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| Nitrous oxide fluxes and its influencing factors in the shrimp ponds of the Jiulong River estuary |
| Received:March 03, 2021 |
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| KeyWord:nitrous oxide;water-air interface;coastal aquaculture;Jiulong River estuary |
| Author Name | Affiliation | E-mail | | JIN Baoshi | College of Resources and Environment Science, Anqing Normal University, Anqing 246011, China
School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China | jinbsh@aqnu.edu.cn | | XIE Jianguo | College of Resources and Environment Science, Anqing Normal University, Anqing 246011, China | | | YAN Hongyuan | College of Resources and Environment Science, Anqing Normal University, Anqing 246011, China | | | YANG Ping | School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China | | | ZENG Congsheng | School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China | |
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| Abstract: |
| Aquaculture ponds are rich in nutrients due to a large amount of organic food, and hence are a potential source of nitrous oxide (N2O). The total area and increasing rate of coastal aquaculture in China are the highest in the world, and the emission of N2O from the aquaculture ecosystem has attracted increasing attention. To investigate the characteristics and impact of N2O emissions from a coastal aquaculture ecosystem, the diurnal variations of N2O fluxes at the water-air interface of shrimp ponds in the Jiulong River estuary of Fujian Province were measured using the floating chamber-gas chromatography, on June 18, August 18, and October 10, 2015. The meteorological parameters and water environment factors and their impacts on the N2O emission fluxes were also recorded and analyzed. The results showed that the range and mean value of N2O fluxes at the water-air interface from the shrimp pond were 0.10~0.64 μmol·m-2·h-1 and (0.26±0.07) μmol·m-2·h-1, respectively. The shrimp pond acted as a source for atmospheric N2O and the emission fluxes increased with the aquaculture period and had diurnal variation. Correlation analysis showed that the N2O fluxes at the water-air interface were significantly negatively correlated with salinity and positively correlated with the water temperature, soluble organic carbon, ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen content. Multivariate regression analysis showed that water salinity and nitrate nitrogen contents had significant effects on N2O emission fluxes of shrimp ponds. |
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