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| Effects of Aspergillus niger on the release and transformation of phosphorus in biochar |
| Received:February 09, 2021 |
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| KeyWord:soil;Aspergillus niger;biochar;release of phosphorus;transformation of phosphorus |
| Author Name | Affiliation | E-mail | | LI Han | School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China | | | LAI Zhanghui | School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China | | | WU Daishe | School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China
Key Laboratory of Poyang Lake Environment and Resources Utilization Ministry of Education, Nanchang University, Nanchang 330031, China | | | WU Shan | School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China | wushan@ncu.edu.cn |
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| Abstract: |
| This study aimes to understand the release and transformation mechanism of phosphorus from biochar in the soil in the presence of phosphate solubilizing fungi. Two kinds of biochar were prepared using pyrolyzing sludge and rice straw at 400℃ and 700℃ in anaerobic conditions. A strain with phosphate-solubilizing ability, Aspergillus niger, was screened from the soil, and biochar was used as the only phosphorus source while culturing Aspergillus niger for the study. The results showed that the release of phosphorus from sludge biochar increased from 0.73 mg·g-1 to 78.55 mg·g-1, and from straw biochar, increased by more than 50%. The pyrolytic temperature of biomass had an important effect on the release of phosphorus in sludge biochar. The release of phosphorus from sludge biochar prepared at 700℃ was 46% higher than that released from sludge biochar prepared at 400℃, but no obvious effect of pyrolytic temperature was exhibited for rice straw biochar. The speciation of phosphorus released from biochar was pyrophosphate in the absence of Aspergillus niger, while orthophosphate was the dominant species in the microcosm experiment with Aspergillus niger. This study indicates that Aspergillus niger can promote the release and transformation of phosphorus in biochar, which can elevate the levels of phytoavailable phosphate in soil and further improve the application of biochar. |
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