Emergency Recovery Mechanism Analysis and Research on Attacked Ecosystem
The Land utilization,climate change,nitrogen deposition,Carbon dioxide can lead to loss of habitat with invasion of alien species can be seen as a variety of attacks on ecosystem.Studying emergency recovery strategy under the interference ecosystems has an important practical significance for ecological system protection.In this paper,we firstly establish ecological system of the network model.It attributes the response of attacked ecosystem to network invulnerability and crashes in the process of the ecological network model cascading failure.Secondly,use the species load,capacity,maximum load and recovery probability to research on network cascade failure on the condition of emergency and the interaction between these indicators with the invulnerability and the speed of network collapse.Finally,for a certain broad leaf mixed forest ecological system,it shows that the stability threshold rh and βh of ecological system occur cascade failure are 0.35 through numerical simulation.When r ＞ rh or β ＞ βh,the extinction of key species will not cause large scale network cascade failure and collapse and r ＜ rh or β ＜ βh the extinction of key species are more likely to lead to the network paralysis.The research conclusion provide a scientific basis for ecosystem protection.
NETL
NSTL
万方数据
维普
