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| Effects of organic phosphate-solubilizing bacteria on phosphorus release from sediments in Swan Lagoon |
| Received:September 20, 2022 |
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| KeyWord:organic phosphate-solubilizing bacteria;phosphorus release;alkaline phosphatase;sediment;Swan Lagoon |
| Author Name | Affiliation | E-mail | | MA Kai | Ocean School, Yantai University, Yantai 264005, China | | | XIE Jiahui | Ocean School, Yantai University, Yantai 264005, China | | | WEI Liequn | Ocean School, Yantai University, Yantai 264005, China | | | JIANG Xiaojing | Ocean School, Yantai University, Yantai 264005, China | | | GAO Li | Ocean School, Yantai University, Yantai 264005, China | ligao117@126.com |
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| Abstract: |
| To identify the dominant organic phosphate-solubilizing bacteria（OPB）species in Swan Lagoon sediments, the technology of plate culture and 16S rDNA sequence analysis was used. Thereafter, three representative strains（Geobacillus stearothermophilus, Bacillus flexus, and Bacillus altitudinis）were selected for the simulation experiment investigating the influence of OPB inoculation on water total phosphorus（TP）concentration, alkaline phosphatase activity（APA）, and P fractions in sediments. The experiment included two groups of sterilized and non-sterilized sediments. The results showed that Bacillus was the dominant OPB genus in the sediments of Swan Lagoon in the winter. The sterilization of sediments had a significant effect on the concentration of TP in water and TP concentrations at three inoculation treatments of the sterilized group were significantly higher than that of the non-sterilized group. The OPB inoculation promoted P release from the sediments in Swan Lagoon. TP concentration for different treatments of the sterilized group ranged between 0.049–0.335 mg·L-1 and increased markedly for the B. flexus and B. altitudinis treatments. APA and loosely adsorbed P（NH4Cl-P）concentrations in sediments increased for most treatments while the concentrations of redox sensitive P（BD-P）and Fe/Al bound P（NaOH-P）decreased. This study indicates that there are large quantities of OPB in the sediments of Swan Lagoon that affect the transformation and release of sediment P by excreting alkaline phosphatase or changing the redox condition. Therefore, the contribution of OPB to sediment P release cannot be ignored in Swan Lagoon. |
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