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通过开顶式气室(OTC),分析了OTC内主要气象因子(温度、光合有效辐射、水汽压差等)和大豆叶片气孔导度的变化特征.引进Javis气孔导度模型,进行参数本地化,同时根据O_3吸收通量模型,研究了大豆叶片气孔O_3吸收通量的变化,并计算了江苏省各市大豆气孔导度和O_3吸收通量的变化.结果表明:(1)利用修订后的Javis气孔导度模型对大豆叶片气孔导度的模拟效果较好,模型解释了实测气孔导度82%的变异性.(2)CK、100n L/L和150nL/L O_3浓度处理下大豆在整个O_3熏期的累积吸收通量分别为14.46mmol O_3/m~2、15.86mmol O_3/m~2和16.69mmol O_3/m~2.(3)江苏地区O_3浓度在大豆生长季期间呈现逐渐增加的趋势,其叶片平均气孔导度大小表现为前期>中期>后期的变化特点,在前期时段气孔O_3累积吸收通量最多.
The characteristics of main meteorological factors (temperature, photosynthetically active radiation, water vapor pressure difference, etc.) and stomatal conductance of soybean leaf were analyzed by OTC, and the stomatal conductance model of Javis was introduced to localize the parameters , And the changes of stomatal O_3 flux in soybean leaves were studied according to the model of O_3 flux. The changes of stomatal conductance and O_3 flux of soybean in Jiangsu Province were calculated. The results showed that: (1) Using the revised Javis Stomatal conductance model was more effective in simulating stomatal conductance of soybean leaves. The model explained 82% variability of stomatal conductance. (2) Under the conditions of CK, 100n L / L and 150nL / L O 3, Cumulative absorption flux of smoked phase were 14.46 mmol O 3 / m 2, 15.86 mmol O 3 / m 2 and 16.69 mmol O 3 / m 2, respectively. (3) The concentration of O 3 in Jiangsu showed a tendency of increasing gradually during the growth season , The average stomatal conductance of leaves showed the characteristics of early> mid-stage> late stage, and the cumulative uptake of stomatal O_3 was the most in the earlier period.