不同连通类型对会仙湿地水质影响分析及评价

Analysis and Evaluation of the Effect of Different Connection Types on Water Quality of Huixian Wetland

为了解不同连通类型对湿地水环境的影响,以桂林市会仙的河滨湿地、河道相连水塘湿地、孤立水塘湿地为研究对象,采用单因子评价法、综合污染指数法、对数型幂函数普适指数公式评价湿地水体及富营养化状态。结果表明:①会仙湿地氨氮、硝氮、总氮、总磷、化学需氧量浓度分别在0.07~1.22、0.01~1.24、0.45~3.95、0.04~0.29、6.19~120.28 mg/L,河滨湿地氨氮和总氮平均浓度高于其余湿地,河道相连水塘湿地硝氮最高,孤立水塘湿地化学需氧量浓度最高且总磷浓度波动最大;②会仙不同连通类型湿地水质均属劣Ⅴ类,主要超标水质因子为总氮和化学需氧量,且均处于富营养化状态。本研究能为会仙不同类型湿地水环境治理与修复提供科学依据。

In order to figure out the effect of different connection types on the water environment of wetlands,the riverside wetland,river-connected pond wetland,and isolated pond wetland in Huixian town,Guilin city,were taken as the research objects.The single factor evaluation method,comprehensive pollution index method,and universal exponential formulas for logarithmic power functions were used to evaluate water quality and eutrophication of the wetlands.The results showed that:①the concentrations of ammonia nitrogen(NH+4-N),nitrate nitrogen(NO 3-N),total nitrogen(TN),total phosphorus(TP),and chemical oxygen demand(COD Cr)in Huixian wetland were 0.07~1.22、0.01~1.24、0.45~3.95、0.04~0.29、6.19~120.28 mg/L,respectively.The average concentration of NH+4-N and TN in the riverside wetland was higher than that of the other wetlands,while the concentration of NO 3-N in the river-connected pond wetland was the highest.Moreover,the concentration of COD Cr in the isolated pond wetland was the highest,and its TP concentration had the most significant fluctuation;②The water quality in Huixian wetland with different connection types was defined as inferior class V,with TN and COD Cr as the major water quality factors exceeding the standard,and the wetlands all were in eutrophication.This study can provide a scientific basis for water environment governance and restoration of different wetlands in Huixian.