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Insights into solubility of soil humic substances and their fluorescence characterisation in three characteristic soils

文献类型：期刊论文

作者Mohinuzzaman, M.2,3,4; Yuan, Jie5; Yang, Xuemei2,3; Senesi, Nicola1; Li, Si-Liang2,3; Ellam, Rob M.2,6; Mostofa, Khan M. G.2,3; Liu, Cong-Qiang2,3
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2020-06-10
卷号720页码:14
ISSN号0048-9697
关键词Solubility Humic substances Humic acid-like Fulvic acid-like Protein-like fluorophores Dissolved organic carbon Nutrients Fluorescence (excitation-emission matrix EEM) spectroscopy PARAFAC modeling
DOI10.1016/j.scitotenv.2020.137395
英文摘要Soil humic substances (HS) are involved in almost all biogeochemical processes and functions in soils, thus their extraction from aiming to their characterization is very important. However, many factors that influence HS extraction from soil still need further studies. The aim of this work was to assess and quantify comparatively the solubility of soil HS as a function of extraction time, various extractants, solid to liquid ratio and sequential extraction. In this work three different soils, i.e. a forest, a maize and a paddy soil, were examined to assess the solubility of soil HS based on their fluorescence (excitation-emission matrix, EEM) features and changes in nutrient (NO3--N, PO43--P and dissolved Si) contents using multiple extraction approaches (time-dependent, various extractants, solid to liquid ratio, and sequential extraction). Three fluorescent components, i.e. humic acids-like (HA-like), fulvic acids-like (FA-like), and protein-like fluorophores (PLF), were identified by parallel factor (PARAFAC) analysis of EEM spectra of the various soil extracts. The solubility of HS, dissolved organic carbon (DOC) and nutrients were shown to increase with extraction time, except for PLF. The FA-like fraction disappeared completely in KCl extracts of all three soils, suggesting the inefficiency of salt extraction. Conversely, HS and nutrients solubility substantially increased in alkaline extracts, and dissolved Si was correlated significantly with the fluorescent intensities of HA-like and FA-like, thus confirming the well-known typical process of alkaline dissolution of HS bound to phytolith and silicate minerals. The relative solubility of HS and nutrients was higher at lower solid to liquid ratio (1:250-1:100), whereas their maximum yields was achieved at high solid to liquid ratio (1:10) for all three soils. Sequential extraction results showed that the first water extraction step contributed 42-55% of HS, which suggested that a single extraction was insufficient to recover HS. In conclusion, water and alkaline extraction could provide, respectively, the labile and insoluble complexed HS existing in soil. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词DISSOLVED ORGANIC-MATTER ; EXCITATION-EMISSION MATRIX ; AGRICULTURAL LAND-USE ; FULVIC-ACID ; CARBON SEQUESTRATION ; WATER ; TEMPERATURE ; RIVER ; BIODEGRADABILITY ; EXTRACTION
资助项目National Key R & D Programof China[2016YFA0601000] ; National Natural Science Foundation of China[U1612441] ; Key Construction Program of the National "985" Project, Tianjin University, China
WOS研究方向Environmental Sciences & Ecology
语种英语
出版者ELSEVIER
WOS记录号WOS:000525736600077
资助机构National Key R & D Programof China ; National Key R & D Programof China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China ; National Key R & D Programof China ; National Key R & D Programof China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China ; National Key R & D Programof China ; National Key R & D Programof China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China ; National Key R & D Programof China ; National Key R & D Programof China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95552]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Mostofa, Khan M. G.; Liu, Cong-Qiang
作者单位1.Univ Bari Aldo Moro, Dipto Sci Suolo Pianta & Alimenti, Via G Amendola 165-A, I-70126 Bari, Italy
2.Tianjin Univ, Inst Surface Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China
3.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, 92 Weijin Rd, Tianjin 300072, Peoples R China
4.Noakhali Sci & Technol Univ, Dept Environm Sci & Disaster Management, Noakhali, Bangladesh
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beitucheng Western Rd, Beijing 100029, Peoples R China
6.Scottish Univ Environm Res Ctr, Rankine Ave,Scottish Enterprise Technol Pk, E Kilbride G75 0QF, Lanark, Scotland
推荐引用方式
GB/T 7714		 Mohinuzzaman, M.,Yuan, Jie,Yang, Xuemei,et al. Insights into solubility of soil humic substances and their fluorescence characterisation in three characteristic soils[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,720:14.
APA Mohinuzzaman, M..,Yuan, Jie.,Yang, Xuemei.,Senesi, Nicola.,Li, Si-Liang.,...&Liu, Cong-Qiang.(2020).Insights into solubility of soil humic substances and their fluorescence characterisation in three characteristic soils.SCIENCE OF THE TOTAL ENVIRONMENT,720,14.
MLA Mohinuzzaman, M.,et al."Insights into solubility of soil humic substances and their fluorescence characterisation in three characteristic soils".SCIENCE OF THE TOTAL ENVIRONMENT 720(2020):14.

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来源：地质与地球物理研究所

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