气候变化领域集成服务门户(CCPortal): Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake)

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DOI	10.1016/j.watres.2024.121154
	Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake)
	Xu, Lei; Hu, Qian; Liu, Zetian; Jian, Minfei; Peng, Yansong; Shen, Ruichang; Liao, Wei; Zhong, Aiwen
发表日期	2024
ISSN	0043-1354
EISSN	1879-2448
起始页码	251
卷号	251
英文摘要	As the largest reactive organic carbon pool, dissolved organic matter (DOM) plays an important role in various biogeochemical processes in lake ecosystems. Recently, climate change-induced extreme events (e.g., floods and droughts) have significantly modified the hydrological patterns of lakes worldwide, and regulated the quality and quantity of DOM. However, the responses of DOM chemistry to hydrological alteration in lakes remain poorly understood. Here we investigated the influences of hydrological alteration on sources, composition, and characteristics of DOM in Poyang Lake, the largest freshwater lake in China, using a combination of bulk chemical, optical and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) techniques. Results show various sources of DOM (autochthonous, allochthonous, and anthropogenic inputs) and significant variations in DOM chemistry across four hydrological periods (the retreating, dry, rising, and flooding periods) in Poyang Lake. During the retreating, rising, and flooding periods, DOM was characterized by higher aromaticity, humification degree, and recalcitrance, and exhibited pronounced allochthonous signatures. In contrast, DOM contained more S-containing molecules and aliphatic compounds during the dry period, displaying relatively stronger autochthonous features. Terrestrial inputs and the lignin-CHOS formation process are likely the primary underlying mechanisms shaping the differences in DOM chemistry in Poyang Lake. Our research demonstrates the significant impacts of hydrological alteration on DOM dynamics, and provides an improved understanding of DOM biogeochemical cycles and carbon cycling in large aquatic systems under global climate change.
英文关键词	Hydrological alteration; Dissolved organic matter; FT-ICR MS; Optical properties; Poyang Lake
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:001170445000001
来源期刊	WATER RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/288594
作者单位	Chinese Academy of Sciences; Jiangxi Normal University; Nanchang University; Nanchang University
推荐引用方式 GB/T 7714	Xu, Lei,Hu, Qian,Liu, Zetian,et al. Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake)[J],2024,251.
APA	Xu, Lei.,Hu, Qian.,Liu, Zetian.,Jian, Minfei.,Peng, Yansong.,...&Zhong, Aiwen.(2024).Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake).WATER RESEARCH,251.
MLA	Xu, Lei,et al."Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake)".WATER RESEARCH 251(2024).