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Abstract
Sphagnum microbiomes play an important role in the northern peatland ecosystems. However, information about above and belowground microbiomes related to Sphagnum at subtropical area remains largely limited. In this study, microbial communities from Sphagnum palustre peat, S. palustre green part, and S. palustre brown part at the Dajiuhu Peatland, in central China were investigated via 16S rRNA gene amplicon sequencing. Results indicated that Alphaproteobacteria was the dominant class in all samples, and the classes Acidobacteria and Gammaproteobacteria were abundant in S. palustre peat and S. palustre brown part samples, respectively. In contrast, the class Cyanobacteria dominated in S. palustre green part samples. Microhabitat differentiation mainly contributes to structural differences of bacterial microbiome. In the S. palustre peat, microbial communities were significantly shaped by water table and total nitrogen content. Our study is a systematical investigation on above and belowground bacterial microbiome in a subalpine Sphagnum peatland and the results offer new knowledge about the distribution of bacterial microbiome associated with different microhabitats in subtropical area.
Highlights
Peatlands only cover approximately 3% of the Earth’s land surface, but store up to ~30% of the terrestrial carbon and play a critical role in global carbon cycling (Yu et al, 2010; Mitsch et al, 2013)
Bacterial communities are mainly composed of several dominant phyla in a wide range of soil types as well as in peatlands, e.g., Proteobacteria, Acidobacteria, Bacteroidetes, Actinobacteria, and Firmicutes (Griffiths et al, 2016; Karimi et al, 2018; Shi et al, 2018)
A remarkable loss of alpha diversity (e.g., Shannon index from 7.02 in SB to 4.78 in SG) and decrease in total and specific operational taxonomic units (OTUs) (Figures 3A,D) were observed from S. palustre brown part to S. palustre green part which clearly showed a microhabitat differentiation. This differentiation was confirmed by the clustering of community structure based on Principal coordinate analysis (PCoA) (Figure 3B)
Summary
Peatlands only cover approximately 3% of the Earth’s land surface, but store up to ~30% of the terrestrial carbon and play a critical role in global carbon cycling (Yu et al, 2010; Mitsch et al, 2013). Sphagnum-dominated peatlands are widely distributed in the northern hemisphere (Shaw et al, 2010; Jassey et al, 2011; Weston et al, 2015). Sphagnum mosses maintain their dominance through high competition for cation exchange (Soudzilovskaia et al, 2010) and inhibition of growth of other plants attributed to H+ release (Weston et al, 2015; Kostka et al, 2016). Symbiotic methanotrophs and diazotrophs in Sphagnum have been confirmed to significantly
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