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利用自制的土槽装置,室内模拟入渗氮素在不同坡度河岸带表土层中的运移过程.通过观测取样点在不同坡度条件下渗流水体出流时间以及水体中TN,NH4+-N浓度,探讨不同坡度河岸带土壤水分运移特性以及坡度对入渗河岸带表土层氮素截留效果的影响.试验结果表明:河岸带坡度越小,入渗水流在表土层中的停留时间越长,河岸带表土层对氮素的截留效果越好,但土层深度不同,截留效果差别较大;坡度越大,河岸带表土层对氮素的截留效果越差,但土层深度不同,净化效果差别不大;坡度大小与NH4+-N,TN截留率之间存在极其显著的指数相关关系.
Using homemade soil trough device, the infiltration process of nitrogen infiltration in topsoil with different slopes was simulated indoor.Through observing the outflow time of seepage water and the concentrations of TN, NH4 + -N in water under different slope conditions, The effects of soil water transport on different bank slopes and the effect of slope on the nitrogen retention of topsoil in infiltration riparian zone were studied.The results showed that the smaller the riparian slope, the longer the infiltration flow in topsoil, The topsoil retained the better nitrogen, but the depth of soil was different and the interception effect was quite different. The larger the slope, the worse the interception effect of topsoil on nitrogen, but the depth of soil was different and the purification effect was different Not significant. There was an extremely significant exponential correlation between slope size and NH4 + -N and TN retention.