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中文摘要：
利用EPIC模型对不同麦玉轮作系统进行模拟,通过对其输出结果的分析,综合考虑产量、经济效益、干旱胁迫和氮肥生产率等因素,对不同麦玉轮作系统进行综合评价,从而比较不同麦玉轮作系统的优劣。结果表明：（1）在模拟研究期间,8种麦玉轮作系统的产量均呈波动性下降趋势,其平均值分别为4.61、4.40、4.16、4.48、4.28、4.29、4.714、.55 t/hm2。所有的麦玉轮作系统中,麦玉轮作系统＂春玉米→冬小麦＂的经济效益最好。（2）在模拟研究期间,麦玉轮作系统＂春玉米→冬小麦→冬小麦＂的冬小麦和春玉米所遭受的年均干旱胁迫日数最少（29.51d）。在干旱年份麦玉轮作系统中的冬小麦较春玉米更容易遭受干旱威胁。综合产量、经济效益、作物所遭受的干旱胁迫天数和麦玉轮作系统的氮肥生产率等因素,在长武地区适宜采用的麦玉轮作系统为春玉米→冬小麦。
英文摘要：
Simulation results of EPIC model were analysed after the simulation of different rotation sequences.Considering grain yield,economic benefit,water stress days and productivity rate of N fertilizer generally, different rotation sequences were assessed,then the advantage and disadvantage were compared.The results showed that：（1） The average grain yield of 8 rotation sequences was 4.61,4.40,4.16,4.48,4.28,4.29,4.71 and 4.55 t/hm^2 respectively and a downward trend appeared during the simulation period.Considering economic benefit,spring maize-winter wheat was the best rotation sequence.（2） Water stress days,suffered by spring maize and winter wheat,of R2（spring maize-winter wheat-winter wheat） was the least（29.51 days average） among 8 rotation sequences.Winter wheat was more susceptible to water stress than spring maize in the rotation system.The value of productivity efficiency of N fertilizer in R1（spring maize-winter wheat） was the greatest among all rotation sequences.Taking grain yield,economic benefit,water stress days and productivity rate of N fertilizer into account,the appropriate rotation sequence was R1（spring maize-winter wheat） on Changwu arid-plateau.
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