干旱区生态环境知识资源中心(Arid): Drivers of spatial and seasonal variations of CO2 and CH4 fluxes at the sediment water interface in a shallow eutrophic lake

Arid

DOI	10.1016/j.watres.2022.118916
	Drivers of spatial and seasonal variations of CO2 and CH4 fluxes at the sediment water interface in a shallow eutrophic lake
	Sun, Heyang; Yu, Ruihong; Liu, Xinyu; Cao, Zhengxu; Li, Xiangwei; Zhang, Zhuangzhuang; Wang, Jun; Zhuang, Shuai; Ge, Zheng; Zhang, Linxiang; Sun, Liangqi; Lorke, Andreas; Yang, Jie; Lu, Changwei; Lu, Xixi
通讯作者	Yu, RH ; Lu, XX
来源期刊	WATER RESEARCH
ISSN	0043-1354
EISSN	1879-2448
出版年	2022
卷号	222
英文摘要	Shallow eutrophic lakes contribute disproportional to the emissions of CO2 and CH4 from inland waters. The processes that contribute to these fluxes, their environmental controls, and anthropogenic influences, however, are poorly constrained. Here, we studied the spatial variability and seasonal dynamics of CO2 and CH4 fluxes across the sediment-water interface, and their relationships to porewater nutrient concentrations in Lake Ulansuhai, a shallow eutrophic lake located in a semi-arid region in Northern China. The mean concentrations of CO2 and CH4 in porewater were 877.8 +/- 31.0 mu mol L-1 and 689.2 +/- 45.0 mu mol L-1, which were more than 50 and 20 times higher than those in the water column, respectively. The sediment was always a source of both gases for the water column. Porewater CO2 and CH4 concentrations and diffusive fluxes across the sediment -water interface showed significant temporal and spatial variations with mean diffusive fluxes of 887.3 +/- 124.7 mu mol m- 2 d-1 and 607.1 +/- 68.0 mu mol m- 2 d-1 for CO2 and CH4, respectively. The temporal and spatial variations of CO2 and CH4 concentrations in porewater were associated with corresponding variations in dissolved organic carbon and dissolved nitrogen species. Temperature and dissolved organic carbon in surface porewater were the most important drivers of temporal variations in diffusive fluxes, whereas dissolved organic carbon and nitrogen were the main drivers of their spatial variations. Diffusive fluxes generally increased with increasing dissolved organic carbon and nitrogen in the porewater from the inflow to the outflow region of the lake. The estimated fluxes of both gases at the sediment-water interface were one order of magnitude lower than the emissions at the water surface, which were measured in a companion study. This indicates that diffusive fluxes across the sediment-water interface were not the main pathway for CO2 and CH4 emissions to the atmosphere. To improve the mechanistic understanding and predictability of greenhouse gas emissions from shallow lakes, future studies should aim to close the apparent gap in the CO2 and CH4 budget by combining improved flux measurement techniques with process-based modeling.
英文关键词	Eutrophication Lake Ulansuhai Sediment-water interface Greenhouse gases Diffusive fluxes
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000879233100007
WOS关键词	CARBON-DIOXIDE ; METHANE EMISSIONS ; COMMUNITY STRUCTURE ; GAS-EXCHANGE ; TEMPERATURE ; NITROGEN ; DYNAMICS ; RATES ; PONDS ; VARIABILITY
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394880
推荐引用方式 GB/T 7714	Sun, Heyang,Yu, Ruihong,Liu, Xinyu,et al. Drivers of spatial and seasonal variations of CO2 and CH4 fluxes at the sediment water interface in a shallow eutrophic lake[J],2022,222.
APA	Sun, Heyang.,Yu, Ruihong.,Liu, Xinyu.,Cao, Zhengxu.,Li, Xiangwei.,...&Lu, Xixi.(2022).Drivers of spatial and seasonal variations of CO2 and CH4 fluxes at the sediment water interface in a shallow eutrophic lake.WATER RESEARCH,222.
MLA	Sun, Heyang,et al."Drivers of spatial and seasonal variations of CO2 and CH4 fluxes at the sediment water interface in a shallow eutrophic lake".WATER RESEARCH 222(2022).