规模化牛场废水灌溉对冬小麦土壤速效氮迁移的影响

Effects of Dairy Wastewater Irrigation on Migration of Soil Available Nitrogen

研究了牛场废水灌溉冬小麦土壤速效氮迁移特征。结果表明,冬小麦全生育期灌溉2次或3次牛场废水是较优灌溉模式,小麦收获后不会造成土壤硝态氮过量积累。在小麦生育期内,1m土壤剖面上含硝态氮量整体呈"哑铃"形,含铵态氮量随土壤深度增加逐渐降低;牛场废水灌溉下部土层含硝态氮量比正常施肥处理低,说明牛场废水灌溉土壤硝态氮淋溶下渗强度小;但因牛场废水中铵态氮质量浓度较高,牛场废水灌溉处理土壤含铵态氮量在1m土壤剖面高于正常施肥处理。

This essay studied migration of soil available nitrogen when irrigating winter wheat with the dairy farm wastewater.The results indicated that the two and three dairy wastewater irrigation in the winter wheat growing period were superior irrigation modes and wound not cause the accumulation of soil nitrate and ammonium nitrogen after the winter wheat harvest.In the winter wheat growing period,the soil nitrate nitrogen concentration was generally ＂dumbbell＂ shape and the soil ammonium nitrogen concentration decreased by soil depth increasing in the 1 m soil profile.Comparing irrigation treatments with dairy farm wastewater with the controlled treatment,the under layer soil nitrate nitrogen concentration was lower,which showed that the leaching and infiltration of soil nitrate nitrogen was low-intensity;Because of the high ammonium nitrogen concentration in the dairy wastewater,the soil ammonium nitrogen concentration of irrigation treatments with dairy farm wastewater was generally higher than that of the controlled treatment.