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Temporal and spatial characteristics of methane flux and its influencing factors in a typical aquaculture pond |
JIA Lei1, ZHANG Mi1, PU Yi-ni1, ZHAO Jia-yu1, WANG Jiao2, XIE Yan-hong1, ZHANG Zhen1, XIAO Wei1, SHI Jie1, QIU Ji-li1 |
1. Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change, Nanjing University of Information Science &Technology, Nanjing 210044, China; 2. Taiyuan Meteorological Bureau of Shanxi Province, Taiyuan 030000, China |
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Abstract Applied the multi-channel closed dynamic floating chamber, the spatial and temporal variations of CH4 flux and its impact factors in an aquaculture pond were identified. The results showed that ebullition was the major transport pathway of CH4 emission. CH4 diffusion flux and ebullition flux had visible seasonal variation. The CH4 diffusion flux was 0.113, 0.830, 0.002 and 0.005 μmol/(m2·s) in spring, summer, autumn and winter, respectively. The ebullition flux was 0.923, 1.789, 0.006 and 0.007μmol/(m2·s) in spring, summer, autumn and winter, respectively. The ratio of the ebullition flux to the total flux was 89.04%、68.29%、78.95% and 60.52% respectively in the four seasons. The total CH4 flux also exhibited spatial variations within the pond. In winter and spring, artificial managements were not performed. The total CH4 flux increased with increase of offshore distance. The total CH4 flux was 34.7 and 2.98 times higher in the middle area of the pond than that in the shallow water area close to bank in winter and spring, respectively. But, during breeding period in summer, the spatial pattern of CH4 flux was related to artificial managements. The total CH4 flux showed the following sequence: artificial feeding zone (7.371μmol/(m2·s))>natural growth zone (2.151μmol/(m2·s)) >artificial oxygenation zone (0.888μmol/(m2·s)) > shallow water zone along the shore (0.206μmol/(m2·s)). At the half hourly scale, CH4 diffusion flux positively correlated with water temperature and negatively correlated with wind speed significantly in spring. In autumn, CH4 diffusion flux positively correlated with water temperature and wind speed.CH4 ebullition flux positively correlated with water temperature significantly. At the daily scale, water temperature was the main impacting factor of CH4 diffusion flux and ebullition flux. Both of the fluxes increased exponentially with the increase of water temperature. The water temperature sensitivity(Q10) of ebullition flux was higher than that of diffusive flux. The Q10 was 12.72 and 7.78, respectively.
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Received: 29 October 2020
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