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Three-dimensional fluorescence spectral characterization of soil dissolved organic matters in the fluctuating water-level zone of Kai County,Three Gorges Reservoir

查看全文 作　　者：Fang [1]FANG;Yan [1]YANG;Jinsong [1]GUO;Hong [1]ZHOU;Chuan [1]FU;Zhe [1]LI 高影响力作者 机构地区：[1]Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment of Ministry of Education,Chongqing University,Chongqing 400045,China高影响力机构 出　　处：《Frontiers of Environmental Science & Engineering》索引2011年第5卷第3期,共9页高影响力期刊 基　　金：This work was supported by the National Science and Technology Support Project(Grant No.2008BAD98B04);National Mega-projects of Science Research for Water Environment improvement(Grant Nos.2009ZX07104-002,and 2009ZX07104-003). 摘　　要：Three-dimensional fluorescence spectroscopy was used to investigate the fluorescent properties of soil dissolved organic matter(DOM)in the water-levelfluctuation zone(WLFZ)of Kai County,Three Gorges Reservoir(TGR).Most of the soil DOM analyzed in this study was found to contain four fluorescence peaks.Peaks A and C represent humic-like fluorescence,whereas peaks B and D represent tryptophan-like fluorescence.Peaks E and F,which represent tyrosine-like fluorescence,only appeared in certain soils.Soil humus was the main source of DOM in soil,and higher concentration of soil DOM was found in the exposed soil than submerged soil.Compared to the peaks A and B,the fluorescence intensities of peaks C and D were strongly influenced by the fluctuating water level.Analysis of fluorescence intensities of different peaks in soil DOM showed that WLFZ soil was not contaminated significantly.Soil DOM contained at least two types of humic-like fluorescence groups and two types of protein-like fluorescence groups.The proportion of the content of peak A in soil organic matter was quite stable.The soil DOM in exposed soil had relatively high humification and aromaticity,and periodic submerging and exposure of soil had an impact on the humification of soil DOM. 关 键 词：water-level-fluctuation zone(WLFZ) SOIL dissolved organic matter(DOM) three-dimensional fluorescence spectra
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