Spatial and Temporal Variability of Nitrous Oxide Emissions from a Large Subtropical Reservoir in Eastern China
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Zhejiang Academy of Forestry, Hangzhou, Zhejiang Province
Le Yang   

Zhejiang Academy of Forestry, No. 399, Road Liuhe, District Xihu, Hangzhou, Zhejiang Province, 310023 Hangzhou, China
Submission date: 2018-06-12
Acceptance date: 2018-08-17
Online publication date: 2019-05-01
Publication date: 2019-05-28
Pol. J. Environ. Stud. 2019;28(5):3497–3503
Carbonaceous greenhouse gases (i.e., CO2, CH4) have often reported to be emitted from the surfaces of reservoirs, while other non-carbonaceous greenhouse gases are not available to many reservoirs. In this study, the spatiotemporal variability of N2O emissions from Xin’anjiang Reservoir was investigated at the different regions over a 13-month period using the method of the static floating chambers combined with gas chromatography. Results showed that the average N2O emission flux was the highest in the downstream river (220.24±153.68 μg m-2·s-1), followed by the upstream river (49.85±48.55 μg m-2·s-1). The reservoir’s main body had the lowest flux (26.61-39.07 μg m-2·s-1). Seasonal variability indicated that the average N2O emission fluxes before the dam reached their maximum in March, which was likely influenced by the disappearance of thermal stratification then, caused a short N2O flux peak at the waterair interface. A thorough investigation should be carried out at the different reservoir regions for a longterm basis to discover the spatiotemporal variability in N2O emission flux in a hydroelectric reservoir system, which could avoid the error of estimating the N2O emissions incorrectly.