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| Temporal and spatial variations of N2O flux and their impactor factors in typical small aquaculture ponds in the Yangtze River Delta |
| Received:August 23, 2024 |
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| KeyWord:aquaculture pond;bulk diffusion model;N2O flux;temporal and spatial variation;impact factor |
| Author Name | Affiliation | E-mail | | HE Yang | NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | ZHANG Mi | NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | zhangm.80@nuist.edu.cn | | SHI Jie | NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WANG Jiao | Taiyuan Meteorological Bureau of Shanxi Province, Taiyuan 030002, China | | | XIE Yanhong | Guangxi Ecological and Environmental Monitoring Centre, Nanning 530028, China | | | JIA Lei | NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | XIAO Wei | NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | CAO Chang | NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China
School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | |
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| Abstract: |
| In this study, N2O fluxes at the water-air interface were observed by bulk diffusion model in typical small aquaculture ponds in the Yangtze River Delta from May 2017 to May 2021. The temporal and spatial variations of N2O flux and their impact factors were determined. The results showed that N2O flux had diurnal variations with maximum value in the noon or afternoon in the four seasons. The diurnal variation ranges of N2O flux were 11.20~117.28, 30.96~150.30, 3.77~22.77, 4.73~21.74 μmol ·m-2·d-1 in the four seasons, respectively. The N2O flux showed a seasonal variation. The value ranged from -0.97 to 217.83 μmol·m-2·d-1, which was high in summer and low in winter. The annual mean N2O flux was 34.86 μmol·m-2·d-1. The diurnal variations of N2O flux were affected by wind speed, air pressure, pH and oxidation-reduction potential（ORP）. The diurnal variation of N2O flux in spring was mainly controlled by air pressure, which responded to air pressure change linearly. The diurnal variation of N2O flux in summer, autumn and winter were mainly dominated by wind speed, which increased with wind speed change linearly. The seasonal variation of N2O emission flux was affected by water temperature（20 cm depth）, air temperature, air pressure, dissolved oxygen（DO）, pH and ORP. The main controlling factor was water temperature. The N2O flux increased with water temperature exponentially. The temperature sensitivity（Q10） was 2.36. Artificial management practices such as feeding, application of chicken manure, and drainage can make N2O flux increase significantly. N2O flux in the area where chicken manure was applied was approximately 1.5 times higher than that in feeding area. During the drainage period, N2O flux from drained pond was about 4 times higher than that from undrained pond. |
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