Abstract:

With the economic globalization speeding up, invasion of the alien species resulted in very serious harm and huge economic losses for ecological environment in China.In the target region,risk evaluation of invasive species is the precondition of reasonable quarantination and implementation of scientific planning,while potential geographic distribution of invasive species in the target region is the foundation of scientific risk evaluation of invasive species. Ecological niche models(ENMs)，which are widely applied to predict the potential geographic distribution of species，provide an important tool to quantify the risk evaluation of invasive alien species．One of the frequently discussed issues is how to evaluate the effectiveness among different models. In this article, four common ecological niche models were introduced and their advantages and disadvantages were discussed.Using known distribution and the environmental data,MAXENT and GARP produce ecology demand of species based on ecology position, then study biodiversity and potential distribution of species; CLIMEX is to forecast the potential geographic distribution of species by climate parameter collected from the known geographic distribution region of that species.EI value generated from CLIMEX,which is a relative value,has reflected relative abundances of the species in the region,and can be expressed by the graph.GIS can construct potential geographic distribution of invasive species in the target region and unify with other models. This ability mainly depends on its two functions: Interpolation and superimposition.With all this knowledge of the four models, researchers can wisely and effectively choose the model(s) to meet their requirements.