中文摘要：

目的：研究新疆鼠尾草叶片净光合速率日变化及与环境因子的关系。方法：利用LI-6400XT光合仪测定新疆鼠尾草叶片净光合速率，采用Excel 2003和Spass13．0进行数据整理及作图和进行相关分析。结果：新疆鼠尾草叶片净光合速率、蒸腾速率日变化均呈现“双峰”曲线，有明显的光合“午休”现象；净光合速率峰值分别出现在12：00和18：00，分别为22．77和20．28μmol CO2·m^-2·s^-1，第1峰值大于第2峰值；蒸腾速率的峰值分别出现在12：00和16：00，分别为13．02和13．09mmol·m^-2·s^-1，午间14：00稍有下降，降至12．76mmol·m^-2·s^-1；相关分析表明，新疆鼠尾草净光合速率与气孔导度呈极显著正相关（r=0．892），与蒸腾速率呈显著正相关（r=0．835），与田间CO：浓度呈显著负相关（r=-0．849）；在有效光照强度、气温、空气湿度、田间CO2浓度和蒸汽压差亏损5个环境因子中，田间CO2浓度是影响净光合速率日变化的主要环境因子；在蒸腾速率、气孔导度、胞间CO2浓度3个自身生理因子中，气孔导度是影响净光合速率日变化的主要自身生理因子；影响蒸腾作用的主要外在环境因素是有效光照强度，主要内在生理因素为气孔的自我调节因素。结论：通过研究新疆鼠尾草叶片净光合速率变化规律及与环境因子的关系，为其更好地开发利用奠定了生物学基础。

英文摘要：

Objective： To identify the relationship between diurnal changes mental factors of Salvia deserta Schang （ Salvia, Labiatae/Lamiaceae）. Methods： of photosynthetic rate and environ-Photosynthetic characteristics were monitored using portable Li-6400XT photosynthesis system, and the data was processed by the Excel 2003 and Spass 13.0. Results： The curves of diurnal variations in Pn（ net photosynthetic rate） and Tr（ transpiration rate） showed two peaks and an obvious midday depression. The Pn peaks were detected at 12 ： 00 and 18 ： 00, and reached to 22.77 and 20. 28 μmol CO2 ·m^-2·s^-1, respectively; the first peak was higher than the second. The Tr peaks were detected at 12：00 and 16： 00, and reached to 13.02 and 12. 86 mmol·m^-2·s^-1, respectively. Pn was significantly positively correlated with Gs （ stomatal conductance ; r = 0. 892）, Tr （ r = 0. 0. 835 ） and significantly negatively correlated with Ca（field CO2concentration; r = -0. 849）. Ca was the major environmental factor influencing diurnal changes of the urnal changes of the Pn during the three factors, Tr, Gs and Ci（intercellular CO2concentration）. PAR was the major environmental factor influencing diurnal changes of the Tr, Gs was the major self-physical factor. Conclusion： Provide the biological basis for further development and utilization of Salvia deserta Schang.