Preliminary analysis on invasive species in Liaoning Province

Based on the field survey from 2006 to 2008 and literature review,the invasive species in Liaoning Province were summarized in this paper.The result indicated that totally 117 invasive species were identified in Liaoning.Among the invasive species,89 species were plants,17 species were pests,10 species were pathogenic microbes.In which,14 species were seriously harmful to environment and ecosystem.The spread of these invasive species were very fast and most of them were accidentally introduced to Liaoning.The ecosystem with simple structure was the main invading site such as crop land,pasture or planted forest,where the climate was warm and humid,and the biodiversity was rich.