【摘要】 坡地径流冲刷物质是导致湖库型水源地淤积和富营养化的主要因素。本试验根据坡耕地农田径流的水质特点,配置水样,利用人工构建的生态沟渠,分析在不同流量、不同水体浓度条件下随径流迁移的SS、氮、磷等物质的去除特点与径流量的变化特性。试验结果显示,栽种植被的B沟渠对于SS和氮磷的去除以及径流量的减少量与无植被的对照沟渠C相比,均能发挥较好的去除作用。其中,B沟渠对SS、总氮、总磷的平均去除率分别达到30.43%、12.66%和27.40%,对径流量的平均削减率为16.4%;C沟渠对SS、总氮、总磷的平均去除率分别为2.80%、-2.17%和-0.17%,对径流量的平均削减率为10.8%。说明在不同流量条件下,种植植被的生态沟渠具有明显的拦截去除坡地冲刷物质、增大渗透量、减少径流输出的的效应。更多还原

【Abstract】 Water- erosion material from sloping land runoff is the main factor which leads to deposition and eutrophication in the lake and reservoir- type water source. Water samples can be made up according to the water quality characteristic of slope farming farmland runoff. It uses the artificial ecological drainage ditch and under the condition of different flow and different concentration,and studies removing characteristics of SS,nitrogen,phosphorus in the sloping land runoff and the variation characteristics of the flow. Test results show that the removal amount of SS,nitrogen,phosphorus and decrement of flow of artificial ecological drainage ditch B are better than those of non- vegetation drainage ditch C. The main results are as follows: SS,total nitrogen and total phosphorus average removal rate of the artificial ecological drainage ditch B can respectively reach 30. 43%,12. 66% and 27. 40%,the average reduction rate of flow is 16. 4%. Those of non- vegetation drainage ditch C is respectively 2. 80%,- 2. 17%,- 0. 17% and 10. 8%. According to the test results,for artificial ecological drainage ditch B,under different flow conditions,there are obvious effects of intercepting and removing the water- erosion material from sloping land runoff,increasing infiltration capacity and reducing runoff.更多还原