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<p>Human-induced nitrogen deposition has significantly altered grassland ecosystems globally. Nutrient-poor grasslands arise from both above-ground and below-ground processes, yet they exhibit strong responses to external disruptions. This review provides a synthesis of present research on the impact of nitrogen on soil microbiota functions and arbuscular mycorrhizal fungi (AMF). Increased nitrogen loading triggers shifts in the microbial community, transitioning from oligotrophic to saprotrophic dominance, while leading to a decline in AMF populations, biodiversity, and ecological functions. Additionally, soil degradation hampers nutrient recycling, diminishes phosphorus absorption, and destabilizes carbon storage, resulting in reduced biodiversity and lower productivity in grasslands. The combined effects of competitive environmental conditions among AMF, saprotrophic fungi, and plant growth-promoting rhizobacteria (PGPR) further exacerbate these issues. Nitrogen deposition severely disrupts plant-soil feedback systems by undermining beneficial plant-soil ecology, making ecosystems more susceptible to external stressors. Accurate ecological predictions and effective conservation strategies demand a thorough understanding of these complex interactions. Ultimately, the review highlights the importance of long-term research to maintain grassland functionality in the face of changing environmental conditions.</p>

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Arbuscular mycorrhizal fungi and soil microbial communities under nitrogen deposition in nutrient-limited grasslands: a systematic review

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Muhammad Numan Ali,
  • Md Akramul Islam,
  • Saddam Saqib,
  • Muhammad Sufhan Tahir,
  • Tahir Saadu,
  • Ans Saeed,
  • Aqarab Husnain Gondal

摘要

Human-induced nitrogen deposition has significantly altered grassland ecosystems globally. Nutrient-poor grasslands arise from both above-ground and below-ground processes, yet they exhibit strong responses to external disruptions. This review provides a synthesis of present research on the impact of nitrogen on soil microbiota functions and arbuscular mycorrhizal fungi (AMF). Increased nitrogen loading triggers shifts in the microbial community, transitioning from oligotrophic to saprotrophic dominance, while leading to a decline in AMF populations, biodiversity, and ecological functions. Additionally, soil degradation hampers nutrient recycling, diminishes phosphorus absorption, and destabilizes carbon storage, resulting in reduced biodiversity and lower productivity in grasslands. The combined effects of competitive environmental conditions among AMF, saprotrophic fungi, and plant growth-promoting rhizobacteria (PGPR) further exacerbate these issues. Nitrogen deposition severely disrupts plant-soil feedback systems by undermining beneficial plant-soil ecology, making ecosystems more susceptible to external stressors. Accurate ecological predictions and effective conservation strategies demand a thorough understanding of these complex interactions. Ultimately, the review highlights the importance of long-term research to maintain grassland functionality in the face of changing environmental conditions.