摘要
利用室内人工降雨系统和大型可变坡土槽,模拟了裸土坡地在不同雨强及初始土壤铵态氮含量下的产污过程,分析了径流中溶解态氨氮浓度在降雨过程中的动态变化规律。结果表明:径流中溶解态氨氮的浓度不仅受表层土壤铵态氮含量的影响,而且与降雨强度呈显著正相关。产流初期氨氮浓度比较高,随后急剧下降,最后变化过程趋于平缓。在物理机理研究的基础上提出了氨氮浓度计算模型。
By using artificial precipitation equipment and big soil box, it was conducted to monitor rainfall, runoff and water quality synchronously for the study of ammonia loss process of bare slope field in various rainfall intensities and initial soil ammonia content. The results show that dissolved ammonia concentration in runoff varies with the beginning ammonia content in the surface active layer and rainfall intensity. At the initial period of runoff, ammonia concentration is high, but later declines sharply; after that it varies slowly with rainfall intensity and surface runoff. Finally, based on the study on the physical mechanism, a mathematic model has been developed to estimate the process of ammonia concentration in solution.
出处
《黑龙江科技信息》
2009年第5期37-38,共2页
Heilongjiang Science and Technology Information
关键词
氨氮
非点源污染
人工降雨
数学模型
ammonia
non-point source pollution
artificial precipitation
mathematic model
