石佛寺人工湿地水体富营养化评价与分析

Evaluation and Analysis on the Eutrophication of Shifosi Constructed Wetland

采用灰色聚类法并选定DO,CODMn,BOD5,NH3-N,TN和TP为聚类指标,对石佛寺人工湿地水体富营养化进行综合评价。结果表明:石佛寺人工湿地水质状况较好,对供水无影响,可保证安全供水。建湿地后与建湿地前相比水体富营养化程度有所降低,但并不明显。汛期的水体富营养级别高于非汛期,这主要是因为汛期来水量大,所带入的营养物质多,加上农作物生长季节化肥、农药等的施用,使流域内大量的氮、磷等营养盐随地表径流汇入湿地内,提高了湿地内氮、磷等的含量。防止水体富营养化的主要措施为:及时收割水生植物,防止二次污染;控制流域内点源和面源污染。

The grey clustering method was used,and DO,CODMn,BOD5,NH3-N,TN and TP were selected as clustering indicators,the comprehensive evaluation on Shifosi Constructed Wetland eutrophication was carried out.The results show that the water quality status of Shifosi constructed wetland is good and has no effect on water supply,the safety of water quality can be ensured.The degree of the eutrophication after construction of wetland is lower than the that before construction of wetland,but the difference is not significant.The water eutrophication level in flood season is higher than that in non-flood season because the inflow rate is larger in flood season,more nutrients are brought into the wetland,and application of chemical fertilizer and pesticide in the crop growth season makes a large amount of N,P and other nutrients within basins move into the wetland along with the surface runoff,increasing the contents of N,P and other nutrients of the wetland.So harvesting the aquatic plants timely to prevent the secondary pollution and control of point source pollution and non-point source pollution should be regarded as the main measures to prevent eutrophication.