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中文摘要：
应用土壤-作物系统模型模拟分析了内蒙古阿拉善地区不同水肥管理模式（传统和改进）下的土壤水分动态、氮素淋失以及春玉米生长过程。结果表明,当前农民传统水肥管理的水分渗漏量和氮素淋失量非常大,分别达到了303mm和179kg N/hm^2,而改进处理的水分渗漏量和氮素淋失量约是传统处理的一半。两种管理模式的水分利用效率差别不大,而氮素利用效率差异较大,分别为25.3和32.5kg/（kg N）,改进模式要明显好于传统模式。
英文摘要：
Field experiment with traditional （T1） and improved （T2） water and nitrogen （N） management was conducted in Left Banner of the Alxa League in Inner Mongolia Autonomous Region. The WHCNS （ soil water heat carbon and nitrogen simulation） model was used to simulate the water movement, N transport and crop growth process. The validation results showed that the simulated water content and nitrate concentration in soil profile as well as leaf area index, dry matter weight, crop N uptake and grain yield were all in good agreement with the measured data. The simulated results indicated that water drainage and nitrate leaching for TI treatment were very large, which reached 303 mm and 179kgN/hm^2, respectively, while the amounts for the T2 treatment was only half of the traditional treatment. Water use efficiency for both treatments was about 2.1 kg/m^3 , and N use efficiencies for T1 and T2 were 25.3 and 32.5kg,/kg N, respectively. The T2 treatment was better than that of T1.
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