Biochar Promotes Phosphorus Solubilization by Reconstructing Soil Organic Acid and Microorganism Networks

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Abstract
Biochar has the ability to enhance the solubilization of phosphorus (P) in soil. Nonetheless, the role played by organic acid and microorganism in P solubilization under biochar application conditions remains unclear. In this study, we examined the relationship between soil organic acids and microorganisms, as well as P fractions, following the addition of biochar, utilizing foxtail millet, maize, soybean, and mung bean as materials. The results demonstrated that the addition of biochar increased the availability of P by increasing the content of the resin-P fraction and decreasing the content of the NaOH-Pi, NaOH-Po, and HCl-P fractions in the soil. In addition, resin-P fractions were elevated by 142.78%, 95.27%, 35.99%, and 21.55% in the soils of foxtail millet, maize, soybean, as well as mung bean, respectively. In the microorganisms, the addition of biochar promotes P conversion by increasing the number of labile-P-associated microorganisms and decreasing the number of moderate-labile-P- and non-labile-P-associated microorganisms. In the organic acids, biochar expanded the biological pathways for the solubilization of moderate-labile-P through organic acids. This study illustrates the potential mechanism of biochar to enhance soil P availability.
Funding Information
  • Construction Project of Double First-Class Initiative in Heilongjiang Province “Green and Low-Carbon of Grain Crops” (LJGXCG2022-107, YS20B16, UNPYSCT-2020042)
  • Provincial-Academy Technology Cooperation Project in Heilongjiang (LJGXCG2022-107, YS20B16, UNPYSCT-2020042)
  • Training Program for Youth Innovation Talents of Heilongjiang Educational Committee (LJGXCG2022-107, YS20B16, UNPYSCT-2020042)

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