Abstract
Fluorapatite (FAp) is the largest phosphorous (P) reservoir on Earth. However, due to its low solubility, dissolved P is severely deficient in the pedosphere. Fungi play a significant role in P dissolution via excretion of organic acids, and in this regard, it is important to understand their impact on P cycling. The object of this study was to elucidate the balance between P release and F toxicity during FAp dissolution. The bioweathering of FAp was assisted by a typical phosphate-solubilizing fungus, Aspergillus niger. The release of elements and microbial activities were monitored during 5-day incubation. We found that the release of fluorine (F) was activated after day 1 (~90 mg/L), which significantly lowered the phosphate-solubilizing process by day 2. Despite P release from FAp being enhanced over the following 3 days, decreases in both the amount of biomass (52% decline) and the respiration rate (81% decline) suggest the strong inhibitory effect of F on the fungus. We thus concluded that F toxicity outweighs P supply, which in turn inhibits fungi growth and prevents further dissolution of FAp. This mechanism might reflect an underappreciated cause for P deficiency in soils.
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Acknowledgements
We also thank Dr. Xudong Che at Nanjing University State Key Laboratory for the EMPA analyses.
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This work was supported by National Key R&D Program of China (No. 2020YFC1808000). This work was also partially supported by the Fundamental Research Funds for the Central Universities (KYZ202123) and partially supported by Program for Student Innovation Through Research and Training (S20190010 & 201910307090P).
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The manuscript was written by X.S., W.H., and K.K., with assistance of Y.G., M.S., and L.T; Ms. Y.G. contributed to the graphical abstract; X.S., L.T., and M.S. participated in the experiment design; X.S., W.H., and Y.G. analyzed and interpreted the data; the project was supervised by Z.L.
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Shao, ., Hao, W., Konhauser, K.O. et al. The dissolution of fluorapatite by phosphate-solubilizing fungi: a balance between enhanced phosphorous supply and fluorine toxicity. Environ Sci Pollut Res 28, 69393–69400 (2021). https://doi.org/10.1007/s11356-021-15551-5
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DOI: https://doi.org/10.1007/s11356-021-15551-5