气候变化领域集成服务门户(CCPortal): Different dissolved organic matter composition between central and southern glaciers on the Tibetan Plateau

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DOI	10.1016/j.ecolind.2022.108888
	Different dissolved organic matter composition between central and southern glaciers on the Tibetan Plateau
	Guo, Bixi; Liu, Yongqin; Liu, Keshao; Shi, Quan; He, Chen; Cai, Ruanhong; Jiao, Nianzhi
通讯作者	Liu, YQ (通讯作者)
发表日期	2022
ISSN	1470-160X
EISSN	1872-7034
卷号	139
英文摘要	A large amount of dissolved organic matter (DOM) is stored in glacier ecosystems, which is crucial for downstream oligotrophic aquatic ecosystems during glacier melting. However, knowledge about their spatial differences in glacier ecosystems on the Tibetan Plateau (TP) is limited. We qualitatively and quantitatively analyzed the DOM in snow, ice, cryoconite, and glacier-fed streams in five glaciers in the central and southern TP using ultra-high-resolution mass spectrometry. Our results revealed that there were no significant differences in DOM concentrations or composition between the central and southern TP glaciers in snow and ice samples. However, the southern cryoconite contained significantly higher relative intensities of carbohydrate-, lignin-, tannin-, and condensed aromatic-like compounds and lower intensities of lipid-like compounds than the central cryoconite. In addition, the DOM molecules sustained in the cryoconite of the southern glacier were predominantly classified as condensed aromatic-like compounds, whereas those of the central TP glaciers were classified as lignin-like compounds. Except different terrestrial input, the network analysis and backward trajectory revealed that different bacterial composition and anthropogenic inputs caused this difference. Higher forest cover leaded to higher relative intensities of lignin- and tannin- DOM in the southern cryoconite than the central cryoconite. Sixty-six operational taxonomic units (OTUs) were associated with the degradation of lipid-, proteins/amino sugar- and lignin-like components which showed significantly higher relative abundance in the southern cryoconite than the central cryoconite. More anthropogenic inputs brought by the India monsoon affect the carbohydrate- and condensed aromatic-like compounds in the southern cryoconite. DOM exported into glacial streams of the central TP glaciers was dominated by tannin- and condensed aromatic-like compounds, whereas more labile components were discharged from the southern TP glacier. Our study provides new insights on the glacier DOM composition in and exported from different glaciers in the face of changing climate.
关键词	MOLECULAR CHARACTERIZATION BLACK CARBON FLUORESCENCE SPECTROSCOPY GREENLAND WATER CRYOCONITE INSIGHTS DYNAMICS ANCIENT EXPORT
英文关键词	Glacier dissolved organic matter; Molecular characteristics; Anthropogenic effects; Bacteria; Climate change
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS记录号	WOS:000803573600001
来源期刊	ECOLOGICAL INDICATORS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260659
推荐引用方式 GB/T 7714	Guo, Bixi,Liu, Yongqin,Liu, Keshao,et al. Different dissolved organic matter composition between central and southern glaciers on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2022,139.
APA	Guo, Bixi.,Liu, Yongqin.,Liu, Keshao.,Shi, Quan.,He, Chen.,...&Jiao, Nianzhi.(2022).Different dissolved organic matter composition between central and southern glaciers on the Tibetan Plateau.ECOLOGICAL INDICATORS,139.
MLA	Guo, Bixi,et al."Different dissolved organic matter composition between central and southern glaciers on the Tibetan Plateau".ECOLOGICAL INDICATORS 139(2022).