Abstract
Soil microbial communities follow distinct seasonal cycles which result in drastic changes in processes involving soil nutrient availability. The biomass of fungi has been reported to be highest during winter, but is fungal growth really occurring in frozen soil? And what is the effect of plant cover on biomass formation and on the composition of fungal communities? To answer these questions, we monitored microbial biomass N, ergosterol, and the amount of fungal hyphae during summer and winter in vegetated and unvegetated soils of an alpine primary successional habitat. The winter fungal communities were identified by rDNA ITS clone libraries. Winter soil temperatures ranged between −0.6°C and −0.1°C in snow-covered soil. We found distinct seasonal patterns for all biomass parameters, with highest biomass concentrations during winter in snow-covered soil. The presence of plant cover had a significant positive effect on the amount of biomass in the soil, but the type of plant cover (plant species) was not a significant factor. A mean hyphal ingrowth of 5.6 m g−1 soil was detected in snow-covered soil during winter, thus clearly proving fungal growth during winter in snow-covered soil. Winter fungal communities had a typical species composition: saprobial fungi were dominating, among them many basidiomycete yeasts. Plant cover had no influence on the composition of winter fungal communities.
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Acknowledgments
This study was funded by the FWF Project P17910-B03 “Seasonal dynamics of underground fungal communities in an alpine environment.” Thanks to Margit Bacher, Margreth Fleisch, and Oliver Mühlmann for their assistance with sampling and to Rüdiger Kaufmann for soil temperature and moisture.
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Supplementary Table 1
Fungal taxa (OTUs) recovered in ingrowth mesh bags buried during winter in snow-covered soil with Kobresia, Polygonum, or Salix vegetation or in unvegetated soil. OTUs were identified based on 97% rDNA ITS sequence similarities. OTUs with lower sequence homology were identified on genus level or on a lower taxonomic rank. The GenBank accession number, similarity, and BLAST score are provided for the best BLAST match. OTUs are sorted based on abundances (number of clones). (DOC 270 kb)
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Kuhnert, R., Oberkofler, I. & Peintner, U. Fungal Growth and Biomass Development is Boosted by Plants in Snow-Covered Soil. Microb Ecol 64, 79–90 (2012). https://doi.org/10.1007/s00248-011-0001-y
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DOI: https://doi.org/10.1007/s00248-011-0001-y