Long-Term Observation of Field Application of Reclaimed Mine Substrates by Ryegrass–AMF–Sludge Combination: Key Factors of Organic Carbon Accumulation
Publication: Journal of Environmental Engineering
Volume 149, Issue 11
Abstract
The effects of planting ryegrass combined with sludge addition and arbuscular mycorrhizal fungi (AMF) inoculation on organic carbon accumulation in reclaimed mine substrates (RMS) were investigated. A 6-year field experiment was carried out; in the 0–15-cm edaphic layer, a mixed matrix was constructed according to the ratio of fly ash to coal gangue to , with of AMF inoculated and ryegrass sowed annually. The particle size, carbon fraction, enzyme activity, AMF-related protein and ryegrass rhizosphere effect of RMS aggregates were monitored regularly. The cumulative contribution of the above factors to organic carbon in RMS was quantitatively explored by path analysis. After reclamation, the texture of reclamation matrix in mining area was improved, the stability of aggregates augmented significantly with the proportion of large aggregates increased gradually. Organic carbon in RMS increased by 1.96 times to ; the contents of total N and available P increased significantly year by year, mainly concentrated in aggregates. Path analysis showed that the underground biomass of ryegrass and 0.5–2-mm aggregates were the two factors with the strongest direct positive effect on organic carbon accumulation in RMS. In addition, available phosphatase and easily extractable glomalin affected the process through complex interaction with each other. A combination of ryegrass-AMF-sludge on a reclamation mining field could improve the quality of RMS through aggregates by promoting the process of soil formation, and ryegrass root growth conducive to organic carbon accumulation.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This work was financially supported by National Natural Science Foundation of China (No. 51974314) and Jiangsu Provincial Environmental Protection Science and Technology Project: Application of mycorrhizal biotechnology in ecological restoration of mining area (No. 2007024).
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Published In
Journal of Environmental Engineering
Volume 149 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 6, 2023
Accepted: Jun 28, 2023
Published online: Sep 13, 2023
Published in print: Nov 1, 2023
Discussion open until: Feb 13, 2024
ASCE Technical Topics:
- [Inorganic compounds]
- Aggregates
- Ashes
- Carbon compounds
- Chemicals
- Chemistry
- Engineering fundamentals
- Engineering materials (by type)
- Environmental engineering
- Field tests
- Fly ash
- Geology
- Geotechnical engineering
- Infrastructure
- Materials engineering
- Mathematical functions
- Mathematics
- Matrix (mathematics)
- Microbes
- Organic compounds
- Organisms
- Pavements
- Pollutants
- Sludge
- Substrates
- Tests (by type)
- Transportation engineering
- Wastes
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