东新开河岸边植被缓冲带对雨水径流中典型污染物截留效果试验

通过对东新开河岸边不同配置植被缓冲带径流中污染物迁移影响分析,研究其对两岸缓冲带典型污染物氮、磷的去除效果,优选缓冲带植物配置结构。结果表明:优化配置的植被缓冲带较原生植被缓冲带对氮、磷污染物的截留效果具有明显优势,针对氨氮和总氮有明显削减效果,几种修复样地综合来看,S3(紫花苜蓿)样地对NH₃-N、TN、TP的削减率分别在30%、30%、25%以上,较其他植被配置样地有很好的截留效果,且根系扎实,有较强的适应能力,种植成本较低;植物不同生长期对缓冲带氮、磷的截留效果不同,成熟期的植被缓冲带对TN、TP的削减率分别在30%和25%以上,较分蘖期对氮、磷的削减率提高了80%以上。

EXPERIMENTAL STUDY ON THE TYPICAL INTERCEPTION EFFECT OF THE ALLOWABLE BUFFER ZONE ON THE BANK OF DONGXINKAI RIVER IN RAINWATER RUNOFF

By analyzing the impact of pollutant migration in the runoff of the vegetation buffer zone on the bank of the Dongxinkai River, the removal effect of nitrogen and phosphorus on the typical pollutants in the buffer zone on both banks was studied, and the plant configuration structure of the buffer zone was optimized. The results showed that the optimally configured vegetation buffer zone had obvious advantages over the original vegetation buffer zone in the interception effect of nitrogen and phosphorus pollutants. For the two indicators of ammonia nitrogen and total nitrogen, it had a significant reduction effect. Alfalfa plots had a reduction rate of more than 30%, 30%, and 25% for ammonia nitrogen, total nitrogen, and total phosphorus respectively, higher than other vegetation configuration plots, and had a solid root system, and relatively stronger adaptability and lower planting cost; plants had different retention effects on nitrogen and phosphorus in the buffer zone in different growth periods. The reduction rate of vegetation buffer zone in mature stage to TN and TP was 30% and 25% respectively, which was higher than that in the tillering stage. The reduction rate of nitrogen and phosphorus the was increased by more than 80%.