Vertical distribution of algae in semi-desert soil of Shapotou area,Ningxia Hui Autonomous Region Classification and Ordination of Fengshui Woods on Karst Hills of Guilin The drought risk zoning of winter wheat in North China Spatial pattern of forest communities and environmental interpretation in Mulun National Nature Reserve, karst cluster-peak depression region Pattern of Larix principis-rupprechtii Plantation and Its Environmental Interpretation in Dongling Mountain Ecological relationships among artificial vegetations during their restoration in Antaibao mining area Trend surface analysis on community structure of a grassland in Bailihuang, Yichang county DCA, CCA and DCCA Ordination Analysis of Salty Meadow Community in Hutubi, Xinjiang Species Diversity and Environmental Interpretation of Typical Vegetation Types in the Shennongjia Natural Reserve