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CO2 FLUXES OF ARTIFICIAL GRASSLAND IN THE SOURCE REGION OF THE THREE RIVERS ON THE QINGHAI-TIBETAN PLATEAU, CHINA NODULE CHARACTERISTICS OF THREE-YEAR-OLD CARAGANA MICROPHYLLA AND THEIR RESPONSES TO ENVIRONMENTAL CHANGES IN AN INNER MONGOLIA GRASSLAND Effects of grazing on the δ15N values of foliage and soil in a typical steppe ecosystem in Inner Mongolia, China