| 刘亚贺,王晓燕,许康丽.环境因子对密云水库消落带沉积物-水界面氮交换通量的影响研究[J].农业环境科学学报,2022,41(4):849-856. |
| 环境因子对密云水库消落带沉积物-水界面氮交换通量的影响研究 |
| Effects of environmental factors on nitrogen exchange flux at the sediment-water interface in the water level fluctuation zone of Miyun reservoir |
| 投稿时间：2021-09-13 |
| DOI：10.11654/jaes.2021-1053 |
| 中文关键词: 消落带 沉积物-水界面 环境因子 氮交换通量 |
| 英文关键词: fluctuation zone sediment-water interface environmental factor exchange flux |
| 基金项目:北京市自然科学基金委员会-北京市教育委员会联合资助重点项目（KZ201810028047）；国家自然科学基金项目（21377168，41271495） |
|
| 摘要点击次数: 1031 |
| 全文下载次数: 839 |
| 中文摘要: |
| 为探究不同环境因子对水库消落带沉积物中氮迁移释放的影响，以密云水库消落带为研究对象，采用原状泥柱静态培养实验，并通过单一影响因素法，开展了温度、上覆水pH、溶解氧对沉积物-水界面氮交换通量的影响研究。结果表明：消落带上覆水和沉积物中无机氮含量在夏季（落干期）和秋季（淹水期）存在明显的差异，其中沉积物中NH4+-N含量变化最大，秋季较夏季下降80.4%，NO3--N含量下降59.7%，淹水期间三态氮（NH4+-N、NO2--N、NO3--N）由沉积物释放到水中。温度、pH和溶解氧对消落带沉积物-水界面氮的迁移转化作用存在差异，升温促进NH4+释放并抑制NO3--N释放，偏酸和偏碱条件会促进NH4+-N的释放，有氧条件会加剧沉积物-水界面三态氮的交换，促进三态氮的释放。密云水库消落带沉积物C/N为7.51~9.35，其表层水体中的有机质主要来源于水体内部生物残体。因此，未来应关注密云水库消落带沉积物内源释放风险，同时完善消落带湿地建设，减少消落带氮流失对水体的污染。 |
| 英文摘要: |
| To investigate the response of nitrogen at the sediment-water interface in the water level fluctuation zone under different environmental conditions（e.g., temperature, pH, and dissolved oxygen）, a static culture experiment was conducted in an undisturbed mud column using sediment and water samples collected from the Miyun reservoir. The results were as follows：the inorganic nitrogen content of the sediment and overlying water in the fluctuation zone was significantly different in summer（dry period）and autumn（flooded period）. Among them, the NH4+-N content of the sediment showed the greatest change, decreasing by 80.4% in autumn compared with summer, while the NO3--N content decreased by 59.7% in autumn. Tri-state nitrogen（NH4+-N, NO2--N, NO3--N）was released into the water from the sediment during flooding. Temperature, pH, and dissolved oxygen had different effects on the migration and transformation of nitrogen at the sediment-water interface in the fluctuation zone. Increasing the temperature promoted the release of NH4+-N and inhibited the release of NO3--N. Acidic and alkaline conditions promoted the release of NH4+-N. Aerobic conditions intensified the exchange of tri-state nitrogen at the sediment-water interface and aggravated the release of three-state nitrogen. The C / N ratio（7.51~9.35）of sediment indicates that organic matter in the surface water is mainly derived from biological residues in the water. Therefore, attention should be paid to the risk of endogenous release by sediments in the fluctuation zone of the Miyun reservoir in the future, and the construction of wetlands should be improved to reduce the pollution caused by nitrogen loss in the fluctuation zone. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
