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Cascading river damming amplifies photosynthetic organic matter production and DOC transport.

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Title: Cascading river damming amplifies photosynthetic organic matter production and DOC transport.
Authors: He, Dengming1,2 (AUTHOR), Wang, Wanfa1,2 (AUTHOR) wfwang@gzu.edu.cn, Yi, Yuanbi1,3,4 (AUTHOR) yuanbiyi@ust.hk, Zhong, Jun5 (AUTHOR), Mostofa, Khan M.G.5 (AUTHOR), Hu, Xuan1,2 (AUTHOR), Shi, Wenhong1,2 (AUTHOR), He, Ding3,4 (AUTHOR), Li, Si-Liang5 (AUTHOR)
Source: Water Research. Sep2025, Vol. 284, pN.PAG-N.PAG. 1p.
Subjects: Dissolved organic matter, Carbon cycle, Hydrologic models, Organic compounds, Reservoir ecology, Dam design & construction, Carbon sequestration
Abstract: • Karst cascade dams amplify the biological carbon pump (BCP) effect in lentic areas. • Strong BCP drives DOC increase by enhancing photosynthetic organic matter yield. • Reservoirs with short hydraulic retention time mitigate cascade dams' alteration of riverine DOM. • Cascade dams amplify DOC transport by altering hydrological connectivity and riverine DOM dynamics. Large-scale damming of global rivers has fundamentally altered hydrological connectivity and carbon cycling dynamics. However, cascade damming effects on the transport and transformation processes of dissolved organic matter (DOM) remain unclear. To address this, we integrated water chemistry, nutrient concentrations, optical properties, dual carbon isotopes (δ13C and Δ14C), and structural equation modeling (SEM) to elucidate organic carbon dynamics and underlying controlling mechanisms across the Wujiang cascade reservoirs. Results demonstrated intensified photosynthetic OM production during the thermally stratified period (April–October), evidenced by higher epilimnetic chlorophyll-a (8.0 ± 8.5 vs 1.0 ± 0.7 µg L −1) and increased DOC concentrations (1.3 ± 0.5 vs. 0.9 ± 0.1 mg L −1) compared to the vertical mixing period (January). Concurrently, isotopic evidence from enriched δ13C DIC values and modern Δ14C POC signatures in the epilimnion confirmed intensification of the biological carbon pump (BCP) effect, coinciding with dissolved inorganic carbon (DIC) uptake (29.0 ± 2.5 vs. 26.5 ± 5.2 mg L −1) and nutrient assimilation (nitrate, 3.2 ± 0.6 vs. 2.7 ± 1.1 mg L −1; phosphate, 92.1 ± 61.2 vs. 65.8 ± 76.3 µg L −1). The SEM analysis identified DIC as the primary regulator of BCP strength across the cascade reservoirs (r = −0.679, p < 0.001). It is estimated that the annual DOC flux increased 17-fold from upstream (1076 ± 142 t yr⁻¹) to downstream reservoirs outlet (18,476 ± 667 t yr⁻¹), primarily governed by riverine DOM dynamics and hydrological regulation. Our findings reveal that cascade reservoirs profoundly alter biogeochemical processes related to DOM. With the increasing number of global reservoirs, elucidating the organic carbon dynamics of cascade reservoirs is crucial for accurate carbon budgeting and science-based reservoir management. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Water Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Cascading river damming amplifies photosynthetic organic matter production and DOC transport.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22He%2C+Dengming%22&quot;&gt;He, Dengming&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Wang%2C+Wanfa%22&quot;&gt;Wang, Wanfa&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; wfwang@gzu.edu.cn&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Yi%2C+Yuanbi%22&quot;&gt;Yi, Yuanbi&lt;/searchLink&gt;&lt;relatesTo&gt;1,3,4&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; yuanbiyi@ust.hk&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zhong%2C+Jun%22&quot;&gt;Zhong, Jun&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Mostofa%2C+Khan+M%2EG%2E%22&quot;&gt;Mostofa, Khan M.G.&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Hu%2C+Xuan%22&quot;&gt;Hu, Xuan&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Shi%2C+Wenhong%22&quot;&gt;Shi, Wenhong&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22He%2C+Ding%22&quot;&gt;He, Ding&lt;/searchLink&gt;&lt;relatesTo&gt;3,4&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Li%2C+Si-Liang%22&quot;&gt;Li, Si-Liang&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)
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  Data: • Karst cascade dams amplify the biological carbon pump (BCP) effect in lentic areas. • Strong BCP drives DOC increase by enhancing photosynthetic organic matter yield. • Reservoirs with short hydraulic retention time mitigate cascade dams&#39; alteration of riverine DOM. • Cascade dams amplify DOC transport by altering hydrological connectivity and riverine DOM dynamics. Large-scale damming of global rivers has fundamentally altered hydrological connectivity and carbon cycling dynamics. However, cascade damming effects on the transport and transformation processes of dissolved organic matter (DOM) remain unclear. To address this, we integrated water chemistry, nutrient concentrations, optical properties, dual carbon isotopes (δ13C and Δ14C), and structural equation modeling (SEM) to elucidate organic carbon dynamics and underlying controlling mechanisms across the Wujiang cascade reservoirs. Results demonstrated intensified photosynthetic OM production during the thermally stratified period (April–October), evidenced by higher epilimnetic chlorophyll-a (8.0 &#177; 8.5 vs 1.0 &#177; 0.7 &#181;g L −1) and increased DOC concentrations (1.3 &#177; 0.5 vs. 0.9 &#177; 0.1 mg L −1) compared to the vertical mixing period (January). Concurrently, isotopic evidence from enriched δ13C DIC values and modern Δ14C POC signatures in the epilimnion confirmed intensification of the biological carbon pump (BCP) effect, coinciding with dissolved inorganic carbon (DIC) uptake (29.0 &#177; 2.5 vs. 26.5 &#177; 5.2 mg L −1) and nutrient assimilation (nitrate, 3.2 &#177; 0.6 vs. 2.7 &#177; 1.1 mg L −1; phosphate, 92.1 &#177; 61.2 vs. 65.8 &#177; 76.3 &#181;g L −1). The SEM analysis identified DIC as the primary regulator of BCP strength across the cascade reservoirs (r = −0.679, p &lt; 0.001). It is estimated that the annual DOC flux increased 17-fold from upstream (1076 &#177; 142 t yr⁻&#185;) to downstream reservoirs outlet (18,476 &#177; 667 t yr⁻&#185;), primarily governed by riverine DOM dynamics and hydrological regulation. Our findings reveal that cascade reservoirs profoundly alter biogeochemical processes related to DOM. With the increasing number of global reservoirs, elucidating the organic carbon dynamics of cascade reservoirs is crucial for accurate carbon budgeting and science-based reservoir management. [Display omitted] [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Water Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.watres.2025.124036
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Dissolved organic matter
        Type: general
      – SubjectFull: Carbon cycle
        Type: general
      – SubjectFull: Hydrologic models
        Type: general
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Reservoir ecology
        Type: general
      – SubjectFull: Dam design & construction
        Type: general
      – SubjectFull: Carbon sequestration
        Type: general
    Titles:
      – TitleFull: Cascading river damming amplifies photosynthetic organic matter production and DOC transport.
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            NameFull: He, Dengming
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              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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              Value: 284
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