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Effects of grazing on leaf photosynthetic traits in Leymus chinensis under field and greenhouse experiments. PN, Net photosynthetic rate; gs, Stomatal conductance; Ci, Intercellular carbon dioxide concentration; E, Transpiration rate; and WUE, water use efficiency. Symbols: ∗∗P < 0.01; ∗P < 0.05; ns, P > 0.05.
