Selection of pioneer species is one of the key factors for the restoration of ecosystem in desertification areas. According to the site conditions of the test area, 5 drought-resisting tree species were selected for the experimental research as pioneer species. And through the programs such as seedling-raising, planting and forest management, the data form 5 years' continuous surveying on the tree height, chest-diameter, crown and survival percentage of the 5 species were collected and analyzed. Their influence on the environmental factors was...