Lu Jingkun, Liu Sainan, Chen Wenfu, Meng Jun
Agricultural College, Shenyang Agricultural University, Shenyang, China.
Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, Shenyang, 110866, China.
World J Microbiol Biotechnol. 2023 Feb 2;39(3):87. doi: 10.1007/s11274-023-03533-3.
Low phosphorus utilization and phosphorus fertilizer pollution are serious issues primarily affecting soil health. To investigate the effects of biochar on the growth, phosphorus solubilization, and metabolites of phosphorus-solubilizing bacteria (PSB), rice husk biochar (RH) and rice straw biochar (RS) were incubated with Bacillus megatherium (BM1) and Bacillus mucilaginosus (BM2), respectively. The highest phosphorus solubilization was observed in BM2 following the addition of RS. The dissolved amount of phosphorus was 244.99 mg/L, which was 43.86% higher than that of the control group. Hence, biochar can improve the phosphorus solubilization capacity of PSB by affecting the organic acid and polysaccharide contents, and phosphatase activity secreted by the PSB, as the porous structure and surface characteristics of biochar ensured the adsorption of PSB. This study can help improve the functional activity of PSB and provide basis for improving the utilization of soil phosphorus, which in turn, aid in the development of biochar-based microbial fertilizers.
低磷利用率和磷肥污染是主要影响土壤健康的严重问题。为了研究生物炭对解磷细菌（PSB）生长、磷溶解及代谢产物的影响，分别将稻壳生物炭（RH）和稻草生物炭（RS）与巨大芽孢杆菌（BM1）和胶质芽孢杆菌（BM2）进行培养。添加RS后，BM2的磷溶解量最高。磷的溶解量为244.99mg/L，比对照组高43.86%。因此，生物炭可通过影响PSB分泌的有机酸、多糖含量及磷酸酶活性来提高PSB的磷溶解能力，因为生物炭的多孔结构和表面特性确保了PSB的吸附。本研究有助于提高PSB的功能活性，为提高土壤磷利用率提供依据，进而有助于开发基于生物炭的微生物肥料。
