关键词: 集合种群, 剩余环境容量, 非线性动力模式, 天津七里海湿地

Abstract: Researches on species extinction caused by the shrink or loss of habitat are one of the hottest points of biological study, in which numerous biological scientists have been involved. The Tianjin Qilihai Wetland was set to example to simulate the mechanism between habitat destruction and species richness. This research combined theoretical research with numeral simulation and set up the evolutional model of exponent upon the effect of human activities. 1) The exponent value of dis defined as the coefficient value of the interaction between species and environment and it can be applied to research the evolutional mechanism of different meta-population. When the condition of d<1 is met, the effect of environment on meta-population is beneficial to the development of species and habitat destruction will not lead to species extinction. While the condition of d>1 is met, the strongest species will be driven to extinguish owing to the decrease of content of habitat and the system will reach new state in a short time. The bigger the value of d is, the shorter of time system reach new state is. 2) The third mechanism of extinction of meta-population, the coordinate law of evolution and degradation of species in the restoration of destruction habitat are also found, which is the same evolutional trait of different species. The evolutional law between the restoration and destruction of habitat has same points and differences.

Key words: meta-population, remnant environment volume, nonlinear dynamic model, Tianjin Qilihai wetland