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新疆鼠尾草叶片净光合速率日变化特征研究
Study on the Diurnal Variation Characteristic of Net Photosynthesis Rate in Leaves of Salvia deserta Schang
【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Spass 13.0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13.09 mmol·m-2·s-1。午间14:00稍有下降,降至12.76 mmol·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CO2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。
【Abstract】 Objective:To identify the relationship between diurnal changes of photosynthetic rate and environmental factors of Salvia deserta Schang(Salvia,Labiatae/Lamiaceae).Methods:Photosynthetic characteristics were monitored using portable Li-6400XT photosynthesis system,and the data was processed by the Excel 2003 and Spass13.0.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 22.77and 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 CO2 concentration;r =-0.849).Ca was the major environmental factor influencing diumal changes of the Pn during the five environmental factors,PAR(photosynthetically available radiation)、Ta(air temperature)、RH(relative humidity)、Ca and Vpd(deficit of water air pressure);Gs was the major self-physical factor influencing diurnal 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.
【Key words】 Salvia deserta Schang; Net photosynthetic rate; Diurnal change; Environmental factors; Stomatal conductance;
- 【文献出处】 中国现代中药 ,Modern Chinese Medicine , 编辑部邮箱 ,2013年11期
- 【分类号】R284
- 【被引频次】5
- 【下载频次】105