Spectroscopic indices trace spatiotemporal variability of dissolved organic matter in a river system with Karst characteristic

doi:10.1016/j.jhydrol.2020.125570

	Spectroscopic indices trace spatiotemporal variability of dissolved organic matter in a river system with Karst characteristic
	Ni, Maofei 2,3,4; Jiang, Shaohua 1; Li, Siyue 3
刊名	JOURNAL OF HYDROLOGY
	2020-11-01
卷号	590 页码:10
关键词	Optical properties Spatiotemporal variability Transport and reactivity Yangtze (Changjiang) River continuum
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2020.125570
通讯作者	Li, Siyue(syli2006@163.com)
英文摘要	River acts as a continuum of dissolved organic matter (DOM) transport and transformation. However, underlying controls of fluvial DOM spatiotemporal variability has yet to be revealed. Here, we explored the DOM component, molecular weight and source in the Longchuan River, a headwater tributary of the Yangtze with Karst characteristic. Concentrated rainfall, severe soil erosion and in-situ metabolism primarily controlled DOM component and molecular weight in the Karst river, resulting in accumulation of recalcitrant (high molecular weight) DOMs from tributaries to the main stem in the post-wet period. We found a robust relationship between DOM absorption coefficients (a(280) and a(350)) and dissolved organic carbon (DOC) concentrations from a multiple linear regression model: [DOC] = 0.098a(285) + 0.591a(350) + 1.337 (R-2 = 0.83, p < 0.001). High fluorescence index (FI) values (> 1.9) indicated a dominant origin of autochthonous DOM. Biological index (BIX) values exhibited an increasing trend along the flow direction, suggesting a large amount of recently produced DOM from phytoplankton downstream. Our findings demonstrated that both allochthonous and autochthonous inputs regulated DOM dynamics in a river continuum with Karst characteristic, highlighting spatiotemporal variability of DOM response to River Continuum Concept (RCC).
资助项目	National Natural Science Foundation of China[31670473]
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000599754500251
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/12685]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Li, Siyue
作者单位	1.Weifang Vocat Coll, Weifang 262737, Peoples R China 2.Guizhou Minzu Univ, Coll Ecoenvironm Engn, Guiyang 550025, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecohydrol, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ni, Maofei,Jiang, Shaohua,Li, Siyue. Spectroscopic indices trace spatiotemporal variability of dissolved organic matter in a river system with Karst characteristic[J]. JOURNAL OF HYDROLOGY,2020,590:10.
APA	Ni, Maofei,Jiang, Shaohua,&Li, Siyue.(2020).Spectroscopic indices trace spatiotemporal variability of dissolved organic matter in a river system with Karst characteristic.JOURNAL OF HYDROLOGY,590,10.
MLA	Ni, Maofei,et al."Spectroscopic indices trace spatiotemporal variability of dissolved organic matter in a river system with Karst characteristic".JOURNAL OF HYDROLOGY 590(2020):10.