Present status and management strategies of alien invasive plants in Guangdong Province.

In Guangdong Province,there are 93 species of alien invasive plants,belonging to 27 families and 72 genera,of which,21 species are of Asteraceae,and 81 species are herbal plants,accounting for 22.6% and 87.1% of the total,respectively. The analysis on their growth and dispersal status in the fields showed that 24 species were at high degree of threat to the local biodiversity,23 species at medium degree,and 46 species at low degree. Among the 93 species of alien invasive plants in Guangdong,76 species were from America,accounting for 81.7% of the total. The numbers and the kinds of the alien invasive plants that cause severe threat to local biodiversity in Guangdong had lesser differences with those in the adjacent districts Hong Kong,Xiamen,and Guangxi,probably because the diffusion among the plant species induced by adjacent geographical location. Some management strategies of the alien invasive plants were suggested.