Changes in CO2 concentration and degassing of eutrophic urban lakes associated with algal growth and decline

Zhang, Liuqing; Xu, Y. Jun; Li, Siyue

doi:10.1016/j.envres.2023.117031

Cited by 10 publications

(2 citation statements)

References 83 publications

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“…What is noteworthy is that CO 2 emissions were not only subject to lake nutrient loadings, but also controlled by seasonal variation of ambient conditions, as exhibited in recent studies in subtropic urban eutrophic lakes [54,73]. Sun et al [19] and Zhang et al [54] found eutrophic lakes converted to be CO 2 sinks in summer due to higher primary productivity, which was different from our results in Lake Tangxun. This implied that seasonal sampling can lead to large uncertainty of lake CO 2 emission.…”

Section: Implications Of Co 2 and Ch 4 Fluxcontrasting

confidence: 99%

“…The effect of eutrophication on CO 2 was closely bound up the interaction of CO 2 consumption and production [26,52]. Previous studies have found algae blooms enabled the lake to absorb CO 2 from the atmosphere [53,54]. We, however, observed an atmospheric CO 2 source of the studied lake even in the summer season, with much higher Chl-a concentration.…”

Section: Pco 2 Control Factorsmentioning

confidence: 61%

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The Influence of Seasonal Variability of Eutrophication Indicators on Carbon Dioxide and Methane Diffusive Emissions in the Largest Shallow Urban Lake in China

Ma,

Wang,

Jiang

et al. 2023

Water

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Eutrophication is prevalent in urban lakes; however, a knowledge gap exists regarding eutrophication influences on carbon dynamics in these ecosystems. In the present study, we investigated the carbon dioxide (CO2) and methane (CH4) concentration and diffusion fluxes in Lake Tangxun (the largest shallow Chinese urban lake) in the autumn and winter of 2022 and spring and summer of 2023. We found that Lake Tangxun served as a source of GHGs, with average emission rates of 5.52 ± 12.16 mmol CO2 m−2 d−1 and 0.83 ± 2.81 mmol CH4 m−2 d−1, respectively. The partial pressure of dissolved CO2 (pCO2) (averaging 1321.39 ± 1614.63 μatm) and dissolved CH4 (dCH4) (averaging 4.29 ± 13.71 μmol L−1) exceeded saturation levels. Seasonal variability was observed in the pCO2 and dCH4 as well as CH4 fluxes, while the CO2 flux remained constant. The mean pCO2 and dCH4, as well as carbon emissions, were generally higher in summer and spring. pCO2 and dCH4 levels were significantly related to total nitrogen (TN), total phosphorus (TP), and ammonium-nitrogen (N-NH4+), and N-NH4+ was a main influencing factor of pCO2 and dCH4 in urban eutrophic lakes. The positive relationships of pCO2, dCH4 and trophic state index highlighted that eutrophication could elevate CO2 and CH4 emissions from the lake. This study highlights the fact that eutrophication can significantly increase carbon emissions in shallow urban lakes and that urban lakes are substantial contributors to the global carbon budget.

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