中文摘要：

应用农田水氮管理模型（water and nitrogen management model，WNMM）模拟潮土水氮运移过程，以建立针对该地区气候环境和土壤性质的田间水氮优化管理方案。利用田间试验对WNMM模拟结果进行了校验，结果表明该模型能较好地模拟潮土地区的土壤水氮运移过程，农田蒸散量、土壤含水量和硝态氮含量的模拟值与实测值在α／=0．01水平上相关显著，误差范围也令人满意。根据土壤实时水氮含量数据，建立了按作物生长亏缺动态调整灌溉、施氮的优化农田水氮管理方案。在多年平均气象条件下，与传统管理模式相比，优化管理模式不仅能为作物生长提供更好的土壤水肥条件，而且每年可节约灌溉水163．5mm、氮肥130kg·hm^-2，减少土壤水渗漏264．6mm、氮素淋失71．1kg·hm^-2。

英文摘要：

A water and nitrogen management model （WNMM） was used to simulate the soil water and nitrogen dynamics in fluvo-aquic soil, with a view to establishing a scheme to optimize soil water and nitrogen in light of local climate and soil properties. The model was validated by field experiments in fluvo-aquie soil. Results show that the model did good in simulating water and nitrogen dynamic. The simulated values of evaportranspiration, soil water and nitrate content displayed significant correlation （α = 0.01 ） with measured values, and the deviation are acceptable. Based on real-time data of soil water and nitrogen content, an optimal irrigation and fertilization scheme was figured out. Under the average climate conditions of years, the scheme could not only provide a preferable soil environment for crop growth, but also save irrigation water by 163.5 mm and nitrogen fertilizer by 130 kg . hm^-2 and decrease soil water and nitrogen leaching by 264.6 mm and 71.1 kg . hm^-2 , respectively, each year.