【摘要】 为了摸清连续降雨对缓冲带去除农田径流污染物效果的影响,通过现场人工降雨试验,研究了2次连续降雨条件下草皮缓冲带对氮、磷、悬浮物等径流污染物的净化效果,结果表明:草皮缓冲带对径流污染物具有良好的去除效果,且前端降解速度较快,后端逐渐趋缓,总氮、氨氮的去除和悬浮物的去除呈现正相关性。2次连续降雨条件下悬浮物浓度表现出明显的下降趋势,但第2次降雨悬浮物浓度下降趋缓,下降速率较第1次低,同时悬浮物末端去除率70%要低于第1次的85%。百慕大草皮缓冲带对渗流途径总氮、总磷具有一定的净化效果,多次连续降雨对渗流途径污染物去除效果影响较小,前后2次连续降雨总氮、总磷浓度变化趋势基本一致。更多还原

【Abstract】 To find out the effects of continuous rainfall on the removal efficiency of buffer to runoff pollutants,through fields man-made rainfall experiment,the removal effects of runoff pollutants(such as N/P) in riparian buffer on condition of 2 time continuous rainfall were studied.The results showed that grass buffer has a good removal efficiency on runoff pollutants,which decrease fast at the first half,and gradually slowing back.The removal of TN,Ammonia and SS showed positive correlation.On condition of 2 continuous rainfall,the concentration of SS showed the same downward trend,but the drop rate is lower than the 1st time,and the 2nd SS removal efficiency(70%) is lower than the 1st one(85%).Bermuda grass buffer has obvious removal effect on the TN,TP in seepage water,several continuous rainfall has less affecttion on seepage pollutant removal,and the concentration of TN,TP showed the same trend in 2 time rainfall.更多还原