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Contrasting effects of aeration on methane (CH4) and nitrous oxide (N2O) emissions from subtropical aquaculture ponds and implications for global warming mitigation
Ping Yang, Kam Tang , Hong Yang, Chuan Tong, Linhai Zhang, Derrick Y.F. Lai, Yan Hong, Lishan Tan, Wanyi Zhu, Chen Tang
Journal of Hydrology, Volume: 617, Start page: 128876
Swansea University Author: Kam Tang
Accepted Manuscript under embargo until: 9th December 2023
DOI (Published version): 10.1016/j.jhydrol.2022.128876
The increasing number of small-hold aquaculture ponds for food production globally has raised concerns of their emission of greenhouse gases (GHGs) such as methane (CH4) and nitrous oxide (N2O). Aeration is commonly applied to improve oxygen supply for the farmed animals, but it could have opposite...
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The increasing number of small-hold aquaculture ponds for food production globally has raised concerns of their emission of greenhouse gases (GHGs) such as methane (CH4) and nitrous oxide (N2O). Aeration is commonly applied to improve oxygen supply for the farmed animals, but it could have opposite effects on GHG emission: It may inhibit anaerobic microbial processes that produce GHGs; it may also increase water-to-air GHG exchange via physical agitation. To resolve the overall effect of aeration on GHG emissions, this study analyzed and compared the monthly CH4 and N2O emissions from earthen shrimp ponds with and without aeration, in the farming period for two consecutive years, in an estuary in subtropical southeastern China. CH4 flux was mainly influenced by water temperature and dissolved oxygen, and it was significantly higher in non-aerated pond (7.6 mg m-2 h-1) than in aerated ponds (4.5 mg m-2 h-1), with ebullition accounting for >90% of the emission. Conversely, non-aerated pond had ca. 50% lower N2O flux than aerated ponds, and dissolved nitrate was the main driving factor. The combined CO2-equivalent emission in aerated ponds (avg. 10,829 kg CO2-eq ha-1 yr-1) was substantially lower than that in non-aerated pond (avg. 17,627 kg CO2-eq ha-1 yr-1). While aeration may increase diffusive flux of GHGs via physical agitation, it remains a simple and effective management practice to decrease the overall climate impact of aquaculture ponds.
Artificial aerationl; Greenhouse gases (GHGs) emission; Sustained-flux global warming potential (SGWP); Climate mitigation; Aquaculture pond
Faculty of Science and Engineering
This research was funded by the National Natural Science Foundation of China (NNSFC) (No. 41801070, 41671088), the National Natural Science Foundation of Fujian Province (NNSFF) (No. 2018J01737, 2020J01136), and the Minjiang Scholar Programme.