基于SWAT的不同农田灌溉模式下农田地表径流氮素流失特征

Characteristics of Nitrogen Losses in Surface Runoff from Farmland in Different Irrigation Mode Based on SWAT Model

以天津市武清区为研究对象,利用SWAT(Soil and Water Assessment Tool)模型进行不同农田灌溉模式下农田地表径流氮素流失特征的模拟,验证了模型在该地区的适用性。模拟时制定了16种不同的灌溉情景,模拟结果表明在冬小麦生育期灌溉污水2次和3次的情况下,对应夏玉米生育期的抽雄水灌污水的情境下(W5M2、W6M2、W7M2和W8M2)的氮素含量均比灌清水(W5M1、W6M1、W7M1和W8M1)时较小。由此得出选择合适的污灌制度,将会减少研究河段出口断面氮素含量的结论。

Chosen the Wuqing area of Tianjin as the research target, took use of the SWAT model to simulate the characteristics of nitrogen losses in surface runoff from farmland in different irrigation mode, checked the applicability of the mode in this area. Made 16 different irrigation scenes for simulate, the result of the simulate indicates that if irrigate sewage two and three times in winter wheat growth stages, corresponding with the situations of irrigate sewage in tassel stage of the summer maize growing season（W5M2. W6M2. W7M2 and WdM2）, the content of the nitrogen is fewer than irrigate water（WSM1, W6M1, W7M1 and WdM1）. Get the conclusion that chooses the suitable sewage irrigation program would reduce the content of nitrogen in export section of the research river.