Abstract
Purpose
Phosphorus (P) plays an important role in enhancing plant yield. Phosphate-solubilizing bacteria (PSB) could enhance soil P availability. This study aimed to determine the effects of PSB inoculation on soil P fractions and bacterial community and reveal the comprehensive linkages among soil bacteria, P fractions, and nutrient contents.
Materials and methods
In this study, PSB, Klebsiella ZP-2, was inoculated into soil with four different inoculation rates (2%, 4%, 6%, and 8%, bacterial suspension/soil weight = v:w); soil phosphatase activity, P fractions, function gene, and 16S rRNA were detected to comprehensively assess the effects of strain ZP-4 on soil properties, P fractions, and bacterial community.
Results and discussion
Soil available P and N were significantly higher in the treatments with 4% and 6% inoculation rates than that in the control. Compared with control, the contents of soil inorganic P extracted by sodium hydroxide (NaOH-Pi), water (H2O-Pi), and sodium bicarbonate (NaHCO3-Pi) were significantly increased. However, inorganic P extracted by hydrochloric acid (HCl-Pi) and residual P (residual-P) contents were significantly decreased, especially in the 4% inoculation rates. The strain ZP-2 stimulated functional genes (phoC and phoD) and soil phosphatase activity to active soil P. Meanwhile, the bacterial community structures were also significantly changed following the strain ZP-2 inoculation.
Conclusion
The strain ZP-2 inoculation improved soil available N and P contents, stimulated phosphatase activity to accelerate P cycling, and altered soil bacterial community. The ZP-2 strain has the potential to be used as a biofertilizers to improve soil fertility.
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Acknowledgements
We thank the funding provided by the National Natural Science Foundation of China (31560204) and Central Financial Project (9022107941) to Wenyuan Zhang.
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Liu, Y., Hosseini Bai, S., Wang, J. et al. Strain Klebsiella ZP-2 inoculation activating soil nutrient supply and altering soil phosphorus cycling. J Soils Sediments 22, 2146–2157 (2022). https://doi.org/10.1007/s11368-022-03221-z
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DOI: https://doi.org/10.1007/s11368-022-03221-z