环境污染模型中N种群的持续生存与绝灭

The Persistent and Extinctin of N-Population in a Polluted Environment Model

本文研究了一般环境污染模型（Ｍ１），得到了Ｎ种群持续生存与绝灭的阈值定理，该定理推广了文［１］的结论；最后，得到了Ｎ种群弱平均持续生存的一个充分条件。

In this paper,we discuss a general polluted environment model(M 1) and obtain the threshold of N-populations between persistence and extinction.This result extends what is stated in paper ;And we finally set a sufficient condition under which populations are weakly persistent in the mean.