Aspergillus niger enhances the efficiency of sewage sludge biochar as a phosphorus source

Experimental dataset associated with the article "Aspergillus niger enhances the efficiency of sewage sludge biochar as a phosphorus source". Abstract: Phosphorus-rich biochar derived from sewage sludge (SS) could be an alternative P source for agriculture. However, most of biochar P is not readily available to plants. We evaluated the po-tential of P release from SS biochar into soil solution by Aspergillus niger. Additionally, we assessed the effect of SS biochar on the solubilization of phosphate minerals by the fungus. An incubation study was performed for 7 days in shaken flasks containing culture medium supplemented or not with a P-fixing soil. Biochar showed a dual role in phosphate solubilization by A. niger: i) improved solubilization of AlPO4 and rock phosphate; and ii) acted as a P source. Aspergillus niger solubilized up to 50% of the P contained in the biochar. A combined application of SS biochar and A. niger increased P availability by 500 times in a solution containing P-fixing soil. These results suggest that P use efficiency from SS biochar could be improved by A. niger, allowing use of lower doses of this soil amendment. These findings contribute to a better understanding of the role of phos-phate-solubilizing microorganisms in the interaction between soil and biochar. Furthermore, the results underpin the potential P fertilizer value of the SS biochar.与论文《黑曲霉（Aspergillus niger）提升污泥生物炭作为磷源的效率》相关的实验数据集。 摘要：以污泥（sewage sludge, SS）为原料制备的富磷生物炭可作为农业生产中磷源的替代方案。然而，多数生物炭中的磷难以被植物直接吸收利用。本研究评估了黑曲霉（Aspergillus niger）将污泥生物炭中的磷释放至土壤溶液的潜力。此外，我们还探究了污泥生物炭对该真菌溶解磷酸盐矿物的影响。本研究在添加或未添加固磷土壤（P-fixing soil）的培养基振荡烧瓶中开展了为期7天的培养试验。结果显示，黑曲霉溶解磷酸盐的过程中，生物炭发挥双重作用：其一，提升了磷酸铝（AlPO4）与磷矿粉的溶解效率；其二，作为磷源被真菌利用。黑曲霉可将生物炭中多达50%的磷溶解。在含有固磷土壤的体系中，污泥生物炭与黑曲霉联合施用可使磷的有效性提升500倍。上述结果表明，通过黑曲霉可提升污泥生物炭的磷利用效率，从而实现该土壤改良剂的减量施用。本研究有助于进一步理解溶磷微生物（phosphate-solubilizing microorganisms）在土壤与生物炭互作过程中的作用机制。此外，本研究结果也佐证了污泥生物炭作为磷肥料的应用潜力。