感染浓核杆菌HaDNV-1的棉铃虫种群动态分析

Analysis on the population dynamics of Helicoverpa Armigera infected by HaDNV-1

为分析棉铃虫的繁殖生长和传播规律,考虑棉铃虫天敌的影响,建立了一个3种群捕食与竞争模型,改进了现有的棉铃虫种群竞争模型.通过分析模型平衡点的稳定性,了解HaDNV-1病毒对棉铃虫种群动态的影响.结果表明:在不考虑HaDNV-1对棉铃虫的危害时,感染型棉铃虫将会与天敌共存,而正常棉铃虫趋于灭绝;在考虑HaDNV-1对棉铃虫的危害时,得到了使得感染棉铃虫与正常棉铃虫共存的条件,对现有文献中发现的感染型棉铃虫种群变化规律给出了合理的解释。

For analyzing the breeding and propagation of cotton bollworm, we present three models of species prey competition un-der the condition of the impact of the natural enemy for cotton bollworm, and we also modify the previous model of species com-petition for cotton bollworm. Based on the stability analysis of the equilibrium point for the models, we realize the effects of HaD- NV-1 for the population dynamics of cotton bollworm. The research results indicate that the infected cotton bollworm can stay with the natural enemy without regard to the negative effects of HaDNV-1 for cotton bollworm, but in that condition, normal cotton bollworm must be tend to extinction At same time, we achieve the condition of coexistence for infected cotton bollworm and normal cotton bollworm when we consider the negative effects of HaDNV-1 for cotton bollworm, besides that, we present the reasonable explanation for dynamics of population growth of the infected cotton bollworm in previous references.