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Abstract <p>Arbuscular mycorrhizal fungi (AMF) are widespread and play a pivotal role in enhancing plant salt tolerance and thus aiding ecosystem restoration. However, how AMF communities vary with soil salinity and other physicochemical soil parameters has not been determined well. The purpose of this study was thus to relate plant community integrity and AMF diversity with the soil conditions. Here, we assign the Songnen saline-alkali Eurasian Steppe grasslands in Northeastern China surrounding the town Zhaodong in Heilongjiang Province to four vegetation integrity levels: poor (L1), relatively poor (L2), relatively good (L3), and good (L4). Soil from the top 30 cm, the main rooting zone, was analyzed on its physicochemical properties. The diversity of the AMF communities was characterized by high-throughput sequencing and the root colonization potential and sporulation, using <i>Sorghum biocolor</i> as a bioassay plant for pot cultures. The <i>Leymus chinensis</i> steppe’s botanical integrity improved as soil salinity dropped. <i>Glomus</i> was the dominant AMF genus under high soil salinity and alkalinity (sodicity). Composition and diversity of the AMF communities differed significantly across the four types of grasslands. Soil pH and organic matter were the most important determinants of AMF community composition and structure. The colonization pressure did not correspond with the number of newly formed spores. The study revealed that saline-alkali grasslands host considerable AMF diversity differing depending on vegetation and soil pH, salinity, and organic carbon content, which may be important to consider in the restoration of grasslands on saline-alkaline soil.</p>

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Botanical Integrity of Leymus chinensis Meadow Steppe Correlates with Parameters of Physicochemical Soil Fertility and Arbuscular Mycorrhizal Fungal Richness and Diversity in the Songnen Plain in NE China Threatened by Soil Salinization

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • J. Li,
  • Y. Liu,
  • X. Lu,
  • Z. Wang,
  • C. Yang

摘要

Abstract

Arbuscular mycorrhizal fungi (AMF) are widespread and play a pivotal role in enhancing plant salt tolerance and thus aiding ecosystem restoration. However, how AMF communities vary with soil salinity and other physicochemical soil parameters has not been determined well. The purpose of this study was thus to relate plant community integrity and AMF diversity with the soil conditions. Here, we assign the Songnen saline-alkali Eurasian Steppe grasslands in Northeastern China surrounding the town Zhaodong in Heilongjiang Province to four vegetation integrity levels: poor (L1), relatively poor (L2), relatively good (L3), and good (L4). Soil from the top 30 cm, the main rooting zone, was analyzed on its physicochemical properties. The diversity of the AMF communities was characterized by high-throughput sequencing and the root colonization potential and sporulation, using Sorghum biocolor as a bioassay plant for pot cultures. The Leymus chinensis steppe’s botanical integrity improved as soil salinity dropped. Glomus was the dominant AMF genus under high soil salinity and alkalinity (sodicity). Composition and diversity of the AMF communities differed significantly across the four types of grasslands. Soil pH and organic matter were the most important determinants of AMF community composition and structure. The colonization pressure did not correspond with the number of newly formed spores. The study revealed that saline-alkali grasslands host considerable AMF diversity differing depending on vegetation and soil pH, salinity, and organic carbon content, which may be important to consider in the restoration of grasslands on saline-alkaline soil.