Effects of different biochars on the phosphorus solubilizing capacity of Bacillus megatherium and Pseudomonas aeruginosa
In order to investigate the effect of the addition of biochar on the growth of phosphate-decomposing bacteria and their phosphate-decomposing ability,two kinds of phosphate-decomposing bacteria,namely,Bacillus megaterium and Pseudomonas aeruginosa,which are widely existed in the soil,were selected in this study,and the effects of chicken bone,water hyacinth,and rice biochar prepared at 300℃,500℃,and 700℃on the soluble phosphorus content of single-organism and mixed systems of the two kinds of phosphate-decomposing bacteria was systematically investigated.The results showed that in the monobacterial system of Bacillus megaterium,the addition of chicken bone biochar at 700℃had the best effect on phosphorus solubilization;in the monobacterial system of Pseudomonas aeruginosa,the addition of rice biochar at 300℃had the best effect on phosphorus solubilization.In the mixed system,when the volume ratios of Bacillus megaterium and Pseudomonas aeruginosa were 1∶1 and 1∶3,the addition of 300℃water hyacinth biochar had the best effect on phosphorus removal;and when the volume ratio was 3∶1,the addition of 300℃rice biochar had the best effect on phosphorus removal.The results of Pearson correlation analysis showed that the higher the contents of total organic carbon(TOC),carbon(C)and nitrogen(N)and the larger the pore size of biochar,the better the ability of phosphorus solubilizing bacteria.Therefore,the choice of pyrolysis of plant-based biomass at 300℃for the preparation of biochar can help to optimize its carbon and nitrogen content and pore structure,and enhance the ability of phosphate solubilizing bacteria to solubilize phosphorus,thus playing an important role in soil improvement and agricultural production.
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