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Symbiotic nitrogen (N) fixation by legumes was investigated using the 15N dilution technique in two Chinese grasslands: one in the north-eastern Tibetan Plateau and the other in Inner Mongolia in China. A small amount (0.03 g N m−2) of 15N labelled (NH4)2SO4 fertilizer was evenly distributed in two soils. One month after the 15N addition, four legumes(More)
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