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Diversity and Distribution Characteristics of Soil Microbes across Forest–Peatland Ecotones in the Permafrost Regions

Author

Listed:
  • Lin Liu

    (College of Geographical Sciences, Harbin Normal University, Harbin 150025, China)

  • Zhongliang Wang

    (College of Geographical Sciences, Harbin Normal University, Harbin 150025, China)

  • Dalong Ma

    (College of Geographical Sciences, Harbin Normal University, Harbin 150025, China)

  • Man Zhang

    (College of Geographical Sciences, Harbin Normal University, Harbin 150025, China)

  • Lingyu Fu

    (College of Geographical Sciences, Harbin Normal University, Harbin 150025, China)

Abstract

Permafrost peatlands are a huge carbon pool that is uniquely sensitive to global warming. However, despite the importance of peatlands in global carbon sequestration and biogeochemical cycles, few studies have characterized the distribution characteristics and drivers of soil microbial community structure in forest–peatland ecotones. Here, we investigated the vertical distribution patterns of soil microbial communities in three typical peatlands along an environmental gradient using Illumina high-throughput sequencing. Our findings indicated that bacterial richness and diversity decreased with increasing soil depth in coniferous swamp (LT) and thicket swamp (HT), whereas the opposite trend was observed in a tussock swamp (NT). Additionally, these parameters decreased at 0–20 and 20–40 cm and increased at 40–60 cm along the environmental gradient (LT to NT). Principal coordinate analysis (PCoA) indicated that the soil microbial community structure was more significantly affected by peatland type than soil depth. Actinomycetota, Proteobacteria, Firmicutes, Chloroflexota, Acidobacteriota, and Bacteroidota were the predominant bacterial phyla across all soil samples. Moreover, there were no significant differences in the functional pathways between the three peatlands at each depth, except for amino acid metabolism, membrane transport, cell motility, and signal transduction. Redundancy analysis (RDA) revealed that pH and soil water content were the primary environmental factors influencing the bacterial community structure. Therefore, this study is crucial to accurately forecast potential changes in peatland ecosystems and improve our understanding of the role of peat microbes as carbon pumps in the process of permafrost degradation.

Suggested Citation

  • Lin Liu & Zhongliang Wang & Dalong Ma & Man Zhang & Lingyu Fu, 2022. "Diversity and Distribution Characteristics of Soil Microbes across Forest–Peatland Ecotones in the Permafrost Regions," IJERPH, MDPI, vol. 19(22), pages 1-15, November.
  • Handle: RePEc:gam:jijerp:v:19:y:2022:i:22:p:14782-:d:968561
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    References listed on IDEAS

    as
    1. Xiangwen Wu & Shuying Zang & Dalong Ma & Jianhua Ren & Qiang Chen & Xingfeng Dong, 2019. "Emissions of CO 2 , CH 4 , and N 2 O Fluxes from Forest Soil in Permafrost Region of Daxing’an Mountains, Northeast China," IJERPH, MDPI, vol. 16(16), pages 1-14, August.
    2. Dimitrov, Dimitre D. & Bhatti, Jagtar S. & Grant, Robert F., 2014. "The transition zones (ecotone) between boreal forests and peatlands: Modelling water table along a transition zone between upland black spruce forest and poor forested fen in central Saskatchewan," Ecological Modelling, Elsevier, vol. 274(C), pages 57-70.
    3. Dimitrov, Dimitre D. & Bhatti, Jagtar S. & Grant, Robert F., 2014. "The transition zones (ecotone) between boreal forests and peatlands: Ecological controls on ecosystem productivity along a transition zone between upland black spruce forest and a poor forested fen in," Ecological Modelling, Elsevier, vol. 291(C), pages 96-108.
    4. Dandan Song & Yuanquan Cui & Dalong Ma & Xin Li & Lin Liu, 2022. "Spatial Variation of Microbial Community Structure and Its Driving Environmental Factors in Two Forest Types in Permafrost Region of Greater Xing′an Mountains," Sustainability, MDPI, vol. 14(15), pages 1-15, July.
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