Investigating drivers of microbial activity and respiration in a forested bog

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Investigating drivers of microbial activity and respiration in a forested bog

REWCASTLE, Kenna E. (author): University of Vermont,University of Tennessee

MOORE, Jessica A.M. (author): University of Tennessee

HENNING, Jeremiah A. (author): University of Tennessee,University of South Alabama

MAYES, Melanie A. (author): Oak Ridge National Laboratory

PATTERSON, Courtney M. (author): University of Tennessee

WANG, Gangsheng (author): University of Oklahoma

METCALFE, Daniel B. (author): Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science

CLASSEN, Aimée T. (author): University of Tennessee,University of Vermont

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(creator_code:org_t)

2020
2020
English 11 s.
In: Pedosphere. - 1002-0160. ; 30:1, s. 135-145

Related links:: http://dx.doi.org/10...; show more...; https://lup.lub.lu.s...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Northern peatlands store nearly one-third of terrestrial carbon (C) stocks while covering only 3% of the global landmass; nevertheless, the drivers of C cycling in these often-waterlogged ecosystems are different from those that control C dynamics in upland forested soils. To explore how multiple abiotic and biotic characteristics of bogs interact to shape microbial activity in a northern, forested bog, we added a labile C tracer (13C-labeled starch) to in situ peat mesocosms and correlated heterotrophic respiration with natural variation in several microbial predictor variables, such as enzyme activity and microbial biomass, as well as with a suite of abiotic variables and proximity to vascular plants aboveground. We found that peat moisture content was positively correlated with respiration and microbial activity, even when moisture levels exceeded total saturation, suggesting that access to organic matter substrates in drier environments may be limiting for microbial activity. Proximity to black spruce trees decreased total and labile heterotrophic respiration. This negative relationship may reflect the influence of tree evapotranspiration and peat shading effects; i.e., microbial activity may decline as peat dries and cools near trees. Here, we isolated the response of heterotrophic respiration to explore the variation in, and interactions among, multiple abiotic and biotic drivers that influence microbial activity. This approach allowed us to reveal the relative influence of individual drivers on C respiration in these globally important C sinks.

Subject headings

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)

Keyword

carbon cycling
enzyme activity
heterotrophic respiration
labile carbon respiration
ombrotrophic bog
peat moisture
plant proximity
soil carbon sink

Publication and Content Type

art (subject category)
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By the author/editor: REWCASTLE, Kenna ...; MOORE, Jessica A ...; HENNING, Jeremia ...; MAYES, Melanie A ...; PATTERSON, Court ...; WANG, Gangsheng; show more...; METCALFE, Daniel ...; CLASSEN, Aimée T ...; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Physical Geograp ...

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Microbiology

Articles in the publication: Pedosphere

By the university: Lund University

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