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基于博斯腾湖北岸芦苇叶片气体交换的观测数据,分析芦苇叶片气孔导度特征与环境因子之间的关系,并验证植物叶片气孔导度模型。结果表明,芦苇叶片气孔导度日变化呈现双峰曲线。芦苇叶片气孔导度的变化与环境因子之间关系密切,当光合有效辐射较低时,气孔导度随光合有效辐射的增加而增加,当光合有效辐射大于1 200μmol·m-2·s-1时,气孔导度呈现下降趋势;气孔导度在一定范围内随水汽压亏损的增加而增加,在水汽压亏损接近1.8kPa时,气孔导度达到最大值,之后气孔导度随水汽压亏损的增加而降低;当温度达到27.75℃时,气孔导度达到最大,此后随着温度的增加,气孔导度逐渐降低。对2类气孔导度模型进行验证与对比,结合实测数据,建立适用于博斯腾湖芦苇叶片气孔导度对环境因子响应模型。
Based on the observation data of gas exchange of reed leaves on the north bank of Bosten Lake, the relationship between the stomatal conductance of reed leaves and environmental factors was analyzed and the stomatal conductance model was verified. The results showed that the diurnal variation of stomatal conductance showed a bimodal curve. The stomatal conductance of Phragmites communis increased with the increase of photosynthetically active radiation when the photosynthetically active radiation was low. When photosynthetically active radiation was more than 1 200 μmol · m-2 · s-1 , Stomatal conductance showed a downward trend. Stomatal conductance increased with the increase of vapor pressure loss within a certain range. Stomatal conductance reached its maximum at a water vapor pressure loss close to 1.8 kPa, and stomatal conductance decreased with vapor pressure loss While the temperature reached 27.75 ℃, the stomatal conductance reached the maximum, then with the increase of temperature, stomatal conductance decreased gradually. The stomatal conductance models of two types of stomatal conductance were validated and compared. Based on the measured data, the model of stomatal conductance response to environmental factors was established.