本文研究了多重时滞富营养化生态模型的稳定性与分支问题。利用特征值方法，分别研究了具有单时滞和双时滞模型的线性稳定性。发现当模型中的时滞经过一系列临界值时，模型在平衡点附近经历了Hopf 分支和Hopf-zero 分支，并给出Hopf 分支和Hopf-zero 分支存在的充分条件。最后数值模拟验证了理论结果。%In this paper, the stability and bifurcation problem of eutrophication ecological model with two time delays is studied. By using the eigenvalue method, we study the linear stabilities with one delay and two delays, respectively. It is found that Hopf bifurcations and Hopf-zero bifurcations exist at the equilibriums when the delays pass through a sequence of critical values. The sufficient conditions of the existence of Hopf bifurcation and Hopf-zero Bifurcation are obtained. In the end, some numerical simulations are carried out for supporting the analytic results.
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