摘要
植生滤带可有效减少农业面源磷污染,并且可以保持水土,被认为是削减农业面源污染最有效的管理措施,并广泛应用于农业面源污染的治理。降雨强度是决定植生滤带拦蓄沉积物和滞留养分的重要因素。本研究选择常见降雨强度范围,根据某中下游流域实际情况设计出模拟实验装置,确定不同降雨强度条件下植生滤带对农业面源污染防治的效果,为某中下游植生滤带的设计和建设提供借鉴依据。结果表明:降雨强度对TP的削减效率的影响主要是通过改变TP的载体即地表径流的流速来实现的,降雨强度越大,径流流速越大,从而导致TP在植生滤带中被吸附的时间和效率降低,导致TP削减效率减少。
Plant-growing filter belt can effectively reduce agricultural non-point source phosphorus pollution and maintain soil and water.It is considered as the most effective management measure to reduce agricultural non-point source pollution,and is widely used in the control of agricultural non-point source pollution.Rainfall intensity is an important factor determining the retention of sediments and nutrients by phytogenic filter belts.In this study,the range of common rainfall intensity was selected,and a simulation experiment device was designed according to the actual situation of a middle and lower reaches of the river basin to determine the effect of planting filter belt on agricultural non-point source pollution control under different rainfall intensity conditions,which could provide a reference for the design and construction of planting filter belt in a middle and lower reaches of the river.The results show that the effect of rainfall intensity on the reduction efficiency of TP is mainly achieved by changing the flow velocity of surface runoff,which is the carrier of TP.The greater the rainfall intensity,the greater the flow velocity,which results in the decrease of the time and efficiency of TP adsorption in the planting filter belt and the decrease of the reduction efficiency of TP.
作者
项俊寒
李贵仁
任千铎
XIANG Jun-han;LI Gui-ren;REN Qian-duo(Agricultural College of Hebei Agricultural University,Baoding 071001;North China Engineering Investigation Institute CO.LTD,Shijiazhuang 050021)
出处
《地下水》
2019年第6期55-57,共3页
Ground water
关键词
植生滤带
面源污染
削减效率
降雨强度
TP
planting filter belt
non-point source pollution
reduction efficiency
rainfall intensity
TP
