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FEMS Microbiol Ecol. 2015 Jul;91(7). pii: fiv062. doi: 10.1093/femsec/fiv062. Epub 2015 Jun 10.

Microbial ecology in a future climate: effects of temperature and moisture on microbial communities of two boreal fens.

Author information

1
Natural Resources Institute Finland (Luke), FI-01370 Vantaa, Finland krista.peltoniemi@luke.fi.
2
Natural Resources Institute Finland (Luke), FI-39700 Parkano, Finland.
3
Natural Resources Institute Finland (Luke), FI-01370 Vantaa, Finland.
4
Department of Forest Sciences, University of Helsinki, FI-00014 Helsinki, Finland.
5
School of Forest Sciences, Faculty of Science and Forestry, University of Eastern Finland, FI-80101 Joensuu, Finland.

Abstract

Impacts of warming with open-top chambers on microbial communities in wet conditions and in conditions resulting from moderate water-level drawdown (WLD) were studied across 0-50 cm depth in northern and southern boreal sedge fens. Warming alone decreased microbial biomass especially in the northern fen. Impact of warming on microbial PLFA and fungal ITS composition was more obvious in the northern fen and linked to moisture regime and sample depth. Fungal-specific PLFA increased in the surface peat in the drier regime and decreased in layers below 10 cm in the wet regime after warming. OTUs representing Tomentella and Lactarius were observed in drier regime and Mortierella in wet regime after warming in the northern fen. The ectomycorrhizal fungi responded only to WLD. Interestingly, warming together with WLD decreased archaeal 16S rRNA copy numbers in general, and fungal ITS copy numbers in the northern fen. Expectedly, many results indicated that microbial response on warming may be linked to the moisture regime. Results indicated that microbial community in the northern fen representing Arctic soils would be more sensitive to environmental changes. The response to future climate change clearly may vary even within a habitat type, exemplified here by boreal sedge fen.

KEYWORDS:

climate warming; fungi; microbial communities; mycorrhizae; peatland; water-level drawdown

PMID:
26066028
DOI:
10.1093/femsec/fiv062
[Indexed for MEDLINE]

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