文献类型：期刊文献

英文题名：Methane Emissions from Surface of Mangrove River on Hainan Island, China

作者：Hu, Ji[1,2,3] Guan, Wei[4] Chen, Huai[1,2]

第一作者：Hu, Ji

通信作者：Chen, H[1];Chen, H[2]

机构：[1]Chinese Acad Sci, Chengdu Inst Biol, CAS Key Lab Mt Ecol Restorat & Bioresource Utiliz, Chengdu 610041, Peoples R China;[2]Chinese Acad Sci, Chengdu Inst Biol, Ecol Restorat & Biodivers Conservat Key Lab Sichu, Chengdu 610041, Peoples R China;[3]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[4]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

年份：2021

卷号：12

期号：9

外文期刊名：ATMOSPHERE

收录：;EI(收录号：20213710880850);Scopus(收录号：2-s2.0-85114507852);WOS:【SCI-EXPANDED(收录号:WOS:000699442200001)】；

基金：This research was funded by National Natural Science Foundation Item, grant number 31570480.

语种：英文

外文关键词：methane emissions; coastal river; mangrove; water surface flux; salinity

摘要：The surfaces of rivers are considered important sources of atmospheric methane (CH4), however research on this topic is still constrained, especially in freshwater rivers and with the consideration of spatial heterogeneity. Three regions (upper reaches, midstream and downstream) were selected to examine the CH4 fluxes from a freshwater river surface in a mangrove forest wetland from 2012 to 2013, using floating chambers. Results showed that the CH4 fluxes varied significantly among the three regions, with the lowest fluxes at downstream (0.50 +/- 0.20 mg m(-2) h(-1)), and highest at upper reaches (1.19 +/- 0.36 mg m(-2) h(-1)). The average emission rate at midstream was 0.95 +/- 0.37 mg m(-2) h(-1). The methane flux also varied with seasons, with higher flux in rain-abundant seasons. On average, the CH4 flux in our research river was 0.88 +/- 0.31 mg m(-2) h(-1), which was less than other tropical rivers. In addition, we found that the CH4 flux was significantly correlated with the water characteristics of temperature and atmospheric pressure. Thereby, this study quantified the methane emission from a freshwater river surface in a tropical mangrove forest, enriching the existing knowledge of river surface CH4 flux.