Microbial “hotspots” of organic matter decomposition in temperate peatlands are driven by local spatial heterogeneity in abiotic conditions and not by vegetation structure

Briones, Maria J.I.; Juan-Ovejero, Raquel; McNamara, Niall P.; Ostle, Nicholas J.

doi:10.1016/j.soilbio.2021.108501

Cited by 13 publications

(7 citation statements)

References 81 publications

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“…Our results revealed significant correlations between microbial alpha diversity (Chao1 and Shannon) indices and the determined soil parameters (pH,

–N,

–N, and TP), in agreement with other studies for different wetlands (Bickford et al, 2020 ; Briones et al, 2022 ; Kang et al, 2021 ). Soil pH is considered as a strong driver that can shape soil bacterial community structure in various ecosystems, which may influence the physiology, morphology, and metabolism of soil microorganisms (Shanmugam & Kingery, 2018 ).…”

Section: Discussionsupporting

confidence: 92%

Variations in soil microbial community structure and extracellular enzymatic activities along a forest–wetland ecotone in high‐latitude permafrost regions

Xie

et al. 2023

Ecology and Evolution

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“…Our results revealed significant correlations between microbial alpha diversity (Chao1 and Shannon) indices and the determined soil parameters (pH,

–N,

Section: Discussionsupporting

confidence: 92%

Variations in soil microbial community structure and extracellular enzymatic activities along a forest–wetland ecotone in high‐latitude permafrost regions

Xie

et al. 2023

Ecology and Evolution

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“…An ecotone is a transitional zone across different ecosystems that includes characteristic organisms that are unique to the ecotone and elements of both bordering communities, and these zones may be extremely sensitive to global warming [ 10 ]. Abiotic soil factors in forest–peatland ecotones have high spatial heterogeneity even at small scales, which likely results in spatially heterogeneous microbial communities [ 11 ]. Current studies in boreal forests and peatlands have focused on climate change, carbon storage and mineralization, wetland degradation and restoration, and specific microbial communities [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Wang

et al. 2022

IJERPH

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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.

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“…The actinobacterial communities at depths > 1180 cm at VV were significantly different from those at depths ≤ 1000 cm (Table 4, Figure 5C). It is possible that the fungal communities at VV were also different at ≥1180 cm, but as part of the original study rationale, samples were not processed using ITS primers at this depth, as according to the literature, fungi are not expected to play functional roles in deeper layers of peatlands [28]. The comparatively low organic matter concentrations and clay-like consistency of the deep (1180-1200 cm) samples in comparison to the peaty appearance and texture of the other samples from VV strongly suggested that the bed of the peatland had been reached with the sampling equipment 1180 cm below the surface at that particular sampling site at VV.…”

Section: Taxamentioning

confidence: 99%

Impact of Physicochemical Parameters on the Diversity and Distribution of Microbial Communities Associated with Three South African Peatlands

et al. 2022

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Peatlands are complex wetland-like ecosystems that harbor diverse microbial communities. In this study, the microbial communities (fungal and actinobacterial) associated with an unimpacted peatland (Vankervelsvlei; VV), an impacted peatland (Goukou River system; GK), and a developing peatland (Nuwejaars River system; NR) were determined through ITS and 16S rRNA metataxonomic analyses. Unidentified Acidimicrobiales dominated in GK and NR, unidentified Intrasporangiaceae and Solirubobacterales in NR, and Corynebacterium, Propionibacterium, and Streptomyces species in VV. The fungal phyla, Ascomycota and Basidiomycota, dominated all three sites, and harbored unique fungal taxa belonging to a wide range of fungal guilds. Physicochemical properties of the peat collected from the three sites were analyzed in association with microbial community structures in order to determine which parameters acted as the main drivers for microbial diversity. BEST analysis (linking microbial diversity patterns to environmental variables) showed that nitrogen (N), aluminum (Al), phosphorus (P), and potassium (K) were the most significant physicochemical drivers of actinobacterial community structure, while iron (Fe) and humification were the environmental parameters that affected the fungal communities the most. In conclusion, this study has provided some insight into the fungal and actinobacterial communities associated with three South African peatlands and the main environmental drivers that influence these communities.

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Microbial “hotspots” of organic matter decomposition in temperate peatlands are driven by local spatial heterogeneity in abiotic conditions and not by vegetation structure

Cited by 13 publications

References 81 publications

Variations in soil microbial community structure and extracellular enzymatic activities along a forest–wetland ecotone in high‐latitude permafrost regions

Variations in soil microbial community structure and extracellular enzymatic activities along a forest–wetland ecotone in high‐latitude permafrost regions

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

Impact of Physicochemical Parameters on the Diversity and Distribution of Microbial Communities Associated with Three South African Peatlands

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