数字农科院2.0

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, XQ; Yao, B; Jin, L; Zheng, XZ; Ma, J; Benedetti, MF; Li, YT; Ren, ZL

作者机构：

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

期刊名称： AQUATIC GEOCHEMISTRY

ISSN： 1380-6165

年卷期： 2020 年 26 卷 1 期

页码：

收录情况： JCR（2021版）

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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