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重庆石灰岩地区十大功劳光合特性动态变化和对CO2的响应研究

Study on the Photosynthetic Dynamic and the Response to CO2 of Mahonia fortunei in the Limestone Zone in Chongqing

    摘要
  • 摘要: 运用开放式气体交换CI-310便携式光合作用测定系统,研究了重庆石灰岩地区适生灌木十大功劳(Maho-nia fortunei)光合特性的动态变化和对CO2的响应。结果表明:十大功劳的净光合速率和气孔导度的日变化为双峰曲线,蒸腾速率的日变化为单峰曲线,净光合速率出现了光合午休现象,主要由非气孔因素影响,水分利用效率的日变化呈“L”型。在季节变化中净光合速率、蒸腾速率和气孔导度都呈现双峰曲线,而水分利用效率呈现“W”型。气体交换的日动态和季节动态变化是与植物生存的气候环境相适应的,在石灰岩地区表现出低光合低蒸腾和高水分利用效率的节水特性。净光合速率随着CO2浓度的升高而表现出升高趋势,其CO2补偿点为90μmol·mol-1左右,羧化效率为0.0125,较低的羧化效率是十大功劳净光合速率较低的一个原因。

     

    Abstract: The photosynthetic characteristics of a shrub,Mahonia fortunei in the limestone area of Chongqing was studied by CI-310 portable photosynthesis system.The results showed as follows: The diurnal variation of Pn and Gs of M.fortunei was "twin-peaked" curves and appeared "photosynthetic depressed" in the noon that related to non-stomatal restriction factor.The diurnal variation of E was "singled-peaked" curve and that of WUE looked like an "L".The seasonal changes of Pn,E and Gs were all "twin-peaked" curves,but WUE appeared a "W" curve.In order to grow well in limestone area M.fortunei took a way of "low photosynthesis,low transpiration and high water use efficiency".The experiment of response of Pn to CO2 indicated that Pn increased with the rise of CO2 and CO2 compensation point was 90 μmol·mol-1 and CE was 0.0125,which caused that M.fortunei had slow grow speed.

     

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