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Characterizing Soil Dissolved Organic Matter in Typical Soils from China Using Fluorescence EEM-PARAFAC and UV-Visible Absorption

文献类型： 外文期刊

作者： Qin, Xiao-quan 1 ; Yao, Bo 1 ; Jin, Liang 2 ; Zheng, Xiang-zhou 3 ; Ma, Jie 4 ; Benedetti, Marc F. 5 ; Li, Yongtao 1 ; Re 1 ;

作者机构： 1.South China Agr Univ, Coll Nat Resources & Environm, Joint Inst Environm Res & Educ, Guangzhou 510642, Guangdong, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resources, Beijing 100097, Peoples R China

3.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Fujian, Peoples R China

4.Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China

5.Univ Paris, Inst Phys Globe Paris, CNRS, UMR 7154, 1 Rue Jussieu, F-75005 Paris, France

关键词： Dissolved organic matter; Soil type; Land use; EEMs-PARAFAC; Fluorescence component; UV-visible absorbance

期刊名称：AQUATIC GEOCHEMISTRY （ 影响因子：1.517； 五年影响因子：1.755 ）

ISSN： 1380-6165

年卷期： 2020 年 26 卷 1 期

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) strongly participates in a variety of critical environmental and ecological processes and has a large impact on environmental quality. In this study, ultraviolet-visible absorbance spectroscopy and excitation-emission matrices of fluorescence spectroscopy in combination with parallel factor analysis (EEMs-PARAFAC) were applied to characterize a total of 92 DOM samples extracted from four typical soil types under three different land-use regimes across China. DOC concentrations ranged from 6.52 +/- 1.09 to 25.62 +/- 4.83 mg L-1 and were generally higher in red soil from Guangdong and Guangxi, especially in paddy soil. Three fluorescence components were identified in soil DOM by EEMs-PARAFAC, including high molecular weight UVA humic-like substances (C1), low molecular weight autochthonous humic-like substances (C2), and protein-like substances (C3). DOM from black soil in Heilongjiang, purple soil from Sichuan, and red soil from Zhejiang had more humic-like substances, whereas DOM from yellow soil in Guizhou and red soil from Guangdong and Guangxi had lower degree of aromaticity and higher proportion of microbial-derived protein-like components (C3). Moreover, DOM from paddy soil tended to be more of protein-like components (C3) than that from other land uses and DOM from dryland soil generally had more autochthonous humic-like substances (C2). Our results demonstrated that soil DOM characteristics both varied significantly by soil type and land use, and EEMs-PARAFAC could be a useful approach to characterize the components and sources of heterogeneous DOM in soils.

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