Yuanbi Yi, Si-Liang Li, Jun Zhong, Kai Wang, Julian Merder, Hongyan Bao, Yulin Qi, Ding He, Sheng Xu, Thorsten Dittmar, Cong-Qiang Liu
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引用次数: 0
摘要
大规模的水库建设使全球 70% 以上的河流支离破碎,严重影响了河流的连通性和碳循环。然而,河流溶解有机物(DOM)对水库影响的反应及其潜在的下游效应仍不清楚。在本研究中,我们采用了多种分析技术,包括傅立叶变换离子回旋共振质谱法、放射性碳年代测定法和环境因子分析法,研究了在不同水文管理制度下,中国第二大河流珠江最大的水库--龙潭水库中 DOM 及其控制因子的动态变化。我们的研究结果表明,水库中河水 DOM 的分子多样性有所降低。富氧化合物和杂原子化合物,如含氮、硫和磷的化合物,在水库中,特别是在蓄水期间,通过增强的光降解和生物降解过程被优先去除。这导致下游的 DOM 富含贫氧化合物,并显示出生物降解的 Δ14C 值。这项研究强调,河流溶解有机物的组成会因水库而发生重大改变,但这些影响有可能通过优化出水口位置而得到缓解。
Assessing the Impacts of Reservoirs on Riverine Dissolved Organic Matter: Insights From the Largest Reservoir in the Pearl River
Extensive reservoir construction has fragmented more than 70% of the world's rivers, significantly impacting river connectivity and carbon cycling. However, the response of riverine dissolved organic matter (DOM) to reservoir influence and its potential downstream effects remains unclear. In this study, we employed multiple analytical techniques, including Fourier transform ion cyclotron resonance mass spectrometry, radiocarbon dating, and environmental factor analysis, to investigate the dynamic changes in DOM and its controlling factors under different hydrological management regimes in the LongTan Reservoir, the largest reservoir in the Pearl River, which is the second largest river in China by water discharge. Our results indicate that the molecular diversity of riverine DOM is reduced in the reservoir. Oxygen-rich and heteroatomic compounds, such as those containing nitrogen, sulfur, and phosphorus, are preferentially removed through enhanced photo- and biodegradation processes in the reservoir, particularly during the storage period. This leads to DOM that is enriched with oxygen-poor compounds and shows a biodegraded Δ14C value downstream. This study highlights that the composition of riverine DOM is significantly altered by the reservoir, but these effects could potentially be mitigated by optimizing the outlet location.
期刊介绍:
JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology