黄淮海地区冬小麦光合作用参数的取值范围

Range of Parameter Values in Photosynthesis Model of Winter Wheat in Huang-Huai-Hai Areas

叶片初始量子效率α和最大光合速率Pmax是作物模型中计算光合作用的两个关键的敏感参数。这两个参数的确定一直是作物模型研究的难点。本文利用Li-6400便携式光合作用测定仪在山东农业大学实验基地进行了为期7a的大量田间观测实验。在获取大量实验数据的基础上，拟合了光合作用的光响应曲线，并确定了冬小麦初始量子效率α和最大光合速率Pmax。则结果表明，这两个参数依冬小麦品种的不同而变化，即存在较大的不稳定性，但当把各品种7a的实验数据进行综合拟合时，变化范围则较稳定。在本研究中，α变化范围为0．053—0．107mol·mol^-1，Pmax的变化范围为10．1～49．2μmol·m^-2·s^-1。确定的初始光量子效率α和最大光合速率Pmax的取值范围，可为作物模型关键参数的确定提供参考。

In the crop growth simulation models, the Leaf Initial Quantum Yield （α） and the Maximum Net Photosynthetic Rate （Pmax） are two sensitive parameters in calculating the photosynthesis, which have always being the nodus in the research of the crop growth simulation models. Based on seven years field observations in the experiment base of Shandong Agricultural University, where the data were measured by Li-6400. The light response curves of photosynthesis were fitted and values of the two parameters of winter wheat were settled. The rsults showed that values of the α and Pmax, changed with the different varieties of the winter wheat, which indicated large instability, but when seven years experimental data of the total winter wheat variety were fitted, the results showed a relatively steady range of α and Pmax with 0. 053 -0. 107mol·mol^-1 and 10. 1 -49.2μmol · m^-2·s^-1 respectively. The range of the two key parameters for the crop growth simulation model in this study could provide references for the calibration and validation of the key parameters in crop growth simulation models.