坑塘湿地对生源要素氮的净化效果

为研究坑塘湿地对氮的净化效果,依据降雨状况,对太湖入湖小流域河网区一小型坑塘进行了3次降雨径流后生源要素氮的净化效果试验研究.结果表明,3个试验期内塘中TN的净化效率分别为54.0%,51.4%和23.8%,NH4 -N的净化效率分别为85.8%,67.0%和52.6%,说明坑塘湿地系统能显著降低流域进入临近地表水体中的氮源负荷.该塘在3次降雨过程中对径流进入的总氮截留量分别达到788.9 g,2 432.7 g,416.2 g,表明试验塘对湖泊水体的富营养化缓解发挥了明显的作用.

Purification effects of nitrogen nutrients in natural pond

Experimental study was performed to study the purification effects of nitrogen nutrients in a small natural pond in a sub-basin of the Taihu Lake after three times of precipitation.The results showed that the purification efficiencies of total nitrogen(TN) in three experimental periods were 54.0%,51.4% and 23.8%,respectively,while the values were 85.8%,67.0%,and 52.6%, respectively for ammonia(NH~ _4-N).It is demonstrated that the small natural pond can purify the nitrogen nutrient pollution and remarkably reduce its concentration in adjoining surface water.It was also obtained that the amounts of TN intercepted by the small pond from the runoff during the three experimental periods were 788.9?g,2?432.7?g,and 416.2?g,respectively,demonstrating that the eutrophication of water body was obviously alleviated.