城乡交错带典型溪流沟渠沉积物氮污染特征及硝化-反硝化潜力

发布时间：2019-03-07 21:45

【摘要】：2015年5月~2016年7月,在合肥市城乡交错带3条溪流沟渠上,按季节采集表层沉积物样,分析沉积物的氮素污染特征,解析潜在硝化速率PNR、表面硝化速率ANR及反硝化速率的时空变化性,并以偏最小二乘回归分析法进行影响因子分析.结果表明:1关镇河支渠氮素污染最为严重,TN均值达4 516.39 mg·kg-1,分别为磨店小溪流和陶冲小溪流的2.56、1.36倍,NH_4~+-N和NO_3~--N含量也表现为关镇河支渠最高,磨店小溪流最低;2 3条溪流沟渠PNR和ANR几乎都表现为夏季最高,冬季最低,春、秋两季则大体相当,高低排序为陶冲小溪流磨店小溪流关镇河支渠;3关镇河支渠反硝化速率均值为10.59 mg·(kg·h)-1,分别为磨店小溪流和陶冲小溪流的3.16、1.75倍,3条溪流沟渠的反硝化速率和反硝化活性都表现为夏季高于春季;4根据参数FVIP,各溪流沟渠ANR、PNR和反硝化速率几乎都与沉积物的pH、OM、NH_4~+-N、NO_3~--N、TN、TP存在较为显著的相关关系,但不同溪流水体之间存在差异性.
[Abstract]:From May 2015 to July 2016, surface sediment samples were collected from three stream ditches in the urban-rural interlaced zone of Hefei City to analyze the characteristics of nitrogen pollution and analyze the potential nitrification rate (PNR,). The temporal and spatial variability of surface nitrification rate (ANR) and denitrification rate were analyzed by partial least squares regression analysis. The results showed that: (1) the nitrogen pollution was the most serious in the branch channel of Guanzhen River, and the mean value of TN was 4 516.39 mg kg-1, which was 2.56 and 1.36 times higher than that of Maodian small stream and Tao Chong small stream, respectively. The contents of NH_4~-N and NO_3~--N also showed the highest in Guanzhen River branch channel and the lowest in Mudan Xiaoxi. The PNR and ANR of the three stream ditches were almost the highest in summer, the lowest in winter, and about the same in spring and autumn, and the order of high and low was the branch channel of Guanzhen River, a small stream of Tuochong Creek and Moudian. (3) the average denitrification rate of Guanzhen River branch channel was 10.59 mg (kg 路h)-1, which was 3.16,1.75 times of that of Meridian and Tao Chong streams, respectively, and the denitrification rate of Guanzhen River branch was 10.59 mol 路h ~ (- 1). The denitrification rate and denitrification activity of the three stream canals were higher in summer than in spring. 4According to the parameter FVIP, the ANR,PNR and denitrification rate of each stream channel were almost all correlated with the pH,OM,NH_4~-N, N-N, TP of sediment, but there were differences among different stream water bodies.
【作者单位】：合肥工业大学资源与环境工程学院;安徽新华学院土木与环境工程学院;合肥工业大学土木与水利工程学院;
【基金】：国家自然科学基金项目(51579061,51179042)
【分类号】：X52

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