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Global warming and CO 2 rise is expected to change the balance of C3 and C4 plants in grassland vegetation, but disturbance, including grazing, could also affect C3/C4 community structure. We used a six-year (2005–2010) grazing experiment to test the prediction that the relative abundance of C4 plants (P C4 ) in the semi-arid grassland of Inner Mongolia is related to growing-period...
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