退耕还湿湿地对水质的净化效果研究

Study on the Purification Effect to Water Quality of Conversion From Cultivation Back to Wetland

以桂阳县柏树河退耕还湿试点项目区内的还湿湿地为研究对象,根据植物生物学特性和试点区水质状况,因地制宜,选择合适的植物进行了优化配置,以提升项目区生态净化功能、改善进入项目区的水质。结果表明:柏树河退耕还湿湿地对COD、TN、TP、NH+4-N、NO-3-N的降低率分别为61.3%、78.6%、57.1%、66.3%和48.1%;"黄菖蒲+花菖蒲+水生鸢尾+水生美人蕉+风车草+水葱种植区对COD、TP的去除效果最好,湘莲+茭白种植区对TN的去除效果最好"。故退耕还湿湿地可有效净化水质,减少农业面源污染。

Taking the wet and dry wetland in the pilot project of conversion from cultivation back to wetland of Baishu River in Guiyang County as the research object,according to the biological characteristics of plants and the water quality status of the experimental area,suitable plants were selected to optimize the distribution according to the local conditions.The results showed that the reduction rates of COD,TN,TP,NH4^＋-N and NO3^--N were 61.3%,78.6%,57.1%,,66.3% and 48.1% respectively.Yellow flag ＋ Japanese iris＋ Aquatic iris＋ Canna glauca＋Cyperusalternifolius＋ ScirpusTabernaemontani planting area had the best removal effect on COD and TP and Xianglian＋ Zizania planting area had the best removal effect on TN.Conversion from cultivation back to wetland can effectively purify water quality and reduce agricultural non-point pollution.