School of Civil Engineering, Shandong University, Jinan, Shandong, People's Republic of China.
Shandong Province Research Institute of Coal Geology Planning and Exploration, Jinan, Shandong, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Nov;30(52):112385-112396. doi: 10.1007/s11356-023-30273-6. Epub 2023 Oct 13.
The utilization of phosphate-solubilizing bacteria (PSB) in agriculture has long been proposed as an eco-friendly method to enhance soil phosphorus (P) availability, thereby reducing reliance on chemical P fertilizers. However, their application in saline soils is challenged by salt-induced stress on common PSB strains. In this study, we sourced bacterial strains from marine environments, aiming to identify robust PSB strains adaptable to saline conditions and assess their potential as P bio-fertilizers through a microcosm experiment. Our findings indicate that the inoculation of a selected marine PSB, Bacillus paramycoides 3-1a, increased soil available P content by 12.5% when applied alone and by 61.2% when combined with organic amendments. This enhancement results from improved inorganic P solubilization and organic P mineralization in soils. Additionally, these treatments raised soil nitrogen levels, reshaped microbial community structures, and significantly enhanced wheat (Triticum aestivum L.) growth, with P accumulation increasing by 24.2-40.9%. Our results underscore the potential of marine PSB in conjunction with organic amendments for the amelioration of saline agricultural soils.
长期以来，人们一直提议在农业中利用解磷菌（PSB）来提高土壤磷（P）的有效性，从而减少对化学磷肥的依赖。然而，由于常见 PSB 菌株受到盐胁迫的影响，它们在盐渍土壤中的应用受到了挑战。在本研究中，我们从海洋环境中获取了细菌菌株，旨在鉴定适应盐渍条件的鲁棒解磷菌菌株，并通过微宇宙实验评估它们作为磷生物肥料的潜力。我们的研究结果表明，单独接种所选的海洋解磷菌——巨大芽孢杆菌 3-1a，可使土壤有效磷含量增加 12.5%，与有机肥料结合使用时，可增加 61.2%。这种增强是由于土壤中无机磷的溶解和有机磷的矿化得到改善。此外，这些处理还提高了土壤氮素水平，重塑了微生物群落结构，显著促进了小麦（Triticum aestivum L.）的生长，磷的积累增加了 24.2-40.9%。我们的研究结果强调了海洋 PSB 与有机肥料结合使用对改良盐渍农业土壤的潜力。
