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arXiv 1504.05486math.AP
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非均匀时间周期环境中具有自由边界的扩散竞争问题

The diffusive competition problem with a free boundary in heterogeneous time-periodic environment

Qiaoling Chen, Fengquan Li, Feng Wang

摘要:

本文研究了具有自由边界和变号内禀增长率的非均匀时间周期环境中的扩散竞争问题,该环境由密度为$u$的入侵种群和密度为$v$的本地种群组成.我们假设$v$在$R^{N}$中扩散和生长,$u$最初存在于球形$B_{h_0}(0)$中,但随着扩散前沿$\{r = h(t)\}$侵入环境。研究了扩散速率$d_1$、初始栖息地$h_0$、入侵物种$u$的初始密度$u_0$和参数$μ$(见(1.3))对该自由边界问题动力学的影响。得到了一个扩散-消失二分法,并给出了入侵物种扩散和消失的充分条件。此外,当$u$发生扩展时,也给出了扩展速度的一些粗略估计。

英文摘要:

In this paper, we consider the diffusive competition problem with a free boundary and sign-changing intrinsic growth rate in heterogeneous time-periodic environment, consisting of an invasive species with density $u$ and a native species with density $v$. We assume that $v$ undergoes diffusion and growth in $R^{N}$ , and $u$ exists initially in a ball $B_{h_0}(0)$, but invades into the environment with spreading front $\{r = h(t)\}$. The effect of the dispersal rate $d_1$, the initial occupying habitat $h_0$, the initial density $u_0$ of invasive species $u$, and the parameter $μ$ (see (1.3)) on the dynamics of this free boundary problem are studied. A spreading-vanishing dichotomy is obtained and some sufficient conditions for the invasive species spreading and vanishing are provided. Moreover, when spreading of $u$ happens, some rough estimates of the spreading speed are also given.

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