干旱区生态环境知识资源中心(Arid): Deciphering dissolved organic matter characteristics and its fate in a glacier-fed desert river

Arid

DOI	10.1016/j.envres.2024.119251
	Deciphering dissolved organic matter characteristics and its fate in a glacier-fed desert river - the Tarim river, China
	Han, Yufu; Qi, Yulin; Zhong, Jun; Yi, Yuanbi; Nai, Hui; He, Ding; He, Chen; Shi, Quan; Li, Si-Liang
通讯作者	Zhong, J
来源期刊	ENVIRONMENTAL RESEARCH
ISSN	0013-9351
EISSN	1096-0953
出版年	2024
卷号	257
英文摘要	The bioavailable diverse dissolved organic matter (DOM) present in glacial meltwater significantly contributes to downstream carbon cycling in mountainous regions. However, the comprehension of molecular-level characteristics of riverine DOM, from tributary to downstream and their fate in glacier-fed desert rivers remains limited. Herein, we employed spectroscopic and high-resolution mass spectrometry techniques to study both optical and molecular-level characteristics of DOM in the Tarim River catchment, northwest China. The results revealed that the DOC values in the downstream were higher than those in the tributaries, yet they remained comparable to those found in other glacier-fed streams worldwide. Five distinct components were identified using EEMPARAFAC analysis in both tributary and downstream samples. The dominance of three protein -like components in tributary samples, contrasting with a higher presence of humic-like components in downstream samples, which implied that the dilution and alterations of the glacier DOM signature and overprinting with terrestrialderived DOM. Molecular composition revealed that thousands of compounds with higher molecular weight and increased aromaticity were transformed, generated and introduced from terrestrial inputs during downstream transportation. The twofold rise in polycyclic aromatic and polyphenolic compounds observed downstream compared to tributaries indicated a greater influx of terrestrial organic matter introduced into the downstream during water transportation. The study suggests that the glacier-sourced DOM experienced minimal photodegradations, with limited influence from human activities, while also being shaped by terrestrial inputs during its transit in the alpine-arid region. This unique scenario offers valuable insights into comprehending the fate of DOM originating from glacial meltwater in arid mountainous regions.
英文关键词	Dissolved organic matter Optical characteristics Molecular compositions Tributaries and downstream The Tarim river
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001249237000001
WOS关键词	FLUORESCENCE SPECTROSCOPY ; CARBON ; ECOSYSTEMS ; REACTIVITY ; DYNAMICS ; ANCIENT ; LINKING ; MARINE ; SULFUR ; WATERS
WOS类目	Environmental Sciences ; Public, Environmental & Occupational Health
WOS研究方向	Environmental Sciences & Ecology ; Public, Environmental & Occupational Health
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403627
推荐引用方式 GB/T 7714	Han, Yufu,Qi, Yulin,Zhong, Jun,et al. Deciphering dissolved organic matter characteristics and its fate in a glacier-fed desert river - the Tarim river, China[J],2024,257.
APA	Han, Yufu.,Qi, Yulin.,Zhong, Jun.,Yi, Yuanbi.,Nai, Hui.,...&Li, Si-Liang.(2024).Deciphering dissolved organic matter characteristics and its fate in a glacier-fed desert river - the Tarim river, China.ENVIRONMENTAL RESEARCH,257.
MLA	Han, Yufu,et al."Deciphering dissolved organic matter characteristics and its fate in a glacier-fed desert river - the Tarim river, China".ENVIRONMENTAL RESEARCH 257(2024).