| 白洋淀地表水水质季节与空间变化特征及其影响因素 |
| 摘要点击 1153 全文点击 281 投稿时间：2024-01-16 修订日期：2024-05-07 |
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| 中文关键词 地表水水质 水化学特征 季节与空间变化 影响因素 白洋淀 |
| 英文关键词 surface water quality hydrochemical characteristics seasonal and spatial variation influence factors Baiyangdian Lake |
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| 中文摘要 |
| 白洋淀是雄安新区的核心生态功能区,为揭示白洋淀地表水质量及其变化趋势、重要水质指标随季节变化趋势、空间变化特征及其影响因素,综合利用统计描述、离子图解和因子分析等方法,系统地对白洋淀地表水水质进行研究. 结果表明,白洋淀地表水质量逐渐向好,至2020年夏季白洋淀水质以Ⅳ类水为主. COD、高锰酸盐指数、TP和TN是影响白洋淀水质的关键指标,重点解析了此4项关键指标的时空变化特征,研究空间变化发现白洋淀地表水中难被氧化的耗氧物质含量高,且入淀河流所携物质直接影响入淀口附近水质；时间变化特征表明在生态补水背景下,地表水中污染物浓度水平显著下降,水质得到明显改善. 白洋淀地表水水化学类型以HCO3-Na型为主,TDS及主要离子质量浓度表现出南高北低的特征,常量离子组分主要来源于硅酸盐岩风化溶解；微量水化学组分受天然和人为因素共同控制,天然来源为岩石风化,人为因素包括大气沉降、农业和工业来源,且叠加有机污染影响. 研究结果可为白洋淀水生态保护与修复提供科学支撑. |
| 英文摘要 |
| Baiyangdian Lake is the major ecological function area of Xiongan New Area. To reveal the surface water quality and its changing trends, seasonal changing trends, spatial changing characteristics, and influencing factors of the important indicators of the surface water,statistical description,ion diagrams,factor analysis, and other methods were comprehensively used to systematically study the surface water quality of Baiyangdian Lake. The results showed that the surface water quality of Baiyangdian Lake was gradually improving,and the water quality was mainly Class IV by 2020. COD,permanganate index,total nitrogen, and total phosphorus were key indicators that affected the water quality of Baiyangdian Lake. The spatial and temporal variation characteristics of these four key indicators were analyzed. The study of spatial change characteristics revealed that the content of oxygen-consuming substances that were difficult to be oxidized in the surface water was high,and the substances carried by the river entering Baiyangdian Lake directly affected the water quality near the entrance of the lake. The time variation characteristics indicated that under the background of ecological water replenishment,the concentration level of pollutants in surface water had significantly decreased, and the water quality had been significantly improved. The hydrochemical type of the surface water was mainly HCO3-Na type. TDS and the main ion concentrations were higher in the south and lower in the north. The constant ion components mainly originated from the weathering and dissolution of silicate rocks；the trace water chemical components were affected by natural and man-made factors. The natural source was rock weathering. The man-made factors included atmospheric deposition,agricultural and industrial sources,and the superimposed impact of organic pollution. The research results can provide scientific support for the protection and restoration of Baiyangdian Lake ecology. |
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