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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, Tao1,2; Kaal, Joeri3,4; Liang, Jian1; Zhang, Yaoling5; Wei, Shiqiang1; Wang, Dingyong1; Green, Nelson W.6
2017-12-15
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
卷号603页码:461-471
文章类型Article
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.
关键词Soil Dissolved Organic Matter Water-soluble Organic Matter Three Gorges Reservoir Characterization Natural Organic Matter
WOS标题词Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]TETRAMETHYLAMMONIUM HYDROXIDE THERMOCHEMOLYSIS ; GAS CHROMATOGRAPHY/MASS SPECTROMETRY ; LEVEL FLUCTUATION ZONE ; MASS-SPECTROMETRY ; MOLECULAR CHARACTERIZATION ; CHEMICAL-COMPOSITION ; HUMIC SUBSTANCES ; BLACK CARBON ; WATER ; MERCURY
收录类别SCI
语种英语
WOS研究方向Environmental Sciences & Ecology
WOS类目Environmental Sciences
WOS记录号WOS:000405981500049
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
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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.
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