A Study on the Productivity of Secondary Shrub Thicket and Shrub-Grassland in Yixian County,Anhui Province Application of the equilibrium and non-equilibrium ecology to the dynamics of the steppe grazing system in Xilin River Basin, Inner Mongolia Research on the morphological interactions between Tamarix ramosissima thickets and Nebkhas under different sand supply conditions:a case study in Cele oasis-desert ecotone Studies on types and community characters of forest and thicket vegetations in Ziwu Mountain Study on relationship between species in plant communities of Tianlong Mountain Spatial heterogeneity in soil carbon and nitrogen resources, caused by Caragana microphylla,in the thicketization of semiarid grassland,Inner Mongolia A STUDY ON THE BIOMASS OF SECONDARY SHRUB THICKET AND SHRUB-GRASSLAND IN Yl COUNTY OF ANHUI PROVINCE