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Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (9): 107-116.doi: 10.11924/j.issn.1000-6850.casb2025-0375

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Effects of Extreme Rainstorms on Mycorrhizae of Alien and Native Plants in Abandoned Karst Farmlands

ZHAN Yifei1(), ZHAO Yonglin1, QI Yuancai1, TAO Jianping1,2()   

  1. 1 Key Laboratory of Eco-environment in Three Gorges Reservoir Region (Ministry of Education)/Chongqing Key Laboratory of Plant Ecology and Resources in Three Gorges Reservoir Region/ School of Life Sciences, Southwest University, Chongqing 400715
    2 Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, Southwest University, Chongqing 400715
  • Received:2025-05-21 Revised:2025-10-11 Online:2026-05-15 Published:2026-05-15

Abstract:

This study aimed to explore the responses of mycorrhizae of alien plants and native plants to the changes of rainstorm frequency in karst areas. Dominant alien plants and native plants from karst abandoned land under four rainfall treatments (natural rainfall (CK), low-frequency rainstorm (T20), medium-frequency rainstorm (T40), and high-frequency rainstorm (T60)) were used to determine the mycorrhizal colonization rate of plants, soil hyphal density, and spore density. The results showed: (1) Medium-frequency and high-frequency rainstorm treatments significantly increased the arbuscular colonization rate of native plants (P<0.05) and improved soil spore density, but decreased the arbuscular colonization rate of alien plants. Among them, the spore density of alien plants only increased under high-frequency rainstorm treatment. (2) Medium-frequency rainstorm treatment significantly reduced the hyphal density of native plants (P<0.05), while the hyphal density of alien plants showed no significant change. (3) Extreme rainstorm treatments reduced the number of plant species with mycorrhizal differences, and different plant species showed variations in their responses to extreme rainstorms. The results indicated that rainstorm frequency affected the mycorrhizal colonization characteristics differently for different plant species; native plants exhibited a more sensitive response to rainfall changes.

Key words: extreme rainstorm, alien plant, native plant, mycorrhizal colonization rate, hyphal density, spore density, arbuscular mycorrhizal fungi, Karst

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