中文摘要：

土壤硝态氮的淋失是水环境污染的主要来源。以江苏省宜兴市梅林流域硝态氮的淋失为研究对象,运用Hydrus-1D模型模拟了2010-2011年田间水分与硝态氮的迁移过程。结果表明,结合野外实验观测数据,Hydrus-1D模型反映了土壤中水分与硝态氮的迁移过程,控制土壤中水分的向下运动以及土壤中硝态氮的浓度可以有效地减少硝态氮的淋失。采用的改良灌溉施肥方案既满足了农作物对氮素的生长需求同时减少了硝态氮淋失量。

英文摘要：

Soil nitrate nitrogen loss is the main source of water pollution.Soil nitrate nitrogen movement of Meilin basin,Yixing City in Jiangsu province was studied.Soil water movement and nitrate nitrogen movement were simulated by Hydrus1D model from 2010 to 2011.The results showed that combined with field observed data,the simulation data could reflect soil water movement and soil nitrate nitrogen movement.The movement of soil nitrate nitrogen were controlled by water movement and concentration gradient.The modified irrigation and fertilization management pattern did not only meet the demand of crop but also reduce nitrate nitrogen loss.