Investigation of Exotic Plants in Wolong National Nature Reserve

In this paper,a survey was made on the exotic plants of Wolong National Natural Reserve. It was found that there were 224 exotic species in Wolong,belonging to 86 families and 173 genera,occupying about 10 percent of the total higher plants known in Wolong. After screening,it was found that there were 16 kinds of invasive alien plants,involving 11 families and 16 genera,including 5 spevies from Compositae,2 species from Leguminosae,1 species from Gramineae,1 species from Convolvulaceae,1 species from Amaranthaceae,1 species from Onagraceae,1 species from Moraceae,1 species from Solanaceae,1 species from Nyctaginaceae, 1 species from Boraginaceae and 1 species from Pontederiaceae. Analysis of the survey has shown that Galinsoga parviflora and Conyz canadensis of the Compositae,Trifolium repens of the Leguminosae,comfrey of the Boraginaceae,and ryegrass of the Gramineae are widely distributed in the survey area. They are harmful. High attention should be paid to them. Besides,according to the actual condition of the reserve,some relevant prevention and control measures are puts formard in this paper.