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<p>To investigate the effects of different fertilization levels on the diversity of arbuscular mycorrhizal fungi (AMF) in the soil of ratoon sugarcane in its third year, this study conducted an experiment with four fertilization levels (0%, 25%, 50%, and 100%) applied to the sugarcane cultivar GT58. Soil physicochemical properties at three depths (0–20, 20–40, and 40–60&#xa0;cm), AMF community structure, and sugarcane agronomic traits were analyzed. The results showed that: (1) Excessive fertilization (100%) significantly acidified the topsoil (pH 4.06 in the 0–20&#xa0;cm layer), whereas the acidification in deeper soil layers (20–40, 40–60&#xa0;cm) was lighter. Alkali-hydrolyzable nitrogen content in all the soil layers increased significantly with fertilization level. (2) The AMF community exhibited distinct vertical differentiation in response to fertilization: in the topsoil of 0–20&#xa0;cm, the species composition and α-diversity of AMF were most significantly affected by fertilization, with most differential species occurring in this layer. Excessive fertilization led to a significant decrease in the Shannon index of AMF communities. In contrast, AMF community structure and diversity in deeper layers remained relatively stable and were less affected by fertilization. (3) The AMF community was dominated by the genus <i>Glomus</i>, whose relative abundance in the topsoil increased initially and then declined with increasing fertilization level. (4) Sugarcane yield increased significantly at the 25% fertilization level, but excessive fertilization (100%) did not result in a significant yield gain and led to the accumulation of available potassium in the soil. The study demonstrated that excessive fertilization threatens soil health by acidifying the topsoil, suppressing the AMF diversity in topsoil, and increasing nutrient leaching. In contrast, deeper soils, due to their stronger balance capacity and sparser root distribution, exhibited greater stability in AMF communities. It is recommended to optimize fertilization rates (e.g., 25–50% of the conventional rate) and combine with organic amendments to enhance sugarcane yield while protecting the AMF communities and their ecological functions in the more vulnerable surface-layer, thereby providing a foundation for sustainable sugarcane cultivation.</p>

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Analysis of Arbuscular Mycorrhizal Fungal Community in Soil of Sugarcane at Different Tillage Depths

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Qun-Qing Huang,
  • Sheng Wang,
  • Ying-Jie Nong,
  • Kai-Mao Zhong,
  • Yi-Cheng Su,
  • Xiao-Juan Qin,
  • Jin-Lian Zhang,
  • Yi-Hao Kang,
  • Ting-Su Chen,
  • Shi-Yuan Zeng,
  • Xi-Chao Deng,
  • Ming-Guo Jiang,
  • Yang-Rui Li

摘要

To investigate the effects of different fertilization levels on the diversity of arbuscular mycorrhizal fungi (AMF) in the soil of ratoon sugarcane in its third year, this study conducted an experiment with four fertilization levels (0%, 25%, 50%, and 100%) applied to the sugarcane cultivar GT58. Soil physicochemical properties at three depths (0–20, 20–40, and 40–60 cm), AMF community structure, and sugarcane agronomic traits were analyzed. The results showed that: (1) Excessive fertilization (100%) significantly acidified the topsoil (pH 4.06 in the 0–20 cm layer), whereas the acidification in deeper soil layers (20–40, 40–60 cm) was lighter. Alkali-hydrolyzable nitrogen content in all the soil layers increased significantly with fertilization level. (2) The AMF community exhibited distinct vertical differentiation in response to fertilization: in the topsoil of 0–20 cm, the species composition and α-diversity of AMF were most significantly affected by fertilization, with most differential species occurring in this layer. Excessive fertilization led to a significant decrease in the Shannon index of AMF communities. In contrast, AMF community structure and diversity in deeper layers remained relatively stable and were less affected by fertilization. (3) The AMF community was dominated by the genus Glomus, whose relative abundance in the topsoil increased initially and then declined with increasing fertilization level. (4) Sugarcane yield increased significantly at the 25% fertilization level, but excessive fertilization (100%) did not result in a significant yield gain and led to the accumulation of available potassium in the soil. The study demonstrated that excessive fertilization threatens soil health by acidifying the topsoil, suppressing the AMF diversity in topsoil, and increasing nutrient leaching. In contrast, deeper soils, due to their stronger balance capacity and sparser root distribution, exhibited greater stability in AMF communities. It is recommended to optimize fertilization rates (e.g., 25–50% of the conventional rate) and combine with organic amendments to enhance sugarcane yield while protecting the AMF communities and their ecological functions in the more vulnerable surface-layer, thereby providing a foundation for sustainable sugarcane cultivation.