Spatial variations in CO2 fluxes in a subtropical coastal reservoir of Southeast China were related to urbanization and land-use types

Zhang, Yifei; Lyu, Min; Yang, Ping; Lai, Derrick Y.F.; Tong, Chuan; Zhao, Guanglei; Li, Ling; Zhang, Yuhan; Yang, Hong

doi:10.1016/j.jes.2021.04.003

Cited by 18 publications

(3 citation statements)

References 81 publications

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“…S7c), indicating that the direct external input of CO 2 may significantly fuel the CO 2 level (Stets et al 2009; Weyhenmeyer et al 2015; Wilkinson et al 2016). Thus, significantly higher CO 2 in the river mouth can be interpreted as a consequence of external nutrient and carbon input from the watershed, which would stimulate microbial activities and enhance respiration, resulting in more CO 2 production (Sobek et al 2005; Kortelainen et al 2006; Zhang et al 2021).…”

Section: Discussionmentioning

confidence: 99%

Eutrophication and temperature drive large variability in carbon dioxide from China's Lake Taihu

Xiao

Duan

Qin

et al. 2021

Limnology & Oceanography

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Eutrophication and warming are changing the functioning of lake ecosystems, and their impacts on lake carbon dioxide (CO 2 ) variability have received increasing attention. However, how eutrophication and warming change lakes' carbon cycle has not been determined. Here, the surface partial pressure of CO 2 (pCO 2 ) and CO 2 flux in Lake Taihu, a large and eutrophic lake in eastern China, was investigated based on monthly samplings over a 24-yr period , during which the lake experienced profound anthropogenic and climate changes. The results showed that eutrophication caused by nutrient enrichment plays a role in three aspects:(1) nutrient concentrations controlled the CO 2 variability on decadal scales; (2) peak pCO 2 and CO 2 fluxes occurred in river mouths due to large external nutrient loading inputs; and (3) eutrophication effects on CO 2 varied among subzones, which was linked to external inputs and in-lake primary production. Meanwhile, temperature controls the seasonal variation in CO 2 by stimulating primary production, leading to significantly lower pCO 2 and CO 2 fluxes in warm seasons with algal blooms. Further analysis suggested that temperature effects varied spatially and temporally, high nutrient loading may confound the temperature effects via stimulating CO 2 production. To our knowledge, this study presents the longest field measurements (24 yr) of CO 2 from such large and ice-free freshwater lakes with monthly surveys, which may provide a powerful example to demonstrate that eutrophication and warming can shape CO 2 variability from a temporal perspective. Future studies should focus on the interactive warming and eutrophication effects to accurately predict future CO 2 emission.

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Section: Discussionmentioning

confidence: 99%

Eutrophication and temperature drive large variability in carbon dioxide from China's Lake Taihu

Xiao

Duan

Qin

et al. 2021

Limnology & Oceanography

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show abstract

“…Consistent with past enclosure experiments, , increased bioavailable N content in the water column of P-rich ecosystems led to elevated chl a concentrations (Figure d), reductions of pCO 2 to below atmospheric levels, and in-gassing of atmospheric CO 2 emissions (Figure ). Elevated phytoplankton biomass has also been shown to decrease CO 2 efflux in diverse naturally occurring and artificially constructed inland waters. ,,, …”

Section: Discussionmentioning

confidence: 99%

“…Elevated phytoplankton biomass has also been shown to decrease CO 2 efflux in diverse naturally occurring and artificially constructed inland waters. 8,21,42,51 Over the subannual time scale considered here, primary production appears to be the most influential factor in regulating CO 2 dynamics. While seasonal variation in pH is The models were used to analyze the partial pressures and emissions rates of the three GHGs and total CO 2 -eq emissions.…”

Section: Sustained Ch 4 Flux Limits Extent Of Change Inmentioning

confidence: 94%

Experimental Ecosystem Eutrophication Causes Offsetting Effects on Emissions of CO₂, CH₄, and N₂O from Agricultural Reservoirs

Chan,

Gushulak,

Leavitt

et al. 2024

Environ. Sci. Technol.

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Despite decades of research and management efforts, eutrophication remains a persistent threat to inland waters. As nutrient pollution intensifies in the coming decades, the implications for aquatic greenhouse gas (GHG) emissions are poorly defined, particularly the responses of individual GHGs: carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O). The biogeochemical controls of each gas can differ, making it difficult to predict the overall effect of nutrient pollution on the net radiative forcing of aquatic ecosystems. Here, we induced eutrophication of small nitrogen (N)-limited agricultural reservoirs and measured changes in diffusive GHG emissions within a beforeafter-control-impact (BACI) study design during June to September 2021. Each gas exhibited a unique response to 300% increases in primary production, with a shift from an overall CO 2 source to a sink, a modest increase in N 2 O flux, and, unexpectedly, no significant change in CH 4 emissions. The lack of net directional change in CO 2 -equivalent GHG emissions in fertilized reservoirs during the summer contrasts findings from empirical studies of eutrophic lakes. Our findings illustrate the difficulty in extrapolating among different sized ecosystems and suggest that forecast 2-fold increases in agricultural N fertilization by 2050 may not result in consistently elevated GHG emissions during summer, at least from small reservoirs in continental grassland regions.

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Assessing carbon greenhouse gas emissions from aquaculture in China based on aquaculture system types, species, environmental conditions and management practices

Zhang

Tang²,

Yang³

et al. 2022

Agriculture, Ecosystems & Environment

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Spatial variations in CO2 fluxes in a subtropical coastal reservoir of Southeast China were related to urbanization and land-use types

Cited by 18 publications

References 81 publications

Eutrophication and temperature drive large variability in carbon dioxide from China's Lake Taihu

Eutrophication and temperature drive large variability in carbon dioxide from China's Lake Taihu

Experimental Ecosystem Eutrophication Causes Offsetting Effects on Emissions of CO₂, CH₄, and N₂O from Agricultural Reservoirs

Assessing carbon greenhouse gas emissions from aquaculture in China based on aquaculture system types, species, environmental conditions and management practices

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Spatial variations in CO2 fluxes in a subtropical coastal reservoir of Southeast China were related to urbanization and land-use types

Cited by 18 publications

References 81 publications

Eutrophication and temperature drive large variability in carbon dioxide from China's Lake Taihu

Eutrophication and temperature drive large variability in carbon dioxide from China's Lake Taihu

Experimental Ecosystem Eutrophication Causes Offsetting Effects on Emissions of CO2, CH4, and N2O from Agricultural Reservoirs

Assessing carbon greenhouse gas emissions from aquaculture in China based on aquaculture system types, species, environmental conditions and management practices

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Product

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About

Experimental Ecosystem Eutrophication Causes Offsetting Effects on Emissions of CO₂, CH₄, and N₂O from Agricultural Reservoirs