ORIGINAL RESEARCH
Spatial and Temporal Variability of Nitrous Oxide
Emissions from a Large Subtropical Reservoir
in Eastern China
1 | Zhejiang Academy of Forestry, Hangzhou, Zhejiang Province |
CORRESPONDING AUTHOR
Le Yang
Zhejiang Academy of Forestry, No. 399, Road Liuhe, District Xihu, Hangzhou, Zhejiang Province, 310023 Hangzhou, China
Zhejiang Academy of Forestry, No. 399, Road Liuhe, District Xihu, Hangzhou, Zhejiang Province, 310023 Hangzhou, China
Online publish date: 2019-05-01
Publish date: 2019-05-28
Submission date: 2018-06-12
Acceptance date: 2018-08-17
Pol. J. Environ. Stud. 2019;28(5):3497–3503
KEYWORDS
TOPICS
ABSTRACT
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.