| 河流边滩硝化反硝化潜力及其影响因素 |
| Nitrification and Denitrification Potential of a Point Bar and the Influencing Factors |
| 投稿时间：2022-11-04 修订日期：2023-03-21 |
| DOI：10.15928/j.1674-3075.202211040441 |
| 中文关键词:边滩 沉积物 硝化反硝化潜力 |
| 英文关键词:point bar sediment nitrification and denitrification potential |
| 基金项目:国家自然科学基金项目（52179131） |
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| 中文摘要: |
| 为探究河流边滩沉积物硝化反硝化潜力及与沉积物的理化性质关系，于2021年7月以夏家寺河边滩为研究对象，对比研究了顺直河道与边滩沉积物的硝化反硝化潜力，并分析了各环境因子对其硝化反硝化潜力的影响。结果表明：（1）边滩和顺直河道沉积物、、、、、含量最大值均出现在表层，且边滩沉积物各环境指标的平均值均大于顺直河道；（2）边滩沉积物硝化潜力（1.91±1.61）mg/（kg?d）大于顺直河道（0.70±1.01）mg/（kg?d）（P<0.05），在 15 d培养期内硝化潜力随时间的增加而呈上升趋势，且各层硝化潜力大小表现为表层＞中层＞底层（P<0.05），在10 d培养期内边滩沉积物硝化活性大于顺直河道；（3）边滩沉积物反硝化潜力（85.99±12.06）mg/（kg?d）大于顺直河道（38.93±30.46）mg/（kg?d）（P<0.05），边滩和顺直河道沉积物反硝化速率分别在培养1 d、3 d后达到最大值，反硝化活性分别在6 d、15 d达到最大值，10 d培养期内，顺直河道沉积物反硝化活性大于边滩；（4）河道沉积物硝化潜力与、、、、、含量呈显著正相关（P<0.05），反硝化潜力与、、、含量呈显著正相关（P<0.05）。研究结果可作为河流生态修复，特别是边滩治理时的参考依据。 |
| 英文摘要: |
| Geographical features play a key role in river nitrification and denitrification. In this study, a point bar in Xiajiasi River of Huangpi district, Wuhan City was investigated. The river flows into Sheshui River, a tributary of the Yangtze River, and we examined the nitrification and denitrification potential of the point bar. We then compared the nitrification and denitrification potential of point bar sediment with those of sediments in a segment of straight river channel and analyzed the effects of environmental factors on nitrification-denitrification potential. Three sampling sites were set in both the point bar and straight river channel. In July 2021, surface, middle and bottom sediments at each site were sampled for determination of environmental factors. Mixed sediments of the three layers were cultured for 15 days of nitrification and denitrification experiments, respectively. Results show that: (1) The maximum contents of clay, TOC, NH4+-N, NO2--N, NO3--N and TN in sediments of both the point bar and straight river channel were all in the surface layer, and the average value of each parameter was higher in point bar sediment than in straight river channel sediment. (2) The nitrification potential of the point bar sediment (1.91±1.61) mg/ (kg?d) was higher than that of the straight river channel (0.70±1.01) mg/ (kg?d)) (P < 0.05). The nitrification potential increased with time during the 15 d culture period, and the nitrification potential of each layer was in the order of surface layer > middle layer > bottom layer (P < 0.05). During the first 10 day, nitrification in point bar sediment was higher than in the straight river channel sediment. (3) The denitrification potential (85. 99±12. 06) mg/(Kg?d)) of point bar sediment was greater than that of the straight river channel sediment (38.93±30.46) mg/ (kg?d)) (P < 0.05). The denitrification rates of point bar and the straight channel sediments peaked on day 1 and 3, respectively, and denitrification peaked on day 6 and 15, respectively. During the 10 d culture period, the denitrification activity of the straight channel sediment was higher than that of the point bar sediment. (4) In this study, the nitrification potential of sediments was significantly correlated with ORP, clay content, TOC, NH4+-N, NO3--N and TN (P < 0.05) and the denitrification potential was significantly correlated with TOC, NH4+-N, NO3--N and TN (P < 0.05). The results provide a reference for the ecological restoration of rivers, especially for managing point bars. |
| 肖静文,刘瑛,冯晶红,罗俊雄,卢梓岩.2024.河流边滩硝化反硝化潜力及其影响因素[J].水生态学杂志,45(3):86-93. |
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