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Relevance of dissolved organic matter generated from green manuring of Chinese milk vetch in relation to water-soluble cadmium

  • Jie Xie
  • Aiqin Dong
  • Jia Liu
  • Jinping Su
  • Po Hu
  • Changxu Xu
  • Jingrui Chen
  • Qitang WuEmail author
Research Article
  • 119 Downloads

Abstract

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 28 days’ 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 1875 mg/l and 2.64 μg/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.

Keywords

Dissolved organic matter Chinese milk vetch Water-soluble cadmium Fluorescence spectrum Parallel factor analysis 

Abbreviations

CK

Control treatment in which no organic material is added to the pot

MVFP

Milk vetch at flowering period

MVWP

Milk vetch at withering period

RS

Rice straw

Notes

Funding information

This work was financially supported by National Key R&D Program of China (Grant No. 2017YFD0800903); China Agriculture Research System-Green Manure (CARS-22); Science and Technology Research of Department of Education (No. GJJ170306), Jiangxi Province; and Infrastructure Supporting Project for Scientific Research Institution in Jiangxi Province (No. 20151BBA13033).

Supplementary material

11356_2019_5114_MOESM1_ESM.docx (966 kb)
ESM 1 (DOCX 965 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jie Xie
    • 1
    • 2
    • 3
  • Aiqin Dong
    • 4
  • Jia Liu
    • 2
    • 3
  • Jinping Su
    • 2
    • 3
  • Po Hu
    • 2
    • 3
  • Changxu Xu
    • 2
    • 3
  • Jingrui Chen
    • 2
    • 3
  • Qitang Wu
    • 1
    Email author
  1. 1.College of Natural Resources and EnvironmentSouth China Agricultural UniversityGuangzhouChina
  2. 2.Soil Fertilizer & Environmental and Resources InstituteJiangxi Academy of Agricultural SciencesNanchangChina
  3. 3.Key Laboratory of Crop Ecophysiology and Farming System for the Middle and Lower Reaches of the Yangtze RiverMinistry of Agriculture, P.R. ChinaNanchangChina
  4. 4.Department of Assets and Laboratory ManagementJiangxi Agricultural UniversityNanchangChina

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