Journal article

Chemodiversity of Dissolved Organic Matter and Its Molecular Changes Driven by Rhizosphere Activities in Fe Ore Tailings Undergoing Eco-Engineered Pedogenesis

Songlin Wu, Fang You, Berin Boughton, Yunjia Liu, Tuan AH Nguyen, Jeremy Wykes, Gordon Southam, Lachlan M Robertson, Ting-Shan Chan, Ying-Rui Lu, Adrian Lutz, Dingyi Yu, Qing Yi, Narottam Saha, Longbin Huang



Dissolved organic matter (DOM) plays an important role in soil structure and biogeochemical function development, which are fundamental for the eco-engineering of tailings-soil formation to underpin sustainable tailings rehabilitation. In the present study, we have characterized the DOM composition and its molecular changes in an alkaline Fe ore tailing primed with organic matter (OM) amendment and plant colonization. The results demonstrated that microbial OM decomposition dramatically increased DOM richness and average molecular weight, as well as its degree of unsaturation, aromaticity, and oxidation in the tailings. Plant colonization drove molecular shifts of DOM by depleting the unsatu..

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University of Melbourne Researchers


Awarded by Australian Research Council

Awarded by Australian Synchrotron, part of ANSTO

Funding Acknowledgements

The work is financially supported by the Australian Research Council Linkage Project (LP160100598), Karara Mining Limited, and The Botanic Gardens and Parks Authority (BGPA). The Fe K edge XAFS was undertaken on the XAS beamline at the Australian Synchrotron, part of ANSTO (Project Reference No. AS191/XAS/14392). Dr. Jyh-Fu Lee in NSRRC 17C is acknowledged for the beamtime support. The authors acknowledge the Centre for Microscopy and Microanalysis, the Australian Microscopy & Microanalysis Research Facility, The University of Queensland, and the Queensland node of the Australian National Fabrication Facility (ANFF-Q) for XRD and ATR-FTIR analysis. The authors also thank Dr. Jitao Lv (Chinese Academy of Sciences, China) for sharing invaluable experience in data analysis of FT-ICR-MS data. The authors would also like to thank Dr. Miao Yu (Icahn School of Medicine at Mount Sinai, USA), Veronica Lui (University of Melbourne), and Da Cao (University of Queensland) for help on the ICR-MS analysis, and Zhen Li, Miss Merinda Hall, and Dr. Shuncai Wang (Hohai University, China) for plant cultivation and harvest, plant digestion, and DNA sequencing analysis. The authors also thank the Australian Centre for Ecogenomics, the University of Queensland, Australia, for Illumina sequencing analysis. The authors also thank the anonymous reviewers for their constructive comments, which contributed greatly to the improvement of the manuscript.