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Grazing Experiment for Sustainable Management of Grassland Ecosystem of Inner Mongolia Steppe:Experimental Design and the Effects of Stocking Rates on Grassland Production and Animal Liveweight Value Assessment of Typical Steppe Ecosystem in Yunwu Mountain National Nature Reserve Decomposition of mixed litter of four dominant species in an Inner Mongolia steppe Studies on the foraging function of Messor aciculants (F. Smith) on plant seeds in desert steppe ecosystem of Ningxia, China