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https://doi.org/10.5194/bg-2020-178
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-178
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Jul 2020

01 Jul 2020

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This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The manuscript was not accepted for further review after discussion.

Diel and seasonal variability of methane emissions from a shallow and eutrophic pond

Wenli Zhang1, Shangbin Xiao2, Heng Xie1, Jia Liu2, Dan Lei2, and Andreas Lorke3 Wenli Zhang et al.
  • 1Hubei International Scientific and Technological Cooperation Center of Ecological Conservation and Management in Three Gorges Area, China Three Gorges University, Yichang, 443002, China
  • 2College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, 443002, China
  • 3Institute for Environmental Sciences, University of Koblenz-Landau, Landau, Germany

Abstract. Ponds play a critical role in biogeochemical carbon cycling and have been identified as hot spots of methane (CH4) emission. Yet, most existing studies focused on ponds in the boreal zone and current estimates of the relevance of ponds in global CH4 budgets as well as knowledge of the environmental factors regulating their emissions are poorly constrained. Both nutrient concentration and temperature can potentially alter CH4 dynamics in shallow ponds, but there are still few investigations into the response of CH4 emission to nutrient enrichment and rising temperatures. Here we studied the magnitude and regulation of two CH4 pathways (diffusion and ebullition) from a shallow and eutrophic pond located in the subtropical zone in Central China. Ebullitive fluxes were on average 96.4 mg CH4 m−2 d−1 and contributed 88.6 % to the total (diffusive + ebullition) CH4 emissions. Daily CH4 fluxes were related to daily mean water temperature, with ebullition having a stronger temperature dependence than diffusion (Q10 of 5.52 vs. 2.05). Relationships between temperature and CH4 emission were affected by seasonal variation of the concentration of total phosphorus. The temperature dependence of both ebullitive and diffusive fluxes increased with increasing phosphorous concentration. Our study highlights that increasing eutrophication by anthropogenic impacts and climate warming will increase CH4 emissions from ponds, thus representing a positive feedback mechanism to global warming.

Wenli Zhang et al.

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Wenli Zhang et al.

Wenli Zhang et al.

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Short summary
We analyzed CH4 emissions from a shallow and small eutrophic pond and found that 88.6 % of CH4 emissions was directly released by bubbling. The higher the temperature, the higher the eutrophication level and the greater the amount of methane released. Our study highlights that increasing eutrophication by anthropogenic impacts and climate warming will increase CH4 emissions from ponds, thus representing a positive feedback mechanism to global warming.
We analyzed CH4 emissions from a shallow and small eutrophic pond and found that 88.6 % of CH4...
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