食饵种群具有常收获或常投放时的二维Volterra系统的拓扑结构

A Topologccal Structure Analysis of the Two-Dimensional Volterra System with a Constant Harvest Rate or a Constant Invest Rate of the Prey Species

给出了食饵种群具有常收获或常投放时的二维Volterra系统x·=x(a10 -a11x -a12 y) -h ( -∞ <h <+∞ )y·=y( -a2 0 +a2 1x-a2 2 y)(a10 >0 ,a11>0 ,a12 >0 ,a2 0 >0 ,a2 1>0 ,a2 2 >0 )在第一象限内所有可能的拓扑结构 ,并分析了它们的参数条件 ,从而改进了文 [1

In this paper, we give all the topological structures of the system x·=x(a 10 -a 11 x-a 12 y)-h,y·=y(-a 20 +a 21 x-a 22 y),(-∞<h<+∞), in the fivst quadrant and analysis thier coefficient conditions. Also, we improved the work of an earlier article.