库滨带对面源污染物的净化效果试验研究

为进一步研究滨岸缓冲带对面源污染物的净化机制,建立了农田、乔草带、滨水植物带、湿生草本带4个代表性试验小区,重点分析了其对氮、磷营养元素的净化能力.结果表明,农田是湖泊、水库等水体的重要的非点源污染源;乔草混合带对总氮(TN)及总磷(TP)有良好的净化作用,去除率分别为35.2%和32.6%.挺水植物对TN的去除效果非常显著,其质量浓度削减率达到88.9%,但是对TP表现为释放状态;草本过滤带具有较好的TN、TP净化效果,污染物去除率分别为37.4%和49.8%.过滤带内植被条件和入流污染物浓度是造成过滤带对TN净化效果差异的重要因素.

Experimental Study of Purification Effect of Shoreland Buffer Strips on Non-point Contaminant

In order to research purification mechanism of shoreland buffer strips on non-point contaminants, four typical experimental zones were selected to carry out a study on the nitrogen and phosphorus absorption capacity of them, which were farmland, arbor grass zone, waterfront plant zone and wet herbaceous zone. The results showed that the farmland was a very important source of no-point pol-lution ; the arbor grass zone had good purification effect on nitrogen and phosphorus with removal rate of 35.2% and 32.6% respective-ly; aquatic plants showed significant absorption effect on nitrogen with the concentration reduction rate of 88.9% , but showed a release effect on phosphorus; the waterfront plant zone showed better removal effect on nitrogen and phosphorus with removal rate of 37.4% and 49.8% respectively. The main factors influencing purification effect of shoreland buffer strips on nitrogen and phosphorus were vegetation conditions and inflow pollutant concentration.