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Warming and Nitrogen (N) deposition are key global changes that may affect eco-physiological process of territorial plants. In this paper, we examined the effects of warming, N deposition, and their combination effect on the physiological performances of  Leymus secalinus . Four treatments were established in an alpine meadow of Qinghai-Tibetan plateau: control (CK), warming (W), N deposition (N), and warming plus N deposition (NW). Warming significantly decreased the photosynthetic rate ( A net  ), stomatal conductance ( g s  ), intercellular CO 2  concentration ( C i  ), and transpiration rate ( T r  ), while N deposition and warming plus N deposition significantly increased those parameters of  L. secalinus . Warming significantly increased the  VPD  and  L s  , while N deposition and warming plus N deposition had a significant positive effect. Warming negatively reduced the leaf N content, Chla, Chlb, and total Chl content, while N deposition significantly promoted these traits. Warming, N deposition, and their combination significantly increased the activity of SOD, POD, and CAT. Besides, warming and warming plus N deposition significantly increased the MDA content, while N deposition significantly decreased the MDA content. N deposition and warming plus N deposition significantly increased the Rubisco activity, while warming showed no significant effect on Rubisco activity. N deposition and warming plus N deposition significantly increased the  Fv / Fm , ΦPSII,  qP , and decreased NPQ, while warming significantly decreased the  Fv / Fm , ΦPSII,  qP , and increased NPQ. N deposition strengthened the relations between  g s  , Chl, Chla, Chlb, Rubisco activity, and  A net  . Under warming, only  g s   showed a significantly positive relation with  A net  . Our findings suggested that warming could impair the photosynthetic potential of  L. secalinus  enhanced by N deposition. Additionally, the combination of warming and N deposition still tend to lead positive effects on  L. secalinus .

Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau