干旱区生态环境知识资源中心(Arid): Driving mechanism of water replenishment on DOM composition and eutrophic status changes of lake in arid and semi-arid regions of loess area

Arid

DOI	10.1016/j.scitotenv.2023.165609
	Driving mechanism of water replenishment on DOM composition and eutrophic status changes of lake in arid and semi-arid regions of loess area
	Lu, Kuotian; Gao, Xiaobo; Yang, Fang; Gao, Hongjie; Yan, Xin; Yu, Huibin
通讯作者	Gao, HJ ; Yu, HB
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2023
卷号	899
英文摘要	Water replenishment can be a key factor in driving lake eutrophication status. In arid and semi-arid regions of China, water replenishment for a lake has been widely carried out for not only improving water environmental quality, but also maintaining ecological system function. However, it is still unclear in terms of mechanism by which water replenishment drives lake eutrophication status. In this study, fluorescence excitation-emission matrix spectroscopy (EEMs) combined with multiple statistical analysis models (including parallel factor analysis, correlation analysis, redundancy analysis, and partial least squares structural equation modeling) was utilized to reveal potential driving mechanism and causality between water replenishment, dissolved organic matter (DOM) fractions and eutrophic status of Lake Shahu in China. Based on variations of DOM fractions, fulvic-like substances could be accumulated during the replenishment period, while nutrients carried along the replenishment might conduce to increase microbial activities during the non-replenishment period. This should be contributed to an alteration of prominent component from fulvic-like substances to tyrosine-like substances during the replenishment period to non-replenishment period. According to partial least squares structural equation modeling, two potential indirect paths were finally revealed, i.e., water replenishment derived the eutrophic status of Lake Shahu: water replenishment & RARR; microbial activity & RARR; algae & RARR; eutrophication, and water replenishment & RARR; microbial activity & RARR; eutrophication. This supposed that the water replenishment should indirectly drive the algae and eutrophication of the lake by promoting the transformation of DOM fractions. In addition, natural conditions could indirectly contribute to the eutrophication of the lake through impacting the algae growth. These findings should be conducive to trace the alteration of DOM fractions in lakes by water replenishment and in recognizing potential driving mechanisms of water replenishment on eutrophication of lakes by changing DOM fractions. This could provide basic theoretical support for policymakers to regulate and treat the eutrophication of lakes.
英文关键词	Lake eutrophication Water replenishment DOM EEM-PARAFAC Partial least squares structural equation modeling
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001050833500001
WOS关键词	DISSOLVED ORGANIC-MATTER ; PLS-SEM ; FLUORESCENCE ; PHOSPHORUS ; NITROGEN ; DECLINE ; QUALITY ; SHIFT
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/2XILL650/398544
推荐引用方式 GB/T 7714	Lu, Kuotian,Gao, Xiaobo,Yang, Fang,et al. Driving mechanism of water replenishment on DOM composition and eutrophic status changes of lake in arid and semi-arid regions of loess area[J],2023,899.
APA	Lu, Kuotian,Gao, Xiaobo,Yang, Fang,Gao, Hongjie,Yan, Xin,&Yu, Huibin.(2023).Driving mechanism of water replenishment on DOM composition and eutrophic status changes of lake in arid and semi-arid regions of loess area.SCIENCE OF THE TOTAL ENVIRONMENT,899.
MLA	Lu, Kuotian,et al."Driving mechanism of water replenishment on DOM composition and eutrophic status changes of lake in arid and semi-arid regions of loess area".SCIENCE OF THE TOTAL ENVIRONMENT 899(2023).