Establishment and application of risk assessment index system for alien plants invade mangrove ecosystem

Based on the literature review and field survey, combining previous research achievements on the alien species invasion risk assessment, according to the characteristics of alien plant invasion of mangrove ecological, we have structured risk assessment index system for alien plants invade mangrove ecosystem. This index system consists of 5 parts, 17 indicators, from introduction stage, optimal growth stage, diffusion phase, harm stage to evaluate prevention stage. And take for example the invasion of Spartina alterniflora in Guangxi mangrove wetland, its risk score is 85, high risk. Spartina alterniflor should be banned to introduce and carry out quarantine.This system can reflect the alien plant risk grade level objectively.