DOM from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis

doi:10.1016/j.scitotenv.2017.06.114

CORC > 青海盐湖研究所 > 中国科学院青海盐湖研究所 > 盐湖资源与化学实验室

	DOM from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis
	Jiang, Tao; Kaal, Joeri; Liang, Jian; Zhang, Yaoling; Wei, Shiqiang; Wang, Dingyong; Green, Nelson W.
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2017-12-15
卷号	603 页码:461-471
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2017.06.114
英文摘要	Soil-derived dissolved organic matter (DOM) has a major influence in biogeochemical processes related to contaminant dynamics and greenhouse gas emissions, due to its reactivity and its bridging role between the soil and aquatic systems. Within the Three Gorges Reservoir (TGR, China) area, an extensive water-fluctuation zone periodically submerges the surrounding soils. Here we report a characterization study of soil-derived DOM across the TGR areas, using elemental and optical analysis, infrared spectroscopy (FTIR), pyrolysis-GC-MS (Py-GC-MS) and thermally assisted hydrolysis and methylation (THM-GC-MS). The results showed that the soil DOM from the TGR area is a mixture of allochthonous (i.e., plant-derived/terrigenous) and autochthonous (i.e., microbial) origins. The terrigenous DOM is composed primarily of phenolic and aliphatic structures from lignin and aliphatic biopolymers (i.e. cutin, suberin), respectively. Multivariate statistics differentiated between two fractions of the microbial DOM, i.e. chitin-derived, perhaps from fungi and arthropods in soil, and protein-derived, partially sourced from algal or aquatic organisms. Molecular proxies of source and degradation state were in good agreement with optical parameters such as SUVA(254), the fluorescence index (FI) and the humification index (HIX). The combined use of elemental analysis, fluorescence spectroscopy, and Py-GC-MS provides rigorous and detailed DOM characterization, whereas THM-GC-MS is useful for more precise but qualitative identification of the different phenolic (cinnamyl, p-hydroxyphenyl, guaiacyl, syringyl and tannin-derived) and aliphatic materials. With the multi-methodological approach used in this study, FTIR was the least informative, in part, because of the interference of inorganic matter in the soil DOM samples. The soil DOM from the TGR's water fluctuation zone exhibited considerable compositional diversity, mainly related to the balance between DOM source (microbial- or plant-derived), local vegetation and anthropogenic activities (e.g., agriculture). Finally, the relationship between DOM composition and its potential reactivity with substances of environmental concerns in the TGR area are also discussed. (C) 2017 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.isl.ac.cn/handle/363002/34546]
专题	青海盐湖研究所_盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Jiang, Tao,Kaal, Joeri,Liang, Jian,et al. DOM from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,603:461-471.
APA	Jiang, Tao.,Kaal, Joeri.,Liang, Jian.,Zhang, Yaoling.,Wei, Shiqiang.,...&Green, Nelson W..(2017).DOM from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis.SCIENCE OF THE TOTAL ENVIRONMENT,603,461-471.
MLA	Jiang, Tao,et al."DOM from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis".SCIENCE OF THE TOTAL ENVIRONMENT 603(2017):461-471.