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为了准确模拟冬小麦-夏玉米种植制度下的农田土壤墒情,本研究改进通用陆面模型CLM3.0的参数化方案,包括灌溉措施及作物种植制度参数化的加入、土壤厚度及土壤层的剖分修改、作物水文及土壤水文过程的一些参数化修改、考虑作物的株高变化等,在海河平原的3个农业观测试验站(东北旺、栾城、洪门)验证改进后的模型的适用性。结果表明:改进后的CLM3.0模型在冬小麦和夏玉米种植制度下的农田具有较好的适用性,可以抓住各层土壤湿度的变化,与改进前的模型相比,其土壤墒情模拟精度明显提高,2m土体土壤湿度的均方根误差在东北旺、栾城和洪门试验站分别减少了45.2%、47.1%和51.5%。
In order to accurately simulate the soil moisture content of winter wheat-summer maize cropping system, this study improved the parameterization scheme of general land surface model CLM3.0, including the irrigation measures and the parameterization of crop planting system, soil thickness and soil layer subdivision Modified, crop hydrology and soil hydrological process parameters of several modifications, taking into account crop plant height changes in the Haihe River Plain 3 agricultural observation test station (Dongbeiwang, Luancheng, Hongmen) to verify the applicability of the improved model . The results showed that the improved CLM3.0 model has better applicability in farmland under the winter wheat and summer maize cropping systems and can catch the changes of soil moisture in each layer. Compared with the pre-modification model, the soil moisture simulation accuracy The root mean square error of soil moisture in 2m soil decreased by 45.2%, 47.1% and 51.5% respectively in Dongbeiwang, Luancheng and Hongmen test stations.