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| Biochar synergizes with salt tolerant crops to increase available phosphorus content in coastal mudflat saline soil |
| Received:November 12, 2024 |
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| KeyWord:coastal mudflat saline soil;biochar applications;salt tolerant crops;alkaline phosphatase;microbial diversity;available phosphorus |
| Author Name | Affiliation | E-mail | | XIA Xiaoxue | College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China | | | PAN Shan | College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China | | | YU Chang | College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China | | | LI Mingyan | College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China | | | DOU Qixiang | College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China | | | LIU Xin | College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China | xin163mail@163.com |
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| Abstract: |
| The purpose of this study was to explore the synergistic regulation of biochar and salt tolerant crops on the available phosphorus content, soil physical and chemical properties, and microbial community in coastal mudflat saline soil, and to clarify the key mechanism of phosphorus activation in saline soil, so as to improve the utilization efficiency of mudflat resources. Six treatment groups were set up in the coastal mudflat area of Yancheng, Jiangsu Province, including CK without biochar and milk salt crops, BC with biochar, salt tolerant crops （oats ZW1 and sorghum ZW2）, and the combined treatment of biochar and salt tolerant crops（oats V1 and sorghum V2）. Through field experiments, the physical and chemical properties, microbial diversity, alkaline phosphatase（ALP）activity, and available phosphorus content of the soil were determined. Redundancy analysis and partial least squares structural equation modeling（PLS-SEM）were used to analyze the interactions between various factors. The results showed that the combined treatment of biochar and salt tolerant crops（V1 and V2）significantly reduced soil pH and EC, increased water content, porosity, and cation exchange capacity, and increased soil organic matter, total phosphorus, and available phosphorus content by 603.5%, 447.5%, and 491.0%, respectively. In the microbial community, the abundance of Proteobacteria significantly increased, which was positively correlated with alkaline phosphatase activity（increased by 184%） and was a key microbial group promoting phosphorus activation. The PLS-SEM model indicates that soil physicochemical properties jointly regulate the available phosphorus content through direct pathways（path coefficient 0.693 1）and indirect pathways （microbial community 0.867 7 and alkaline phosphatase activity 0.082 9）. The synergistic effect of biochar and salt tolerant plants can significantly improve the physical and chemical properties of soil, activate microbial functions and improve phosphorus availability, providing scientific basis and technical. |
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