农业区氨氮流失模型

A mathematical model of ammonium nitrogen loss from farmland

定量分析了农田降水、产流、下渗、排水、蒸散发、灌溉之间的关系并提出相应的数学方程式．采用Ｌａｎｇｍｕｉｒ等温线动态描述土壤中氯氮吸附与溶解两相平衡状态。在此基础上，建立了一个模拟随农业排水和产沙的氨氮流失数学模型，并以江苏省锡澄农业区为例说明了这一模型的应用。

The relations among precipitation, runoff, infiltration, drainage, evaporation and irrigation were analyzed and corresponding mathematical equations were proposed. The Langmuir isothermohyps were used to describe the balance relationship between absorption and dissolution of ammonium nitrogen in soil. On the basis, a mathematical model was established to simulate ammonium nitrogen loss from farmland and it was demonstrated by an example of Xicheng Region in Jiangsu Province.