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Spatiotemporal distribution of nitrous oxide (N2O) emissions from cascade reservoirs in Lancang-Mekong River Yunnan section, Southwestern China
River Research and Applications ( IF 2.2 ) Pub Date : 2020-09-22 , DOI: 10.1002/rra.3726 Wei Wu 1 , Jiawei Wang 1 , Xiaode Zhou 1 , Bo Yuan 1 , Mengjing Guo 1 , Lei Ren 1
River Research and Applications ( IF 2.2 ) Pub Date : 2020-09-22 , DOI: 10.1002/rra.3726 Wei Wu 1 , Jiawei Wang 1 , Xiaode Zhou 1 , Bo Yuan 1 , Mengjing Guo 1 , Lei Ren 1
Affiliation
The current issue of river damming causing the release of greenhouse gas nitrous oxide (N2O) from reservoirs has led to a debate over whether hydropower can still provide clean energy. In January (dry season) and August 2019 (wet season), we detected the N2O concentrations from cascade reservoirs in Lancang-Mekong River Yunnan section by using static headspace gas chromatography and estimated the emission flux by the boundary layer approach to explore the influencing factors, especially the impact of cascade reservoirs development and operation. In the Lancang River (Yunnan section), the longitudinal distribution of N2O concentration along the cascade reservoirs showed seasonal differences. The average concentrations of N2O during the dry season and the wet season were 13.50 ± 2.00 nmol/L and 16.40 ± 4.10 nmol/L, respectively. The reservoirs with thermal stratification in both seasons were the Xiaowan (XW), Nuozhadu (NZD), and Jinghong (JH) reservoirs. The vertical distribution of N2O concentration was depth dependent (i.e., the deeper the location, the higher the concentration) in reservoirs with thermal stratification and uniform in reservoirs without thermal stratification. Dissolved oxygen (DO), water temperature, and other biogenic elements were the main factors affecting N2O distribution. The average N2O emission flux in the cascade reservoirs was 12.80 ± 2.60 μmol m2·day−1 during the dry season and 16.10 ± 4.75 μmol m2·day−1 during the wet season. The annual average N2O emission fluxes of all reservoirs were in an order of JH > XW > Dachaoshan (DCS) > NZD > Miaowei (MW) > Gongguoqiao (GGQ) > Manwan (Man W). In 2019, a total of 3.37 × 106 mol year−1 (94.39 ton N2O-N year−1) was released from the water surface of the cascade reservoirs, which accounted for approximately 0.31% of the total N2O emissions from reservoirs worldwide. This study shows the cascade reservoirs development and operations have made the Lancang River (Yunnan section) a major area for N2O emissions.
更新日期：2020-09-22
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