Atrazine, an herbicide to kill broadleaf weeds affecting many different types of crops such as corn, sorghum, and sugarcane, is extensively used in agricultural production around the world in recent years. The worldwide use of atrazine did not only significantly increase crop yields but also result in serious aboveground-and belowground water pollutions. Grass filter strips, planted along streams, ponds, and lakes, were designed to remove sediments, organic materials, nutrients, and chemicals carried in runoff or waste water, and which were regarded as one of the best management practices in the controlling of agricultural non-point source pollution in many countries. However, the efficiency of grass filter strips in the removing of atrazine has not been adequately tested, especially on the Northern China. This study was conducted to evaluate the effects of herbaceous grass filter strips established by Pennisetum (Pennisetum alopecuroides (Linn.) Spreng and Arundinella (Arundinella hirta (Thunb.) C. Tanaka) on the removing of runoff, sediment, and atrazine in a simulated experiment on the soil boxes with runoff generator (water flow rate and speed were 0.22 L/s and 1.3 m/s, respectively). Three treatments, including T1 (inflow sediment content=20 g/L, inflow atrazine concentration=0.3 mg/L), T2 (inflow sediment content=40 g/L, inflow atrazine concentration=0.6 mg/L), and T3 (inflow sediment content=60 g/L, inflow atrazine concentration=0.9 mg/L), were set and each of them had three replications in this study. The differences between the inflow and outflow of runoff, sediment, and atrazine through the grass filter strips were examined to determine the efficiency of the grass filter strips in the decreasing of studied pollutants. The results showed that the grass filter strips significantly reduced runoff by up to 88%. The grass filter strips was also very efficient in reducing sediment and atrazine, but their effects were significantly influenced by sediment content and atrazine concentration in the inflow water through the grass filter strips. The outflow sediment was decreased by 95%, 93%, and 85%by the grass filter strips when the inflow sediment content was 20, 40 and 60 g/L, respectively. Similarly, the outflow atrazine was decreased by 95%, 92%, and 81%by the grass filter strips when the inflow atrazine concentration was 0.3, 0.6 and 0.9 mg/L, respectively. Additionally, the decreasing percentage of the sediment and atrazine was gradually decreased with the increasing time. The sediment was decreased by 97%, 95%, 93%, 91%, and 87% at the 1st, 10th, 20th, 40th, and 60th min, respectively; while the atrazine was decreased by 97%, 93%, 90%, 86%, and 84%at the 1st, 10th, 20th, 40th, and 60th min, respectively. At last, the result of the correlation analysis showed that the outflow concentration of atrazine was significantly correlated with the volume of outflow water (r1=0.88, r2=0.93, r3=0.94), which indicated that the outflow atrazine was mainly determined by the volume of outflow water. From these results we concluded that the herbaceous grass filter strips were very efficient in reducing the sediment and atrazine. This conclusion may be helpful for preventing atrazine and other agricultural non-point source pollution in the Northern China.% 除草剂阿特拉津的大量使用在提高农业生产效率、增加作物产量的同时，也导致了严重的环境污染。该研究通过在土槽上进行浑水冲刷试验，定量研究了禾本科草本植被过滤带（狼尾草Pennisetum alopecuroides (Linn.) Spreng和野古草Arundinella hirta (Thunb.) C. Tanaka）对径流、泥沙、以及阿特拉津的拦截效果。结果表明，禾本科草本植被过滤带能有效拦截径流，拦截率可达88%；并显著降低泥沙和阿特拉津流失量，但其作用效果受泥沙和阿特拉津的进水浓度影响较大。当进水泥沙浓度为20、40、60 g/L时，植被过滤带对泥沙的拦截率分别为95%、93%、85%；当进水阿特拉津浓度为0.3、0.6、0.9 mg/L时，植被过滤带对阿特拉津的拦截率分别为95%、92%、91%。另外，植被过滤带对泥沙和阿特拉津的拦截率随时间延长呈逐渐降低趋势，试验开始后第1、10、20、40、60分钟的泥沙拦截率分别为97%、95%、93%、91%、87%，阿特拉津拦截率分别为97%、93%、90%、86%、84%；同时，阿特拉津出流浓度与径流量有显著相关关系（r1=0.88，r2=0.93，r3=0.94），表明径流量在一定程度上决定了阿特拉津出流浓度和出流量。研究证实，植被过滤带能有效降低阿特拉津随径流流失量，对阿特拉津引起的农业面源污染具有较好防治效果。
展开▼
