Composition of dissolved organic matter (DOM) from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis, infrared spectroscopy, pyrolysis-GC-MS and thermally assisted hydrolysis and methylation

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	Composition of dissolved organic matter (DOM) from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis, infrared spectroscopy, pyrolysis-GC-MS and thermally assisted hydrolysis and methylation
	Jiang, Tao 1,2; Kaal, Joeri 3,4; Liang, Jian 1; Zhang, Yaoling 5; Wei, Shiqiang 1; Wang, Dingyong 1; Green, Nelson W.6
	2017-12-15
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
卷号	603 页码:461-471
关键词	Soil Dissolved Organic Matter Water-soluble Organic Matter Three Gorges Reservoir Characterization Natural Organic Matter
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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6239
专题	青海盐湖研究所知识仓储
作者单位	1.Southwest Univ, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Chongqing Key Lab Agr Resources & Environm, Coll Resources & Environm,Minist Educ, Chongqing 400716, Peoples R China 2.Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden 3.Univ Santiago de Compostela, Dept Edafol & Quim Agr, Ciencia Sistema Terra, Campus Sur S-N, Santiago De Compostela 15782, Spain 4.CSIC, Inst Ciencias Patrimonio Incipit, Avda Vigo SN, Santiago De Compostela 15705, Spain 5.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Qinghai, Peoples R China 6.Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
推荐引用方式 GB/T 7714	Jiang, Tao,Kaal, Joeri,Liang, Jian,et al. Composition of dissolved organic matter (DOM) from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis, infrared spectroscopy, pyrolysis-GC-MS and thermally assisted hydrolysis and methylation[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).Composition of dissolved organic matter (DOM) from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis, infrared spectroscopy, pyrolysis-GC-MS and thermally assisted hydrolysis and methylation.SCIENCE OF THE TOTAL ENVIRONMENT,603,461-471.
MLA	Jiang, Tao,et al."Composition of dissolved organic matter (DOM) from periodically submerged soils in the Three Gorges Reservoir areas as determined by elemental and optical analysis, infrared spectroscopy, pyrolysis-GC-MS and thermally assisted hydrolysis and methylation".SCIENCE OF THE TOTAL ENVIRONMENT 603(2017):461-471.