气候变化领域集成服务门户(CCPortal): Molecular-level composition of dissolved organic matter in distinct trophic states in Chinese lakes: Implications for eutrophic lake management and the global carbon cycle

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DOI	10.1016/j.watres.2022.118438
	Molecular-level composition of dissolved organic matter in distinct trophic states in Chinese lakes: Implications for eutrophic lake management and the global carbon cycle
	Liu, Shasha; Hou, Junwen; Suo, Chengyu; Chen, Junyi; Liu, Xiaohui; Fu, Rui; Wu, Fengchang
发表日期	2022
ISSN	0043-1354
EISSN	1879-2448
卷号	217
英文摘要	Dissolved organic matter (DOM) is an abundant and mobile part of the aquatic environment and plays important roles in aquatic biogeochemical cycles and the global carbon cycle. Recently, eutrophication has become an important environmental issue in global lakes, but how eutrophication drives changes in the molecular composition of DOM along trophic gradients remains poorly understood. We thus characterized 67 DOM isolates from 11 lakes along a trophic gradient in China by using a combined approach including absorption spectroscopy, excitation-emission matrix fluorescence and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Our results indicated that dissolved organic carbon and absorption coefficients at 350 nm increased with increasing trophic status index. The ultraviolet absorbance at 254 nm and fluorescence intensity of all fluorescent components were higher in eutrophic lakes than in oligotrophic lakes. DOM in high trophic state lakes tended to be dominated by higher molecular weight, unsaturation degree, greater abundance of S -containing compounds, and condensed or polycyclic aromatic compounds than oligotrophic lakes. Additionally, autochthonous DOM characterized by more aliphatic compounds increased with the increasing trophic state. We concluded that nutrient input along with allochthonous DOM favors the lake eutrophication and subsequently increases the release and accumulation of autochthonous DOM. Consequently, eutrophication modifies the structure of the organic matter into more complex materials with increased input of allochthonous DOM and increased release of autochthonous DOM, which could accelerate global carbon cycle processes. Our results here have potential to contribute significantly to future studies of DOM dynamics in eutrophic lakes.
英文关键词	Dissolved organic matter; Trophic state; Optical properties; Fourier-transform ion cyclotron resonance; mass spectrometry; Chinese Lakes
语种	英语
WOS研究方向	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000793831800005
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/281057
作者单位	University of Science & Technology Beijing; Chinese Research Academy of Environmental Sciences
推荐引用方式 GB/T 7714	Liu, Shasha,Hou, Junwen,Suo, Chengyu,et al. Molecular-level composition of dissolved organic matter in distinct trophic states in Chinese lakes: Implications for eutrophic lake management and the global carbon cycle[J],2022,217.
APA	Liu, Shasha.,Hou, Junwen.,Suo, Chengyu.,Chen, Junyi.,Liu, Xiaohui.,...&Wu, Fengchang.(2022).Molecular-level composition of dissolved organic matter in distinct trophic states in Chinese lakes: Implications for eutrophic lake management and the global carbon cycle.WATER RESEARCH,217.
MLA	Liu, Shasha,et al."Molecular-level composition of dissolved organic matter in distinct trophic states in Chinese lakes: Implications for eutrophic lake management and the global carbon cycle".WATER RESEARCH 217(2022).