Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO2 emissions from a major Chinese reservoir

Ting Zhang; Lei Zhou; Yongqiang Zhou; Yunlin Zhang; Jinxin Guo; Yicai Han; Yayan Zhang; Liang Hu; Kyoung Soon Jang; Robert G.M. Spencer; Justin D. Brookes; Jan Dolfing; Erik Jeppesen

doi:10.1016/j.watres.2024.121155

Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO₂ emissions from a major Chinese reservoir

Ting Zhang, Lei Zhou^*, Yongqiang Zhou, Yunlin Zhang, Jinxin Guo, Yicai Han, Yayan Zhang, Liang Hu, Kyoung Soon Jang, Robert G.M. Spencer, Justin D. Brookes, Jan Dolfing, Erik Jeppesen

^*Corresponding author for this work

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6 Citations (Scopus)

Abstract

Terrestrial inputs and subsequent degradation of dissolved organic matter (DOM) in lake ecosystems can result in rapid depletion of dissolved oxygen (DO). Inputs of terrestrial DOM including organic acids can also lead to decreases in pH. However, to date, few studies have investigated the linkages between terrestrial DOM inputs, DO and pH levels in the water column, and carbon dioxide (CO₂) emissions from lake ecosystems. Based on monthly field sampling campaigns across 100 sites in Lake Qiandao, a major man-made drinking water reservoir in China, from May 2020 to April 2021, we estimated an annual CO₂ efflux (FCO₂) of 37.2 ± 29.0 gC m⁻² yr⁻¹, corresponding to 0.02 ± 0.02 TgC yr⁻¹ from this lake. FCO₂ increased significantly with decreasing DO, chlorophyll-a (Chl-a) and δ²H-H₂O, while FCO₂ increased with increasing specific UV absorbance (SUVA₂₅₄) and a terrestrial humic-like component (C2). We found that DO concentration and pH declined with increasing terrestrial DOM inputs, i.e. increased SUVA₂₅₄ and terrestrial humic-like C2 levels. Vertical profile sampling revealed that the partial pressure of CO₂ (pCO₂) increased with increasing terrestrial DOM fluorescence (FDOM), while DO, pH, and δ¹³C-CO₂ declined with increasing terrestrial FDOM. These results highlight the importance of terrestrial DOM inputs in altering physico-chemical environments and fueling CO₂ emissions from this lake and potentially other aquatic ecosystems.

Original language	English
Article number	121155
Journal	Water Research
Volume	251
Number of pages	11
ISSN	0043-1354
DOIs	https://doi.org/10.1016/j.watres.2024.121155
Publication status	Published - Mar 2024

Keywords

CO
Dissolved organic matter (DOM)
Dissolved oxygen (DO)
FT-ICR MS
Lake Qiandao
pH

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10.1016/j.watres.2024.121155

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Zhang, T., Zhou, L., Zhou, Y., Zhang, Y., Guo, J., Han, Y., Zhang, Y., Hu, L., Jang, K. S., Spencer, R. G. M., Brookes, J. D., Dolfing, J., & Jeppesen, E. (2024). Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO₂ emissions from a major Chinese reservoir. Water Research, 251, Article 121155. https://doi.org/10.1016/j.watres.2024.121155

@article{9706312667ec41d1a5dad1289998906e,

title = "Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO2 emissions from a major Chinese reservoir",

abstract = "Terrestrial inputs and subsequent degradation of dissolved organic matter (DOM) in lake ecosystems can result in rapid depletion of dissolved oxygen (DO). Inputs of terrestrial DOM including organic acids can also lead to decreases in pH. However, to date, few studies have investigated the linkages between terrestrial DOM inputs, DO and pH levels in the water column, and carbon dioxide (CO2) emissions from lake ecosystems. Based on monthly field sampling campaigns across 100 sites in Lake Qiandao, a major man-made drinking water reservoir in China, from May 2020 to April 2021, we estimated an annual CO2 efflux (FCO2) of 37.2 ± 29.0 gC m−2 yr−1, corresponding to 0.02 ± 0.02 TgC yr−1 from this lake. FCO2 increased significantly with decreasing DO, chlorophyll-a (Chl-a) and δ2H-H2O, while FCO2 increased with increasing specific UV absorbance (SUVA254) and a terrestrial humic-like component (C2). We found that DO concentration and pH declined with increasing terrestrial DOM inputs, i.e. increased SUVA254 and terrestrial humic-like C2 levels. Vertical profile sampling revealed that the partial pressure of CO2 (pCO2) increased with increasing terrestrial DOM fluorescence (FDOM), while DO, pH, and δ13C-CO2 declined with increasing terrestrial FDOM. These results highlight the importance of terrestrial DOM inputs in altering physico-chemical environments and fueling CO2 emissions from this lake and potentially other aquatic ecosystems.",

keywords = "CO, Dissolved organic matter (DOM), Dissolved oxygen (DO), FT-ICR MS, Lake Qiandao, pH",

author = "Ting Zhang and Lei Zhou and Yongqiang Zhou and Yunlin Zhang and Jinxin Guo and Yicai Han and Yayan Zhang and Liang Hu and Jang, {Kyoung Soon} and Spencer, {Robert G.M.} and Brookes, {Justin D.} and Jan Dolfing and Erik Jeppesen",

note = "Publisher Copyright: {\textcopyright} 2024 Elsevier Ltd",

year = "2024",

month = mar,

doi = "10.1016/j.watres.2024.121155",

language = "English",

volume = "251",

journal = "Water Research",

issn = "0043-1354",

publisher = "I W A Publishing",

}

Zhang, T, Zhou, L, Zhou, Y, Zhang, Y, Guo, J, Han, Y, Zhang, Y, Hu, L, Jang, KS, Spencer, RGM, Brookes, JD, Dolfing, J & Jeppesen, E 2024, 'Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO₂ emissions from a major Chinese reservoir', Water Research, vol. 251, 121155. https://doi.org/10.1016/j.watres.2024.121155

Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO₂ emissions from a major Chinese reservoir. / Zhang, Ting; Zhou, Lei; Zhou, Yongqiang et al.
In: Water Research, Vol. 251, 121155, 03.2024.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO2 emissions from a major Chinese reservoir

AU - Zhang, Ting

AU - Zhou, Lei

AU - Zhou, Yongqiang

AU - Zhang, Yunlin

AU - Guo, Jinxin

AU - Han, Yicai

AU - Zhang, Yayan

AU - Hu, Liang

AU - Jang, Kyoung Soon

AU - Spencer, Robert G.M.

AU - Brookes, Justin D.

AU - Dolfing, Jan

AU - Jeppesen, Erik

PY - 2024/3

Y1 - 2024/3

N2 - Terrestrial inputs and subsequent degradation of dissolved organic matter (DOM) in lake ecosystems can result in rapid depletion of dissolved oxygen (DO). Inputs of terrestrial DOM including organic acids can also lead to decreases in pH. However, to date, few studies have investigated the linkages between terrestrial DOM inputs, DO and pH levels in the water column, and carbon dioxide (CO2) emissions from lake ecosystems. Based on monthly field sampling campaigns across 100 sites in Lake Qiandao, a major man-made drinking water reservoir in China, from May 2020 to April 2021, we estimated an annual CO2 efflux (FCO2) of 37.2 ± 29.0 gC m−2 yr−1, corresponding to 0.02 ± 0.02 TgC yr−1 from this lake. FCO2 increased significantly with decreasing DO, chlorophyll-a (Chl-a) and δ2H-H2O, while FCO2 increased with increasing specific UV absorbance (SUVA254) and a terrestrial humic-like component (C2). We found that DO concentration and pH declined with increasing terrestrial DOM inputs, i.e. increased SUVA254 and terrestrial humic-like C2 levels. Vertical profile sampling revealed that the partial pressure of CO2 (pCO2) increased with increasing terrestrial DOM fluorescence (FDOM), while DO, pH, and δ13C-CO2 declined with increasing terrestrial FDOM. These results highlight the importance of terrestrial DOM inputs in altering physico-chemical environments and fueling CO2 emissions from this lake and potentially other aquatic ecosystems.

AB - Terrestrial inputs and subsequent degradation of dissolved organic matter (DOM) in lake ecosystems can result in rapid depletion of dissolved oxygen (DO). Inputs of terrestrial DOM including organic acids can also lead to decreases in pH. However, to date, few studies have investigated the linkages between terrestrial DOM inputs, DO and pH levels in the water column, and carbon dioxide (CO2) emissions from lake ecosystems. Based on monthly field sampling campaigns across 100 sites in Lake Qiandao, a major man-made drinking water reservoir in China, from May 2020 to April 2021, we estimated an annual CO2 efflux (FCO2) of 37.2 ± 29.0 gC m−2 yr−1, corresponding to 0.02 ± 0.02 TgC yr−1 from this lake. FCO2 increased significantly with decreasing DO, chlorophyll-a (Chl-a) and δ2H-H2O, while FCO2 increased with increasing specific UV absorbance (SUVA254) and a terrestrial humic-like component (C2). We found that DO concentration and pH declined with increasing terrestrial DOM inputs, i.e. increased SUVA254 and terrestrial humic-like C2 levels. Vertical profile sampling revealed that the partial pressure of CO2 (pCO2) increased with increasing terrestrial DOM fluorescence (FDOM), while DO, pH, and δ13C-CO2 declined with increasing terrestrial FDOM. These results highlight the importance of terrestrial DOM inputs in altering physico-chemical environments and fueling CO2 emissions from this lake and potentially other aquatic ecosystems.

KW - CO

KW - Dissolved organic matter (DOM)

KW - Dissolved oxygen (DO)

KW - FT-ICR MS

KW - Lake Qiandao

KW - pH

UR - http://www.scopus.com/inward/record.url?scp=85183478407&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2024.121155

DO - 10.1016/j.watres.2024.121155

M3 - Journal article

C2 - 38277827

AN - SCOPUS:85183478407

SN - 0043-1354

VL - 251

JO - Water Research

JF - Water Research

M1 - 121155

ER -

Terrestrial dissolved organic matter inputs accompanied by dissolved oxygen depletion and declining pH exacerbate CO₂ emissions from a major Chinese reservoir

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