期刊
NEW PHYTOLOGIST
卷 194, 期 2, 页码 523-535出版社
WILEY
DOI: 10.1111/j.1469-8137.2012.04050.x
关键词
alpine meadow ecosystem; Elymus nutans; fertilization; functional equilibrium; mycorrhiza; nitrogen; phosphorus; resource availability
资金
- National Basic Research Program of China [2012CB026105]
- National Natural Foundation of China [40930533, 31170482]
- State Key Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences [SKLFSE200901]
- Major Project of Cultivating New Varieties of Transgenic Organisms [2009ZX08009-029B]
- PhD Programs Foundation of the Ministry of Education of China [2010021111002]
- US National Science Foundation [DEB-0842327]
- Fulbright Commission
- Division Of Environmental Biology
- Direct For Biological Sciences [0842327] Funding Source: National Science Foundation
We measured the influences of soil fertility and plant community composition on Glomeromycota, and tested the prediction of the functional equilibrium hypothesis that increased availability of soil resources will reduce the abundance of arbuscular mycorrhizal (AM) fungi. Communities of plants and AM fungi were measured in mixed roots and in Elymus nutans roots across an experimental fertilization gradient in an alpine meadow on the Tibetan Plateau. As predicted, fertilization reduced the abundance of Glomeromycota as well as the species richness of plants and AM fungi. The response of the glomeromycotan community was strongly linked to the plant community shift towards dominance by Elymus nutans. A reduction in the extraradical hyphae of AM fungi was associated with both the changes in soil factors and shifts in the plant community composition that were caused by fertilization. Our findings highlight the importance of soil fertility in regulating both plant and glomeromycotan communities, and emphasize that high fertilizer inputs can reduce the biodiversity of plants and AM fungi, and influence the sustainability of ecosystems.
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