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- Title
青藏高原高寒草地 AM 真菌分布及其对近自然恢 复的生态作用.
- Authors
温杨雪; 赵博; 罗巧玉; 贾云龙; 冯涛; 王强
- Abstract
Overgrazing and global climate change have caused most of the Tibetan Plateau alpine grasslands to show a continuous degradation trend. The degradation of the alpine grasslands has led to the gradual replacement of aboveground plant communities, and changes in the diversity and richness of underground soil microbial communities. This review aims at exploring the distribution characteristics and physiological and ecological effects on close-to-nature restoration of arbuscular mycorrhizal (AM) fungi in the alpine grasslands. In the alpine grasslands, 61 species of 14 genera in 4 orders of AM fungi have been reported, accounting for about 20% of the known AM fungal species. In the rhizosphere of grasses, the species abundance of AM fungi is the highest in alpine grassland; while in the sedge rhizosphere, the AM fungal spore density is the highest. Among the three alpine grassland vegetation types, AM fungi were the most abundant in alpine steppe with 33 species, secondarily in mountain shrub steppe with 32 species and only 22 species in alpine meadow. At species level, Acaulospora laevis and Pacispora scintillans are dominant in the alpine steppe, Funneliformis mosseae is dominant in the montane scrub, and A. laevis, Glomus claroideum, and P. scintillans dominate the alpine meadow. The mycorrhizal networks of indigenous AM fungi in alpine grassland can promote plant establishment and growth by regulating the absorption and allocation of nutrient elements; but the invasion of poisonous weeds can change the indigenous AM species diversity and common mycorrhizal networks, limiting the actual niche expansion of native grass species. AM fungal community has high environmental adaptability and resilience in the degraded alpine grassland. AM fungal community restoration not only regulates the establishment and diversity of aboveground plant community, but also increases the production of AM fungal product, glomalin-related soil protein, thereby synergistically improving the underground soil micro-ecosystem, shaping soil habitat for the early vegetation restoration. Therefore, AM fungi have great application potential in the close-to-nature restoration of degraded alpine grasslands.
- Subjects
VESICULAR-arbuscular mycorrhizas; GRASSLAND soils; PLANT diversity; MOUNTAIN meadows; CLIMATE change; PLANT communities; MOUNTAIN plants
- Publication
Mycosystema, 2021, Vol 40, Issue 10, p2562
- ISSN
1672-6472
- Publication type
Article
- DOI
10.13346/j.mycosystema.210262