Abstract
Aims
Wildfires are important disturbances that help to shape the structure and function of forest ecosystems, and arbuscular mycorrhizal fungi (AMF) are key players in the post-fire recovery of soils and understory vegetation. We aimed to investigate the response of AMF communities to wildfire over different timescales.
Methods
Primer set AMV4.5NF/AMDGR was used to amplify soil 18S rRNA gene fragments for the 454 GS-FLX pyrosequencing platform to examine belowground AMF communities 1 and 11 years following low- and high-intensity wildfires in the Greater Khingan Mountains of China.
Results
The majority of AMF sequences detected were annotated as Glomeraceae, Claroideoglomeraceae, Diversisporaceae and Acaulosporaceae. Both AMF community composition and alpha-diversity were correlated with herbaceous and shrubby biomass, available phosphorus (AP) and NH4 +, which were in turn altered by wildfire. AMF community composition, alpha-diversity, and phylogenetic structure were significantly altered 1-year-post-fire. However, AMF communities were indistinguishable from unburned forest soils 11-year-post-fire.
Conclusions
Our results indicated that AMF communities are resilient to wildfire on decadal timescales. This resilience appears to depend on the post-fire regrowth of understory vegetation and the subsequent recovery of soil chemical properties.




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Acknowledgments
We thank Wenhua Cai, Zhihua Liu, Weili Liu and Lei Fang for assistance in sampling. This work was supported by the Strategic Priority Research Program (Grant #XDB15010101) of Chinese Academy of Sciences, National Program on Key Basic Research Project (973 Program, Grant #2014CB954002), and National Natural Science Foundation of China (41371254, 41071121). S.M.G. was supported by an EPA STAR Graduate Fellowship and by the National Institutes of Health Training Grant 5T-32EB-00941. The authors declare no conflicts of interest.
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Xingjia Xiang and Sean M. Gibbons contributed equally to this work.
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Xiang, X., Gibbons, S.M., Yang, J. et al. Arbuscular mycorrhizal fungal communities show low resistance and high resilience to wildfire disturbance. Plant Soil 397, 347–356 (2015). https://doi.org/10.1007/s11104-015-2633-z
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DOI: https://doi.org/10.1007/s11104-015-2633-z