水土保持学报2017，Vol.31Issue(2)：33-39,7.DOI:10.13870/j.cnki.stbcxb.2017.02.007
模拟降雨对工程建设区裸露坡地产流产沙及氮素流失的影响
Research on Runoff, Sediment and Nutrient Loss Characteristics on Bare Slopes in an Engineering Construction Area Under Artificially Simulated Rainfall
摘要
Abstract
In order to reveal the processes of soil erosion and the characteristics of nitrogen loss on bare slopes under different rainfall intensity,by using artificial rainfall simulation device,we simulated rainfall of three intensities (1,1.5,and 2 mm/min) and set two processing method (bare land,slope covered with yarn net) to find out the characteristics of surface runoff and nitrogen loss under different rainfall intensity.The results were as follows:(1) Runoff intensity,runoff sediment concentration,and soil erosion rate were positively correlated with rainfall intensity,while soil infiltration rate and rainfall intensity was negatively correlated.(2) Cumulative runoff and sediment yield in the bare ground showed a linear correlation,while in the yarn net covered treatment they showed a power function relation.(3) Nitrogen loss in surface runoff decreased with the duration of rainfall,the amount of nitrogen loss increased with the increase of rainfall intensity,nitrate-nitrogen loss accounted for a higher proportion of total nitrogen than ammonium-nitrogen.(4) Soil erosion and nitrogen loss could be effectively controlled by covering the slope with yarn net,runoff and nitrate nitrogen loss decreased by 60.21％ and 56.74％ under the 1mm/min rainfall intensity,respectively;the amount of total nitrogen and ammonium nitrogen loss could be reduced by more than 59％ under the 1 and 1.5 mm/min rainfall intensity;the amount of eroded sediment was decreased by more than 79％ under all three rainfall intensities.The results showed that the yarn net coverage could effectively control the amount of soil erosion and nitrogen loss on the care slope of in the engineering construction area,and this research can provide a reference for the prevention and control measures of soil and water loss in engineering construction areas.关键词
模拟降雨/纱网覆盖/工程裸露坡地/产流产沙/氮素流失Key words
artificially simulated rainfall/soil slope covered with yarn net/engineering bare slope/runoff and sediment yield/nitrogen loss分类
农业科技引用本文复制引用
顾儒馨,倪九派,刘月娇..模拟降雨对工程建设区裸露坡地产流产沙及氮素流失的影响[J].水土保持学报,2017,31(2):33-39,7.基金项目
国家水体污染控制与治理科技重大专项(2012ZX07104003) （2012ZX07104003）
