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华北地区冬小麦光合作用的光响应曲线的特征参数
CHARACTERISTIC PARAMETERS OF LIGHT RESPONSE CURVES OF PHOTOSYNTHESIS OF WINTER WHEAT IN NORTH CHINA
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摘要: 在冬小麦各生育期测定了田间叶片光合作用速率及其相应的气象要素, 拟合了各生育期的光合作用的光响应曲线.得出它们的几个特征参数:初始量子效率、最大光合速率和凸度.在华北地区冬小麦的整个生育期, 初始量子效率大多在0.050~0.075之间变化, 最大光合速率在5~25 μmol·m-2·s-1之间变化.表明初始量子效率随生育期的变化不大, 最大光合速率在营养生长期较高, 为20~25 μmol·m-2·s-1, 在生殖生长期, 随着叶片氮、磷、钾等营养元素含量的下降, 叶片的最大光合速率显著降低.Abstract: The photosynthesis rate of leaves in field and their corresponding meteorological elements are observed in each growing season of winter wheat in North China. The light response curves are fitted for each development duration, and characteristic parameters are obtained such as initial quantum efficiency, maximum photosynthesis rate and convexity. In the entire growth season of winter wheat in North China, the initial quantum efficiency varies between 0.05 and 0.075, the maximum photosynthesis rate varies between 5 and 25 μmol·m-2·s-1. It is shown that the initial quantum efficiency of each development duration does not vary much and the maximum photosynthesis rate ranges from 20 to 25 μmol·m-2·s-1 before heading duration, and decreases greatly in reproductive growth duration, with the decreasing of nitrogen, phosphorus and potassium of leaves.
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