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中文摘要：
选取亚高山树线复合群优势植物糙皮桦（Betula utilis）、高山杜鹃（Rhododendron asferochnoum）、牛头柳（Salix dissa）、糙野青茅（Deyeuxia scabrescens）和甘肃苔草（Carex kansuensis），对比其光响应曲线、CO2响应曲线以及光合速率与光合氮利用效率的关系。结果表明：糙皮桦的最大净光合速率、表观量子效率、暗呼吸速率、光补偿点、羧化效率均最大，甘肃苔草均最小；牛头柳的光呼吸速率、甘肃苔草CO2补偿点和糙野青茅的光饱和点最高。5种叶氮含量差异不显著。糙皮桦、高山杜鹃和牛头柳的比叶重显著大于糙野青茅和甘肃苔草。糙皮桦和糙野青茅的光合氮利用效率和光合速率较同类型植物高。
英文摘要：
The photosynthetic characteristics of five dominant plants in subalpine timberline compound community （ Betula utilis , Rhododendron as f erochnoum , Salix , Deyeuxia scabrescens and Carex kansuensis） were studied and compared with interspecies. The response of net photosynthesis rate （Pmax） to intercellular CO2 concentrations （Ci） and photon active radiation （PAR） was determined by LI-6400 photosynthesis system. The results showed that： Betula utilis has highest Pmax, AQY, Ra, LCP and CE. Carex kansuensis had highest Rp, Salix dissa highest Г and Deyeuxia scabrescens highest LSP. The difference of leaf nitrogen content （N ） is not significant. The difference of leaf mass per area （LMA） between Betula util, Rhododendron asferochnoum , Salix and Deyeuxia scabrescens , Carex kansuensis is significant . Betula utilis and Deyeuxia scabrescens had higher PNUE and Pmax than other types of plants.
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