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DOI	10.1016/j.scitotenv.2023.161612
	Origin, composition, and accumulation of dissolved organic matter in a hypersaline lake of the Qinghai-Tibet Plateau
	Zhang, Yaoling; Yang, Keli; Chen, Hongmei; Dong, Yaping; Li, Wu
发表日期	2023
ISSN	0048-9697
EISSN	1879-1026
卷号	868
英文摘要	Inland saline lakes are widely distributed and commonly exist in arid and semi-arid regions. Dissolved organic matter (DOM) in saline lakes plays an important role in the global carbon cycle and isa key regulator of saline lake ecosystem functions through biotic and abiotic processes. However, the origin, composition, and cycling of DOM in saline lakes, especially hypersaline lakes, remain largely unknown. In this study, two lake brine DOM samples and three input river DOM samples from a hypersaline lake, Da Qaidam Lake (DQL) in the Qaidam Basin of the Qinghai-Tibet Plateau (QTP), were isolated and analyzed using a multi-analytical approach. The results indicated that, although terrestrial in origin, the DOM composition and features of DQL were dominated by indigenous in-lake processes owing to the very long water residence time of the lake brine. Lake DOM contained more aliphatic compounds but fewer aromatic compounds than DOM from the rivers. Lake DOM also exhibited more chemodiversity and contained highly saturated and oxidized components that were incorporated with heteroatoms. Despite the limited contributions from riverine DOM, some special features of lake DOM, such as the high content of sulfur-bearing components, may be partly related to the long-term accumulation of hotspring riverine input. Flocculation, photodegradation, microbial degradation, evapo-concentration, and primary production processes were considered synergistic factors in the persistence and fea-tures of the hypersaline lake DOM. The results of this study can further our knowledge of the transformation and long-term turnover of DOM in hypersaline lakes and how DOM chemodiversity changes across wide aquatic ecosystems.
关键词	Dissolved organic matter (DOM)Hypersaline lake The Qaidam Basin 13C NMR FT-ICR-MS
英文关键词	GREAT-SALT-LAKE; DA QAIDAM LAKE; FT-ICR-MS; MASS-SPECTROMETRY; MOLECULAR CHARACTERIZATION; SEASONAL-VARIATION; NMR-SPECTROSCOPY; FRESH-WATER; CARBON; MERCURY
WOS研究方向	Environmental Sciences
WOS记录号	WOS:000921077200001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283208
作者单位	Chinese Academy of Sciences; Qinghai Institute of Salt Lakes, CAS; Xiamen University
推荐引用方式 GB/T 7714	Zhang, Yaoling,Yang, Keli,Chen, Hongmei,et al. Origin, composition, and accumulation of dissolved organic matter in a hypersaline lake of the Qinghai-Tibet Plateau[J],2023,868.
APA	Zhang, Yaoling,Yang, Keli,Chen, Hongmei,Dong, Yaping,&Li, Wu.(2023).Origin, composition, and accumulation of dissolved organic matter in a hypersaline lake of the Qinghai-Tibet Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,868.
MLA	Zhang, Yaoling,et al."Origin, composition, and accumulation of dissolved organic matter in a hypersaline lake of the Qinghai-Tibet Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 868(2023).