Relevance of dissolved organic matter generated from green manuring of Chinese milk vetch in relation to water-soluble cadmium
文献类型： 外文期刊
作者： Xie, Jie 1 ; Dong, Aiqin 4 ; Liu, Jia 2 ; Su, Jinping 2 ; Hu, Po 2 ; Xu, Changxu 2 ; Chen, Jingrui 2 ; Wu, Qitang 1 ;
作者机构： 1.South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China
2.Jiangxi Acad Agr Sci, Soil Fertilizer & Environm & Resources Inst, Nanchang 330200, Jiangxi, Peoples R China
3.Minist Agr, Key Lab Crop Ecophysiol & Farming Syst Middle & L, Nanchang 330200, Jiangxi, Peoples R China
4.Jiangxi Agr Univ, Dept Assets & Lab Management, Nanchang 330045, Jiangxi, Peoples R China
关键词： Dissolved organic matter; Chinese milk vetch; Water-soluble cadmium; Fluorescence spectrum; Parallel factor analysis
期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）
ISSN： 0944-1344
年卷期： 2019 年 26 卷 16 期
页码：
收录情况： SCI
摘要： Dissolved organic matter (DOM) can become a carrier of soil contaminants. Therefore, an understanding of the evolution and characteristics of DOM produced by Chinese milk vetch during green manuring is crucial. In this study, DOM solutions from 28days' manuring with three different organic materials were characterized using three-dimensional fluorescence excitation-emission matrix (3D-EEM) with parallel factor (PARAFAC) analysis, and ultraviolet-visible spectroscopy. With the green manuring milk vetch at flowering period (MVFP), the DOC and water-soluble cadmium (WS-Cd) in soil solution reached 1875mg/l and 2.64g/l, respectively, on day 6 after manuring. The PARAFAC analysis modeled three components: protein-like (tryptophan) and two humic-like components (humic acid and fulvic acid); DOM produced by MVFP was primarily protein-like during the early stage of decomposition. The aromaticity and molecular weight of DOM in the MVFP treatment was lower than in the other treatments, which could promote the release of soil particle-adsorbed Cd to soil solution. Principal components analysis showed that aromaticity was the main factor affecting Cd solubility, and the negative linear correlation of aromaticity with WS-Cd reached 0.4827. The results of this study supported the idea that manuring with MVFP might accelerate Cd infiltration to deep soil with water under gravity.
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