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Gas Exchange Characteristics & CO2 Concentration Response of Elaeagnus Angustifolia Leaves in Extreme Arid Regions
Author(s): 
Pages: 62-67
Year: Issue:  6
Journal: Journal of Gansu Sciences

Keyword:  Photosynthetic rateStomatal conductanceCO2 concentrationPhoto-inhibitionElaeagnus angustifolia;
Abstract: 以额济纳的沙枣树为研究对象,用Li-6400便携式光合测定仪和便携式荧光仪于2013年6月测定了沙枣叶片净光合速率(Pn)的日变化及不同CO2浓度下(Ca)的光反应曲线,分析了沙枣的光合日变化特征及其净光合速率(Pn)、气孔导度(Gs)和环境因子相互之间的关系,结果表明:沙枣的光合日变化呈双峰曲线,与气孔导度(Gs)、蒸腾速率(Tr)的日变化几乎相同,说明光辐射(PAR)的增强引起了沙枣光合对策的改变,光合午休可在一定程度上补偿净光合速率的降低;在光响应曲线中,沙枣叶片的净光合速率随光照强度增强而增大.在达到光饱和点后净光合速率随光照强度增强基本保持不变,且净光合速率随CO2浓度(Ca)升高而表现出逐渐增大的趋势;在不同CO2浓度下(Ca),沙枣叶片的光饱和点和表观量子效率随CO2浓度(Ca)的升高而逐渐增大,光补偿点则随CO2浓度(Ca)的升高基本保持不变,维持在65 μmol/(m2·s)左右.
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