高书铭, 姚爱林, 明玥, 等, xxxx. 2022年黄河调水调沙对下游有机物和营养盐年内变化的影响[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230807001.
引用本文: 高书铭, 姚爱林, 明玥, 等, xxxx. 2022年黄河调水调沙对下游有机物和营养盐年内变化的影响[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230807001.
GAO S M, YAO A L, MING Y, et al, xxxx. The impact of water and sediment regulation on monthly changes of downstream organic matter and nutrients in the Yellow River in 2022[J]. Advances in Marine Science, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230807001
Citation: GAO S M, YAO A L, MING Y, et al, xxxx. The impact of water and sediment regulation on monthly changes of downstream organic matter and nutrients in the Yellow River in 2022[J]. Advances in Marine Science, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230807001

2022年黄河调水调沙对下游有机物和营养盐年内变化的影响

The Impact of Water and Sediment Regulation on Monthly Changes of Downstream Organic Matter and Nutrients in the Yellow River in 2022

  • 摘要: 2021年11月至2022年10月,在黄河下游泺口站进行了为期一年、每月一次的采样,测定了河水中溶解有机碳(dissolved organic matter, DOC)、有色溶解有机物(chromophoric dissolved organic matter, CDOM)、荧光溶解有机物(fluorescent dissolved organic matter, FDOM)、营养盐,以及悬浮颗粒态(suspended particulate matter, SPM)中颗粒有机碳(particulate organic carbon, POC)占比(POC占SPM的质量百分比,POC%)、δ13C和δ15N等生源要素相关指标。结果表明,调水调沙已经成为控制黄河下游多种生源要素在一年之中变化格局的关键因素,决定着其全年变化范围的上限和下限。在调水调沙的调水阶段,脉冲式激增的径流量通过稀释作用使得DOC浓度、CDOM浓度、FDOM中的类腐殖质组分含量,以及SPM中δ13C和δ15N达到全年的最低值,而CDOM光谱斜率(S275–295)达到最高值。在调水调沙的排沙阶段,上述指标则在相反方向上达到全年的极值。最近20年间,在调水调沙、流域生态环境保护、气候变化等一系列措施的影响下,黄河下游营养盐和DOC浓度呈现明显的下降趋势,而POC%的上升迹象也初步显现。黄河下游生源要素浓度、组成、性质、输出通量正经历着复杂而深刻的变化,将直接影响到黄河口的海洋生态环境。本研究有助于进一步理解在人类活动背景下大河生源要素的响应特征和反馈机制及其对邻近海洋生态环境的潜在影响。

     

    Abstract: From November 2021 to October 2022, 12 monthly samplings were conducted at Luokou Station in the lower Yellow River (Huanghe River) to measure dissolved organic carbon (DOC), chromophoric dissolved organic matter (CDOM), fluorescent dissolved organic matter (FDOM), nutrients, as well as the proportion of POC, δ13C and δ15N values in suspended particulate matter (SPM) in the river water. The results indicate that water and sediment regulation (WSR) has become a key factor in controlling the pattern of annual changes in various biogenic elements in the lower yellow river, and determines the upper and lower limits of its annual variation range. During the early stage of WSR, the pulsed increase of river discharge caused the concentration of DOC, CDOM and humic-like components in FDOM, and δ13C and δ15N to their lowest values in a year, through water dilution, while the CDOM spectral slope (S275–295) reached its highest value. In the late stage of WSR, the above parameters reached their annual extreme values in the opposite direction. In the past 20 years, under the influences of WSR, watershed ecological environment protection projects and climate change, the concentrations of nutrients and DOC in the lower Yellow River have shown significant downward trends, while the increase in the proportion of organic matter in SPM has also shown preliminary signs. The concentrations, compositions, properties, and output fluxes of biogenic elements in the lower Yellow River are undergoing complex and profound changes, which will directly affect the marine ecological environment of the Yellow River estuary. This study helps us further understand the response characteristics and feedback mechanisms of major river biogenic elements, as well as their potential impacts on adjacent marine ecosystems, in the context of human activities.

     

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