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Effects of grazing on soil respiration (R s, μmol CO2 m−2 s−1) in an alpine meadow located at elevations of 4313 m (a, b), 4513 m (c, d), and 4693 m (e, f) on the Tibetan Plateau in 2010 (a, c, and e) and 2011 (b, d, and f), respectively. Error bars represent standard error (n = 4).
