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论文类型：期刊论文

发表时间：2016-01-15

发表刊物：JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS

收录刊物：SCIE

卷号：433

期号：2

页面范围：1594-1613

ISSN号：0022-247X

关键字：Diffusive competition problem; Free boundary; Heterogeneous time-periodic environment; Spreading vanishing dichotomy

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-h0 (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 mu (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. (C) 2015 Elsevier Inc. All rights reserved.