Fluxes of dissolved methane and nitrous oxide in the tidal cycle in a mangrove in South China
Jian Liu
A B C , Liyang Zhan B , Wangwang Ye B , Jianwen Wen B , Guangcheng Chen C D , Yuhong Li B and Liqi Chen A B E
+ Author Affiliations
- Author Affiliations
A College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China.
B Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361000, China.
C Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361000, China.
D Observation and Research Station of Coastal Wetland Ecosystem in Beibu Gulf, Ministry of Natural Resources, Beihai 536000, China.
E Corresponding author. Email: chenliqi@tio.org.cn
Environmental Chemistry 18(6) 261-273 https://doi.org/10.1071/EN21090
Submitted: 29 June 2021 Accepted: 6 October 2021 Published: 5 November 2021
Environmental context. Methane and nitrous oxide play a significant role in climate change, while the variation in fluxes in mangrove-dominated coastal wetlands is a key uncertainty in the production of these gases. Field studies measuring the fluxes of these gases in a specific coastal mangrove were conducted and revealed complex seasonal behaviors. Methane emissions to the atmosphere were significant, while nitrous oxide emissions were less so, but are likely to increase where nutrient levels increase.
Abstract. Mangroves are carbon sinks that are believed to contribute to carbon neutrality; however, they are also considered to be partly offset by their emissions of methane (CH4) and nitrous oxide (N2O). In this study, dissolved CH4, N2O and other hydrological parameters over the tidal cycle in the Golden Bay mangrove (GBM), Beihai, Guangxi, are investigated during the dry season and wet season. The concentration and flux of dissolved N2O and CH4 in the GBM have distinct seasonal variations under the influence of the tidal cycle, and the concentration and flux in the dry season were higher than those in the wet season, with GBM as a weak source of N2O and a strong source of CH4. The fluxes of N2O and CH4 were 119 ± 370 μmol m−2 yr−1 and 87.2 ± 48.6 mmol m−2 yr−1 respectively during tidal coverage. The emission of CH4 through the water–atmosphere interface offsets 22.5 % of the total carbon sequestration of GBM. Owing to the potential increase in N2O emissions caused by possible exogenous nitrogen input and the transport of dissolved CH4 from mangroves to coastal water, uncertainty remains in assessing the capacity of blue carbon sinks in mangroves.
Keywords: nitrous oxide, methane, fluxes, mangroves, tidal cycle, Beihai.
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