Organic carbon content in major grassland types in Alex, Inner Mongolia Habitat selection of sympatric blue sheep (Pseudois nayaur) and red deer (Cervus elaphus alxaicus) during rutting periods in the Helan Mountains, China Seasonal changes of leaf rna/dna ratio and rna/protein ratio of four species plants from the Alxa Desert Comparison of the Grassland-ecological Conceptions of Herdsmen among Three Banners in Alxa League,Inner Mongolia Autonomous Region Winter and spring habitat selection of Red deer (Cervus elaphus alxaicus) in the Helan Mountains, China