摘要
利用收集的河南省新乡试验站田间试验数据对根系带水质量模型(Root Zone Water Quality Model,RZWQM)输入参数进行灵敏度分析和标定。结果表明,通过参数的灵敏度分析结果对RZWQM进行调参,节省参数校核时间,提高精度。参数标定后模拟值与实测值的对比显示,土壤含水量的模拟均方根差和平均相对误差分别为0.05 cm3/cm3和-6.15%;土壤硝态氮质量分数的模拟均方根差和平均相对误差分别为17.86 mg/kg和16.31%;冬小麦和夏玉米叶面积指数的模拟均方根差分别为7.31和1.01,冬小麦地上部生物量和产量的平均相对误差为34.79%和-8.77%,夏玉米产量的平均相对误差为7.13%。表明RZWQM能够较好地模拟和分析新乡冬小麦-夏玉米轮作体系中农田水、氮利用效率和作物产量,为利用RZWQM建立农田水肥优化管理措施奠定基础。
RZWQM was made sensitivity analysis and calibrated for simulating soil moisture,nitrate concentration and crop growth in a double-cropping system comprised of winter wheat（Triticum aestivum L.） and maize（Zea mays L.） at Xinxiang,Henan.The results showed that based on the sensitivity analysis of RZWQM for parameters,efficiency of model calibration can be significantly improved.Comparison of observed and simulated values,the root mean standard error（RMSE） and mean relative errors（MRE） of simulated soil water content in the 0~100 cm layer were 0.05 cm3/cm3 and-6.15% respectively.The RMSE and MRE of NO-3-N concentration in the 0~100 cm layer were 17.86 mg/kg and 16.31%,respectively.The RMSE of simulated leaf area index were 7.31 and 1.01,respectively.The MRE of biomass and grain yield of wheat were 34.79% and-8.77%,respectively.The MRE of maize yield was 7.31%.Above results indicate that RZWQM can be used as a tool to simulate and investigate the effects of soil water on crop yield in the wheat-maize cropping system in Xinxiang.The reasonable model parameters established for the cropping system are the basis of model application for optimizing managements and decisions in agriculture.
出处
《灌溉排水学报》
CSCD
北大核心
2011年第2期5-9,共5页
Journal of Irrigation and Drainage
基金
水利部公益性行业项目(200901083)
