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草地学报  2015 

4种芒属植物光合特性研究

DOI: 10.11733/j.issn.1007-0435.2015.04.013, PP. 752-757

Keywords: 芒属植物,光响应,净光合速率,水分利用率

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Abstract:

以芒(Miscanthussinensis)、五节芒(M.floridulus)、荻(M.sacchariflorus)和南荻(M.lutarioriparius)等4种典型芒属植物为试验材料,用LI-6400便携式光合仪测量不同时期的光合特性,来研究芒属植物光响应及光合特性的季节性变化规律。结果表明光合作用参数对不同光合有效辐射的响应在种间有差异,除南荻的光饱和点(LSP)在800μmol·m-2·s-1左右外,其他3种约在1000μmol·m-2·s-1;最大净光合速率(Pnmax)由大到小依次为荻(47.3μmol·m-2·s-1)、南荻(38.6μmol·m-2·s-1)、五节芒(20.4μmol·m-2·s-1)、芒(8.0μmol·m-2·s-1);表观量子效率(AQY)依次为荻(0.123)、南荻(0.108)、五节芒(0.089)、芒(0.022),荻和南荻的光能转化率强于五节芒和芒。主生长季的净光合速率(Pn)表现出明显的季节性变化,并与生长速率同步,种间差异极显著(P<0.01),荻和南荻的Pn值高于芒和五节芒。4种芒属植物在主生长季的水分利用率(WUE)最小值在6-7月,最大值在8-9月,表现出耐旱耐高温能力,且种间差异显著(P<0.05)。

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