Surface roughness characteristics of biological soil crusts and its influencing factors in the hilly Loess Plateau region, China Nitrogen fixation potential of biological soil crusts in Heidaigou open coal mine, Inner Mongolia, China. Composition and Ecological Distribution of the Algae Living in the Gurbantonggut Desert of Xinjiang EFFECTS OF BIOLOGICAL CRUSTS ON THE GERMINATION OF FIVE DESERT VASCULAR PLANTS WITH DIFFERENT SEED MORPHOLOGIES Effects of biological crusts on dew deposition and evaporation in the Southern Edge of the Mu Us Sandy Land, Northern China