial periodic solution (θt (t,x) ,0), and (0,θ2(t,x)) when (σ1 (a1) 〈0,σ1 (α2)≥0 and σ1(α1 ) ≥0,σ1 (α2) 〈0 of the models by construction of a pair of upper and lower solution (u1 ,u2) ,(0,0) of parabolic periodic systemδui(t,x)/δt-Aiui(t,x)=ui(t,x)ai(t,x)-bi(t,x)ui(t,x)] and in the use of eigenvalue theory and comparison principle. A T-periodic series are established by using the monotone iteration technique. It was obtained that the systems have a pair of periodic positive solutions with respect to every nonnegative initial function.
Keywords:diffusion  infinite delays  upper and lower solution  globally asymptotic stable  periodic solutions
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