Journal of Changjiang River Scientific Research Institute ›› 2016, Vol. 33 ›› Issue (8): 28-33.DOI: 10.11988/ckyyb.20150289

• WATER RESOURCES AND ENVIRONMENT • Previous Articles     Next Articles

Diel Greenhouse Emissions from an Eutrophic Pond in Summer

ZHANG Cheng1,2, LONG Li3, Lü Xin-biao1, LI Ying-chen3, PENG Feng3   

  1. 1.College of Earth Resource, China University of Geosciences, Wuhan 430074, China;
    2.College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002,China;
    3.College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002,China
  • Received:2015-04-10 Revised:2015-05-07 Published:2016-07-25 Online:2016-07-25

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Abstract: Methane (CH4) and Carbon dioxide (CO2) emission pathways in summer were quantified during a 48 hours online survey of a subtropical shallow pond in Yichang, China. We separated the diel bubble and diffusion gas fluxes measured by the DLT-100 Analyzer (Los Gatos Research, USA) thanks to its high sampling frequency. The total emission fluxes of CH4 and CO2 were 595.2 mg/(m2·d) and 1450.8 mg/(m2·d) respectively. Bubble emissions of CH4 and CO2 accounted for 99.7% of the total CH4 emission and only 3.0% of the total CO2 from the pond. Bubble emissions are highly time-variable in the observation period, with the biggest CH4 bubbling rate of 424.28 mg/(m2·h), accounting for 35.75% of the two days’ total bubbling CH4 emissions, but ebullition CH4 flux was mainly located at <20 mg/(m2·h). The maximums of the diel diffusion CH4 and CO2 flux were 6.0 and 6.5 times of the responding minimums respectively.

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