在沙河水库 (北京,中国) 的有机物质的时空分布特征和可追溯性分析
Sun Wen1,2, Zhang Yang3, Peng Biao1,4
1Shaanxi Provincial Land Engineering Construction Group, Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources, Xi'an, 710075, China.
Scientific reports
|December 6, 2023
概括
沙河水库的低水运行改善了水质,减少了沉积物有机物. 有机物主要来自内部来源,这表明从沉积物中释放的营养物质需要控制污染管理.
科学领域:
- 环境科学 环境科学
- 水质管理水质管理
- 沉积物学的沉积物学
背景情况:
- 沙河水库是北运河上游的重要组成部分,在2018年实施低水运行后,水质有所改善.
- 在政策变化后,沉积物有机物 (OM) 含量从16.66%降至14.22%.
研究的目的:
- 在低水位操作 (LWLO) 之前和期间调查沙河水库沉积物中有机物 (OM) 和溶解有机物 (DOM) 的可追溯性.
- 在不同的水位条件下分析OM和DOM的来源和营养相关性.
主要方法:
- 使用光指数 (FI) 和正矩阵因子化 (PMF) 方法来识别OM和DOM源.
- 采用皮尔森相关性分析和主要成分分析 (PCA) 来研究OM-营养关系.
- 沉积物和间歇水中的量化营养水平 (TN,TP,NH4+-N,PO43--P).
主要成果:
- 沉积物OM主要来源于陆地植物残留物,通过雨季的支流和溢出.
- DOM来源主要是外源性,与微生物和藻类有关,内部来源贡献了大多数DOM污染物.
- 沉积物和间歇水中的营养水平 (TN,TP) 在LWLO期间显著增加,与OM有很强的相关性.
结论:
- 沙河水库的有机物污染控制应该集中在管理从沉积物中释放的内源营养物质上.
- 这些发现强调了内部沉积物过程在水库水质动态中的重要性.
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