【摘要】 利用平均 Liapunov函数法研究了 n种群食物链系统的永久持续生存问题 ,当外界对环境的毒素排放是周期函数时获得了种群永久持续生存的条件。更多还原

【Abstract】 An n species food chain model in a polluted environment is discussed by means of average Liapunov function.Under the hypothesis that the exogenous input of toxicant into the environment is periodic in time,the condition for permanence of populations is obtained.更多还原