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本文利用禹城试验站田间试验数据对根系层水质模型的输入参数进行了灵敏度分析和标定。参数标定后的模拟结果与实测结果的对比显示:土壤体积含水量模拟值的均方根差和平均相对误差分别为0.069cm3·cm-3和-8.57%;土壤硝态氮含量模拟值的均方根差和平均相对误差分别为41.41mg/kg和-69.56%;在冬小麦-夏玉米轮作体系下,作物吸氮量模拟值的均方根差和平均相对误差分别为97.8kg/hm2和50.6%;作物地上部生物量和产量模拟值的均方根差分别为2392kg/hm2和2239kg/hm2,平均相对误差分别为32.8%和22.2%;叶面积指数模拟值的均方根差和平均相对误差分别为2.83和243.8%。模拟结果表明:RZWQM能够较好地模拟冬小麦-夏玉米轮作体系中土壤水动态和作物地上部生物量及产量,可用于模拟分析农田水氮利用效率。但该模型在禹城试验站对土壤硝态氮含量和叶面积指数模拟精度欠佳的原因有待进一步分析。
In this paper, the field test data of Yucheng experimental station was used to analyze and calibrate the input parameters of root layer water quality model. The comparison between the simulated results and the measured results shows that the root mean square error and average relative error of soil water content are 0.069cm3 · cm-3 and -8.57%, respectively. The simulated values of soil nitrate nitrogen content The root mean square error and average relative error were 41.41 mg / kg and -69.56%, respectively. Under the winter wheat-summer maize rotation system, the root mean square error and average relative error of crop nitrogen uptake were 97.8 kg / hm2 and 50.6 %, And the root mean square error (RMSE) of above-ground biomass and yield simulated values were 2392kg / hm2 and 2239kg / hm2, respectively. The average relative errors were 32.8% and 22.2% respectively. The errors are 2.83 and 243.8% respectively. The simulation results show that RZWQM can simulate soil water dynamics and aboveground biomass and yield in winter wheat-summer maize rotation system well and can be used to simulate and analyze water and nitrogen use efficiency in farmlands. However, the reason why the model is not good enough to simulate nitrate nitrogen content and leaf area index at Yucheng test station needs to be further analyzed.