Yan Qiaoyun, Zhang Yitong, Xu Zhenting, Qu Wenying, Li Junfeng, Li Wenhao, Zhao Chun, Ling Hongbo
College of Water Conservancy and Architecture Engineering, Shihezi University, Shihezi 832000, China.
Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production and Construction Group, Shihezi University, Shihezi 832000, China.
Microorganisms. 2025 Jul 12;13(7):1653. doi: 10.3390/microorganisms13071653.
Limited research has been conducted on the potential and mechanisms of irrigating with wastewater and microalgae to improve saline-alkali land. This study used three irrigation treatments (freshwater, saline wastewater, and saline wastewater with microalgae) to irrigate , and microalgae promoted the growth of and increased soil nutrient content, increasing available nitrogen (4.85%), available phosphorus (44.51%), and organic carbon (24.05%) while alleviating salt stress through reduced soil salinity (13.52%) and electrical conductivity (21.62%). These changes promoted eutrophic bacteria while inhibiting oligotrophic bacteria. Bacterial community composition exhibited significant variations, primarily driven by soil pH, total nitrogen, and organic carbon content. Notably, rhizosphere bacteria showed enhanced functional capabilities, with increased abundance of salt stress resistance and nitrogen metabolism-related genes compared to original soil, particularly under saline irrigation conditions. Furthermore, microalgae addition enriched nitrogen metabolism-related gene abundance. These findings revealed the potential role of key bacteria in enhancing plant growth and the soil environment and highlighted the potential of applying , wastewater, and microalgae for the synergistic improvement of saline-alkali land.
关于利用废水和微藻灌溉以改良盐碱地的潜力和机制，目前开展的研究有限。本研究采用三种灌溉处理方式（淡水、含盐废水和含微藻的含盐废水）进行灌溉，微藻促进了植物生长并增加了土壤养分含量，使有效氮增加了4.85%、有效磷增加了44.51%、有机碳增加了24.05%，同时通过降低土壤盐分（13.52%）和电导率（21.62%）缓解了盐胁迫。这些变化促进了富营养细菌的生长，同时抑制了贫营养细菌。细菌群落组成呈现出显著差异，主要受土壤pH值、总氮和有机碳含量的驱动。值得注意的是，根际细菌的功能能力增强，与原始土壤相比，耐盐胁迫和氮代谢相关基因的丰度增加，尤其是在含盐灌溉条件下。此外，添加微藻使氮代谢相关基因的丰度增加。这些发现揭示了关键细菌在促进植物生长和土壤环境方面的潜在作用，并突出了应用微藻、废水和微藻协同改良盐碱地的潜力。
