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Degradation Reduces Microbial Richness and Alters Microbial Functions in an Australian Peatland

Journal Article · · Microbial Ecology

Abstract

Peatland ecosystems cover only 3% of the world’s land area; however, they store one-third of the global soil carbon (C). Microbial communities are the main drivers of C decomposition in peatlands, yet we have limited knowledge of their structure and function. While the microbial communities in the Northern Hemisphere peatlands are well documented, we have limited understanding of microbial community composition and function in the Southern Hemisphere peatlands, especially in Australia. We investigated the vertical stratification of prokaryote and fungal communities from Wellington Plains peatland in the Australian Alps. Within the peatland complex, bog peat was sampled from the intact peatland and dried peat from the degraded peatland along a vertical soil depth gradient (i.e., acrotelm, mesotelm, and catotelm). We analyzed the prokaryote and fungal community structure, predicted functional profiles of prokaryotes using PICRUSt, and assigned soil fungal guilds using FUNGuild. We found that the structure and function of prokaryotes were vertically stratified in the intact bog. Soil carbon, manganese, nitrogen, lead, and sodium content best explained the prokaryote composition. Prokaryote richness was significantly higher in the intact bog acrotelm compared to degraded bog acrotelm. Fungal composition remained similar across the soil depth gradient; however, there was a considerable increase in saprotroph abundance and decrease in endophyte abundance along the vertical soil depth gradient. The abundance of saprotrophs and plant pathogens was two-fold higher in the degraded bog acrotelm. Soil manganese and nitrogen content, electrical conductivity, and water table level (cm) best explained the fungal composition. Our results demonstrate that both fungal and prokaryote communities are shaped by soil abiotic factors and that peatland degradation reduces microbial richness and alters microbial functions. Thus, current and future changes to the environmental conditions in these peatlands may lead to altered microbial community structures and associated functions which may have implications for broader ecosystem function changes in peatlands.

Sponsoring Organization:
USDOE
OSTI ID:
1877428
Alternate ID(s):
OSTI ID: 2422806
Journal Information:
Microbial Ecology, Journal Name: Microbial Ecology Journal Issue: 3 Vol. 85; ISSN 0095-3628
Publisher:
Springer Science + Business MediaCopyright Statement
Country of Publication:
United States
Language:
English

References (79)

Conceptual frameworks in peatland ecohydrology: looking beyond the two-layered (acrotelm-catotelm) model journal January 2011
Microbial diversity of Minnesota peatlands journal October 1983
Comparison of Bacterial Communities in New England Sphagnum Bogs Using Terminal Restriction Fragment Length Polymorphism (T-RFLP) journal May 2006
Methane-Oxidizing Bacteria in a Finnish Raised Mire Complex: Effects of Site Fertility and Drainage journal October 2005
Insights into the Phylogeny and Metabolic Potential of a Primary Tropical Peat Swamp Forest Microbial Community by Metagenomic Analysis journal November 2010
Peatland Microbial Community Composition Is Driven by a Natural Climate Gradient journal May 2020
Regulation of Decomposition and Methane Dynamics across Natural, Commercially Mined, and Restored Northern Peatlands journal August 2007
Structural and functional differentiation of the microbial community in the surface and subsurface peat of two minerotrophic fens in China journal February 2019
Functional Metagenomics of Methylotrophs book January 2011
Occurrence and Mechanisms of Microbial Oxidation of Manganese book January 1988
Dissimilatory Fe(III) and Mn(IV) Reduction book January 2004
Distribution of potential CO2 and CH4 productions, denitrification and microbial biomass C and N in the profileof a restored peatland in Brittany (France) journal July 2000
Bacterial diversity and community structure along different peat soils in boreal forest journal February 2014
Fungal diversity in peatlands and its contribution to carbon cycling journal February 2020
The FungiResp method: An application of the MicroResp™ method to assess fungi in microbial communities as soil biological indicators journal December 2012
The impact of long-term water level draw-down on microbial biomass: A comparative study from two peatland sites with different nutrient status journal May 2017
FUNGuild: An open annotation tool for parsing fungal community datasets by ecological guild journal April 2016
Vertical distribution of fungi in hollows and hummocks of boreal peatlands journal June 2017
Delving into the dark ecology: A continent-wide assessment of patterns of composition in soil fungal communities from Australian tussock grasslands journal June 2019
Diffusion and mass flow of dissolved carbon dioxide, methane, and dissolved organic carbon in a 7-m deep raised peat bog journal April 2008
The link between peat hydrology and decomposition: Beyond von Post journal February 2013
Habitat diversity of central European fens in relation to environmental gradients and an effort to standardise fen terminology in ecological studies journal December 2006
Comparative analysis of soil microbial communities and their responses to the short-term drought in bog, fen, and riparian wetlands journal November 2008
Indirect regulation of heterotrophic peat soil respiration by water level via microbial community structure and temperature sensitivity journal April 2009
How water-level drawdown modifies litter-decomposing fungal and actinobacterial communities in boreal peatlands journal August 2012
Microbial communities in natural and disturbed peatlands: A review journal February 2013
Current disturbance and the diminishing peatland carbon sink journal January 2002
Organic Matter Chemistry Drives Carbon Dioxide Production of Peatlands journal September 2021
An improved Greengenes taxonomy with explicit ranks for ecological and evolutionary analyses of bacteria and archaea journal December 2011
Temperature sensitivity of soil carbon decomposition and feedbacks to climate change journal March 2006
Large tundra methane burst during onset of freezing journal December 2008
Carbon respiration from subsurface peat accelerated by climate warming in the subarctic journal July 2009
DADA2: High-resolution sample inference from Illumina amplicon data journal May 2016
Dimensions of biodiversity in the Earth mycobiome journal June 2016
Reproducible, interactive, scalable and extensible microbiome data science using QIIME 2 journal July 2019
Occurrence of Vesicular Mycorrhizal Fungi in Dryland Species of Restionaceae and Cyperaceae From South-West Western Australia journal January 1993
Assessing the extent of decomposition of natural organic materials using solid-state 13C NMR spectroscopy journal January 1997
Chemical characterisation of bog peat and dried peat of the Australian Alps journal January 2005
Global patterns of 16S rRNA diversity at a depth of millions of sequences per sample journal June 2010
Genes from mycoparasitic fungi as a source for improving plant resistance to fungal pathogens journal July 1998
The Limits to Peat Bog Growth journal January 1984
PICRUSt2: An improved and extensible approach for metagenome inference posted_content January 2019
Carbon decomposition processes in a peat from the Australian Alps journal April 2010
Carbon chemistry and mineralization of peat soils from the Australian Alps journal February 2012
Effects of short- and long-term water-level drawdown on the populations and activity of aerobic decomposers in a boreal peatland journal February 2007
Accumulation and attrition of peat soils in the Australian Alps: Isotopic dating evidence: ACCUMULATION AND ATTRITION OF PEAT journal November 2011
Resource availability controls fungal diversity across a plant diversity gradient: Resource availability controls fungal diversity journal September 2006
Responses of aerobic microbial communities and soil respiration to water-level drawdown in a northern boreal fen journal February 2008
UNITE: a database providing web-based methods for the molecular identification of ectomycorrhizal fungi: Methods journal March 2005
Interactions among fungal community structure, litter decomposition and depth of water table in a cutover peatland: Fungi, litter and water table on a cutover peatland journal April 2008
Summer drought decreases soil fungal diversity and associated phenol oxidase activity in upland Calluna heathland soil: Summer drought effects on heathland fungi journal November 2008
New primers to amplify the fungal ITS2 region - evaluation by 454-sequencing of artificial and natural communities journal July 2012
Microbial oxidation and reduction of manganese: Consequences in groundwater and applications journal August 1994
Plant species richness and productivity determine the diversity of soil fungal guilds in temperate coniferous forest and bog habitats journal August 2017
Peatland microbial community responses to plant functional group and drought are depth‐dependent journal September 2021
Sebacinales – one thousand and one interactions with land plants journal February 2016
Evolutionary history of mycorrhizal symbioses and global host plant diversity journal January 2018
Global diversity and geography of soil fungi journal November 2014
Microbial Community Stratification Linked to Utilization of Carbohydrates and Phosphorus Limitation in a Boreal Peatland at Marcell Experimental Forest, Minnesota, USA journal March 2014
Microbial Metabolic Potential for Carbon Degradation and Nutrient (Nitrogen and Phosphorus) Acquisition in an Ombrotrophic Peatland journal March 2014
Distinct Anaerobic Bacterial Consumers of Cellobiose-Derived Carbon in Boreal Fens with Different CO 2 /CH 4 Production Ratios journal December 2016
Differential Utilization of Carbon Substrates by Bacteria and Fungi in Tundra Soil journal April 2009
Phylogenetic Analysis and In Situ Identification of Bacteria Community Composition in an Acidic Sphagnum Peat Bog journal March 2006
Methanogens and the diversity of archaebacteria journal March 1987
Methanotrophic bacteria. journal January 1996
Biology of Iron-and Manganese-Depositing Bacteria journal October 1984
Optimizing taxonomic classification of marker-gene amplicon sequences with QIIME 2’s q2-feature-classifier plugin journal May 2018
FastTree 2 – Approximately Maximum-Likelihood Trees for Large Alignments journal March 2010
phyloseq: An R Package for Reproducible Interactive Analysis and Graphics of Microbiome Census Data journal April 2013
lmerTest Package: Tests in Linear Mixed Effects Models journal January 2017
Associations between species and groups of sites: indices and statistical inference journal December 2009
Red yeasts from leaf surfaces and other habitats: three new species and a new combination of Symmetrospora ( Pucciniomycotina , Cystobasidiomycetes ) journal June 2020
Vertical micro-distribution of microbial communities living in Sphagnum fallax journal April 2016
Primer and platform effects on 16S rRNA tag sequencing journal August 2015
Microbial Community Structure in a Malaysian Tropical Peat Swamp Forest: The Influence of Tree Species and Depth journal December 2018
A re-evaluation of Hypochnicium (Polyporales) based on morphological and molecular characters journal November 2010
Diversity and function of fungi in peatlands: A carbon cycling perspective journal March 2006
Microbial biomass and production associated with decaying leaf litter of the emergent macrophyte Juncus effusus journal June 2000
Switch of fungal to bacterial degradation in natural, drained and rewetted oligotrophic peatlands reflected in δ15N and fatty acid composition journal January 2020