干旱区生态环境知识资源中心(Arid): Fluxes in CO2 and CH4 and influencing factors at the sediment-water interface in a eutrophic saline lake

Arid

DOI	10.1016/j.jenvman.2023.118314
	Fluxes in CO2 and CH4 and influencing factors at the sediment-water interface in a eutrophic saline lake
	Li, Xiangwei; Yu, Ruihong; Wang, Jun; Sun, Heyang; Lu, Changwei; Liu, Xinyu; Ren, Xiaohui; Zhuang, Shuai; Guo, Zhiwei; Lu, Xixi
通讯作者	Yu, RH
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2023
卷号	344
英文摘要	Although saline aquatic ecosystems are significant emitters of greenhouse gases (GHGs), dynamic changes in GHGs at the sediment-water interface remain unclear. The present investigation carried out a total of four sampling campaigns in Daihai Lake, which is a eutrophic saline lake situated in a semi-arid area of northern China. The aim of this study was to investigate the spatio-temporal dynamics of carbon dioxide (CO2) and methane (CH4) fluxes at the sediment-water interface and the influencing factors. The mean concentrations of porewater CO2 and CH4 were 44.98 & PLUSMN; 117.99 & mu;mol L-1 and 124.36 & PLUSMN; 97.00 & mu;mol L-1, far exceeding those in water column of 11.14 & PLUSMN; 2.16 & mu;mol L-1 and 0.33 & PLUSMN; 0.23 & mu;mol L-1, respectively. The CO2 and CH4 fluxes at the sediment-water interface (FS-WCO2 and FS-WCH4) exhibited significant spatial and temporal variations, with mean values of 9.24 & PLUSMN; 13.84 & mu;mol m- 2 d-1 and 3.53 & PLUSMN; 4.36 & mu;mol m- 2 d-1, respectively, indicating that sediment is the source of CO2 and CH4 in the water column. However, CO2 and CH4 fluxes were much lower than those measured at the water-air interface in a companion study (17.54 & PLUSMN; 14.54 mmol m - 2d- 1and 0.50 & PLUSMN; 0.50 mmol m - 2d- 1,respectively), indicating that the diffusive flux of gases at the sediment-water interface was not the primary source of CO2 and CH4 emissions to the atmosphere. Regression and correlation analyses revealed that salinity (Sal) and nutrients were the most influential factors on porewater gas concentrations, and that gas fluxes increased with increasing gas concentrations and porosity. The microbial activity of sediment is greatly affected by nutrients and Sal. Additionally, Sal has the ability to regulate biogeochemical processes, thereby regulating GHG emissions. The present investigation addresses the research gap concerning GHG emissions from sediments of eutrophic saline lakes. The study suggests that controlling the eutrophication and salinization of lakes could be a viable strategy for reducing carbon emissions from lakes. However, further investigations are required to establish more conclusive results.
英文关键词	Eutrophication Salinity Greenhouse gas emissions Daihai lake Sediment-water interface
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001025763300001
WOS关键词	GREENHOUSE-GAS PRODUCTION ; CARBON-DIOXIDE EMISSIONS ; DAIHAI LAKE ; NUTRIENT DYNAMICS ; METHANE EMISSIONS ; OVERLYING WATER ; INNER-MONGOLIA ; TEMPERATURE ; PONDS ; GENERATION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397293
推荐引用方式 GB/T 7714	Li, Xiangwei,Yu, Ruihong,Wang, Jun,et al. Fluxes in CO2 and CH4 and influencing factors at the sediment-water interface in a eutrophic saline lake[J],2023,344.
APA	Li, Xiangwei.,Yu, Ruihong.,Wang, Jun.,Sun, Heyang.,Lu, Changwei.,...&Lu, Xixi.(2023).Fluxes in CO2 and CH4 and influencing factors at the sediment-water interface in a eutrophic saline lake.JOURNAL OF ENVIRONMENTAL MANAGEMENT,344.
MLA	Li, Xiangwei,et al."Fluxes in CO2 and CH4 and influencing factors at the sediment-water interface in a eutrophic saline lake".JOURNAL OF ENVIRONMENTAL MANAGEMENT 344(2023).