CHARACTERISTICS OF SOIL CARBON AND NITROGEN OF FOUR PLANT COMMUNITY TYPES IN ERDOS, INNER MONGOLIA PLANT DIVERSITY IN QIANYANZHOU AFTER 20 YEARS OF SMALL WATERSHED TREATMENT RAPD analysis of Camellia rosthorniana populations in different communities in Jinyun Mountain Studies on multi-storied mixed forest types on beach land and its benefit Species Composition and Population Niche of Natural Forests in Zhouzhi Laoxiancheng Natural Reserve of Shaanxi Correlation analysis on the damage of Mikania micrantha to plant communities in Neilingdind Island of Guandong Province,China Soil fertility quality assessment under different vegetation restoration patterns Species composition and classification of natural vegetation in the abandoned lands of the hilly-gullied region of North Shaanxi Province The relationship between species distribution pattern and environment factors in grassland of the Yunwu Mountain Spatial distribution patterns of Quercus liaotungensis population in Lingkong