Abstract
It aimed to investigate and evaluate the soil amelioration process of bauxite residues with the amendments of organic materials from different sources. Wheat straw, poultry manure compost, and biosolids were chosen as the added organic materials. A series of essential soil properties were analyzed to evaluate the effects of organic materials on the soil amelioration of bauxite residue. The results indicated that organic amendments could obviously improve the texture of bauxite residues by increasing large aggregates contents, and elevating its organic matter content and fertility level (such as TN and TP). At the same time, organic additions were effective in reducing bauxite residues’ salinity as pH, electrical conductivity and sodium content were obviously decreased in all rehabilitated treatments in comparison with control treatment. These improvements created sufficient conditions for a quick recovery of microbial communities in bauxite residues matrix. The maximum microbial biomass C increased to 0.642 g-C·kg−1, and the activities of urease, catalase, and invertase were massively elevated, especially for those after a year of rehabilitation, although alkali-phosphatase was kept a less level compared with other biological parameters. The further principal analysis and cluster analysis indicated that after 1 year of organic amendment, the improved bauxite residues matrix was very close to the reference soil based on the measured soil microbial properties. All the results suggested that organic amendment is an effective way to stimulate the soil amelioration of bauxite residues, and among the three amended organic materials, wheat straw and biosolid were better in improving the abiotic environmental conditions as well as biotic function recovery in soil amelioration of bauxite residue.
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The study was supported by Shandong University of Technology and Zibo City Integration Development Project under Grant No. 2016ZBXC102 and the National Natural Science Foundation of China (NSFC) under Grant No. 41671322 and No. 41877122.
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Dong, Y., Shao, Y., Liu, A. et al. Insight of soil amelioration process of bauxite residues amended with organic materials from different sources. Environ Sci Pollut Res 26, 29379–29387 (2019). https://doi.org/10.1007/s11356-019-06007-y
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DOI: https://doi.org/10.1007/s11356-019-06007-y