【摘要】 通过田间定位监测和分析,研究了稻麦轮作下降雨径流过程农田NH4+-N流失的影响因素和流失特征。结果表明,稻季施肥和灌溉对降雨径流中NH4+-N流失有一定影响,麦季小麦越冬期是地表NH44+-N径流流失主要发生时期,占NH4+-N总流失量85%以上,是农田主要的污染源。根据其流失规律和特征,运用随机模型和GLEAMS模型,对稻麦NH4+-N流失进行模拟研究,其模拟值与试验值拟合度较高,NH4+-N流失估算值与实测值误差为6.17%和2.04%。更多还原

【Abstract】 The influencing factors and characteristics of NH+4-N loss of rice-wheat rotation soil during rainfall runoff were studied by field location monitoring and analysis.The results showed that the fertilization and irrigation had a certain impact on the NH+4-N loss in rice season.The overwintering period of wheat was the major one of the NH+4N loss occurrence,in which the loss accounted for above 85% of the total NH+4-N loss and was a main pollution source of farmland.According to the loss characteristics,stochastic and GLEAMS models were used to simulate the NH+4-N loss in rice and wheat seasons.The degree of fitting was comparatively high between the measured and simulated values(R=0.89 and 0.99),and the error between them was 6.17% and 2.04%.更多还原