N2O release from the water bodies of typical gate controlling tributaries of Bohai Bay
LI Xiao-zheng1, YUE Fu-jun1,2, ZHOU Bin3, WANG Xin-chu1, HU Jian4, CHEN Sai-nan1, LI Si-liang1,2
1. School of Earth System Science, Tianjin University, Tianjin 300072, China; 3. Tianjin Key Laboratory of Earth's Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin 300072, China; 2. Tianjin Academy of Environmental Protection Sciences, Tianjin 300191, China; 4. Research Center for Ecology and Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Abstract:To explore the spatiotemporal variation in N2O in typical coastal zone and its main controlling factors under weak hydrodynamic conditions, water samples were collected from coastal rivers and wetlands (Daqing River-Duliujian River-Beidagang wetland) in July and August (Summer) and November (the beginning of Winter) in 2019. The results show that the concentration of N2O varied between 0.4~184.5nmol/L. The saturation of N2O ranged from 7.2%~2740%, and 90% of the samples were oversaturated, indicating that the study area was a potential source of N2O. The N2O release flux at the water-gas interface ranged from -0.3~6.7μmol/(m2·h), while the N2O exchange flux in summer was higher than that in winter. The study also found that the N2O concentration fluctuated significantly before and after rainfall, and the variation in N2O ranged from -15.2~63.9nmol/L at same sites before and after rainfall. The average increase in N2O concentration was significantly higher in the upper reaches (22.1nmol/L) than in the downstream (1.3nmol/L), indicating that rainfall drove the transportation of nitrogen species and accelerated N2O release. The salinity and NO3--N concentration had significant effect on N2O concentration. The N2O emission factor of the tributaties under the weak hydrodynamic conditions in coastal zone was estimated to be 0.0073, higher than the default value of 0.0026 defined by IPCC. Therefore, the N2O budget in the coastal zone may underestimate the indirect N2O emissions by using the IPCC threshold value.
李肖正, 岳甫均, 周滨, 王欣楚, 胡健, 陈赛男, 李思亮. 渤海湾典型闸控入海河流水体N2O释放研究[J]. 中国环境科学, 2022, 42(1): 356-366.
LI Xiao-zheng, YUE Fu-jun, ZHOU Bin, WANG Xin-chu, HU Jian, CHEN Sai-nan, LI Si-liang. N2O release from the water bodies of typical gate controlling tributaries of Bohai Bay. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 356-366.
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