Methane oxidation in contrasting soil types: responses to experimental warming with implication for landscape-integrated CH4 budget

Ludovica D'Imperio; Cecilie Skov Nielsen; Andreas Westergaard-Nielsen; Anders Michelsen; Bo Elberling

doi:10.1111/gcb.13400

Methane oxidation in contrasting soil types: responses to experimental warming with implication for landscape-integrated CH₄ budget

Ludovica D'Imperio, Cecilie Skov Nielsen, Andreas Westergaard-Nielsen, Anders Michelsen, Bo Elberling^*

^*Corresponding author af dette arbejde

26 Citationer (Scopus)

172 Downloads (Pure)

Abstract

Arctic ecosystems are characterized by a wide range of soil moisture conditions and thermal regimes and contribute differently to the net methane (CH₄) budget. Yet, it is unclear how climate change will affect the capacity of those systems to act as a net source or sink of CH₄. Here, we present results of in situ CH₄ flux measurements made during the growing season 2014 on Disko Island (west Greenland) and quantify the contribution of contrasting soil and landscape types to the net CH₄ budget and responses to summer warming. We compared gas flux measurements from a bare soil and a dry heath, at ambient conditions and increased air temperature, using open-top chambers (OTCs). Throughout the growing season, bare soil consumed 0.22 ± 0.03 g CH₄-C m⁻² (8.1 ± 1.2 g CO₂-eq m⁻²) at ambient conditions, while the dry heath consumed 0.10 ± 0.02 g CH₄-C m⁻² (3.9 ± 0.6 g CO₂-eq m⁻²). These uptake rates were subsequently scaled to the entire study area of 0.15 km², a landscape also consisting of wetlands with a seasonally integrated methane release of 0.10 ± 0.01 g CH₄-C m⁻² (3.7 ± 1.2 g CO₂-eq m⁻²). The result was a net landscape sink of 12.71 kg CH₄-C (0.48 tonne CO₂-eq) during the growing season. A nonsignificant trend was noticed in seasonal CH₄ uptake rates with experimental warming, corresponding to a 2% reduction at the bare soil, and 33% increase at the dry heath. This was due to the indirect effect of OTCs on soil moisture, which exerted the main control on CH₄ fluxes. Overall, the net landscape sink of CH₄ tended to increase by 20% with OTCs. Bare and dry tundra ecosystems should be considered in the net CH₄ budget of the Arctic due to their potential role in counterbalancing CH₄ emissions from wetlands – not the least when taking the future climatic scenarios of the Arctic into account.

Originalsprog	Engelsk
Tidsskrift	Global Change Biology
Vol/bind	23
Udgave nummer	2
Sider (fra-til)	966-976
Antal sider	11
ISSN	1354-1013
DOI	https://doi.org/10.1111/gcb.13400
Status	Udgivet - 2017

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10.1111/gcb.13400Licens: CC BY

Methane oxidation in contrasting soil types responses to experimental warming with implication for landscape-integrated CH4 budgetForlagets udgivne version, 332 KBLicens: CC BY

Citationsformater

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title = "Methane oxidation in contrasting soil types: responses to experimental warming with implication for landscape-integrated CH4 budget",

abstract = "Arctic ecosystems are characterized by a wide range of soil moisture conditions and thermal regimes and contribute differently to the net methane (CH4) budget. Yet, it is unclear how climate change will affect the capacity of those systems to act as a net source or sink of CH4. Here, we present results of in situ CH4 flux measurements made during the growing season 2014 on Disko Island (west Greenland) and quantify the contribution of contrasting soil and landscape types to the net CH4 budget and responses to summer warming. We compared gas flux measurements from a bare soil and a dry heath, at ambient conditions and increased air temperature, using open-top chambers (OTCs). Throughout the growing season, bare soil consumed 0.22 ± 0.03 g CH4-C m−2 (8.1 ± 1.2 g CO2-eq m−2) at ambient conditions, while the dry heath consumed 0.10 ± 0.02 g CH4-C m−2 (3.9 ± 0.6 g CO2-eq m−2). These uptake rates were subsequently scaled to the entire study area of 0.15 km2, a landscape also consisting of wetlands with a seasonally integrated methane release of 0.10 ± 0.01 g CH4-C m−2 (3.7 ± 1.2 g CO2-eq m−2). The result was a net landscape sink of 12.71 kg CH4-C (0.48 tonne CO2-eq) during the growing season. A nonsignificant trend was noticed in seasonal CH4 uptake rates with experimental warming, corresponding to a 2% reduction at the bare soil, and 33% increase at the dry heath. This was due to the indirect effect of OTCs on soil moisture, which exerted the main control on CH4 fluxes. Overall, the net landscape sink of CH4 tended to increase by 20% with OTCs. Bare and dry tundra ecosystems should be considered in the net CH4 budget of the Arctic due to their potential role in counterbalancing CH4 emissions from wetlands – not the least when taking the future climatic scenarios of the Arctic into account.",

keywords = "Arctic, bare soil, dry heath, Greenland, methane budget, methane uptake, soil moisture, warming",

author = "Ludovica D'Imperio and Nielsen, {Cecilie Skov} and Andreas Westergaard-Nielsen and Anders Michelsen and Bo Elberling",

note = "CENPERMOA[2017]",

year = "2017",

doi = "10.1111/gcb.13400",

language = "English",

volume = "23",

pages = "966--976",

journal = "Global Change Biology",

issn = "1354-1013",

publisher = "Wiley-Blackwell",

number = "2",

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TY - JOUR

T1 - Methane oxidation in contrasting soil types

T2 - responses to experimental warming with implication for landscape-integrated CH4 budget

AU - D'Imperio, Ludovica

AU - Nielsen, Cecilie Skov

AU - Westergaard-Nielsen, Andreas

AU - Michelsen, Anders

AU - Elberling, Bo

N1 - CENPERMOA[2017]

PY - 2017

Y1 - 2017

N2 - Arctic ecosystems are characterized by a wide range of soil moisture conditions and thermal regimes and contribute differently to the net methane (CH4) budget. Yet, it is unclear how climate change will affect the capacity of those systems to act as a net source or sink of CH4. Here, we present results of in situ CH4 flux measurements made during the growing season 2014 on Disko Island (west Greenland) and quantify the contribution of contrasting soil and landscape types to the net CH4 budget and responses to summer warming. We compared gas flux measurements from a bare soil and a dry heath, at ambient conditions and increased air temperature, using open-top chambers (OTCs). Throughout the growing season, bare soil consumed 0.22 ± 0.03 g CH4-C m−2 (8.1 ± 1.2 g CO2-eq m−2) at ambient conditions, while the dry heath consumed 0.10 ± 0.02 g CH4-C m−2 (3.9 ± 0.6 g CO2-eq m−2). These uptake rates were subsequently scaled to the entire study area of 0.15 km2, a landscape also consisting of wetlands with a seasonally integrated methane release of 0.10 ± 0.01 g CH4-C m−2 (3.7 ± 1.2 g CO2-eq m−2). The result was a net landscape sink of 12.71 kg CH4-C (0.48 tonne CO2-eq) during the growing season. A nonsignificant trend was noticed in seasonal CH4 uptake rates with experimental warming, corresponding to a 2% reduction at the bare soil, and 33% increase at the dry heath. This was due to the indirect effect of OTCs on soil moisture, which exerted the main control on CH4 fluxes. Overall, the net landscape sink of CH4 tended to increase by 20% with OTCs. Bare and dry tundra ecosystems should be considered in the net CH4 budget of the Arctic due to their potential role in counterbalancing CH4 emissions from wetlands – not the least when taking the future climatic scenarios of the Arctic into account.

AB - Arctic ecosystems are characterized by a wide range of soil moisture conditions and thermal regimes and contribute differently to the net methane (CH4) budget. Yet, it is unclear how climate change will affect the capacity of those systems to act as a net source or sink of CH4. Here, we present results of in situ CH4 flux measurements made during the growing season 2014 on Disko Island (west Greenland) and quantify the contribution of contrasting soil and landscape types to the net CH4 budget and responses to summer warming. We compared gas flux measurements from a bare soil and a dry heath, at ambient conditions and increased air temperature, using open-top chambers (OTCs). Throughout the growing season, bare soil consumed 0.22 ± 0.03 g CH4-C m−2 (8.1 ± 1.2 g CO2-eq m−2) at ambient conditions, while the dry heath consumed 0.10 ± 0.02 g CH4-C m−2 (3.9 ± 0.6 g CO2-eq m−2). These uptake rates were subsequently scaled to the entire study area of 0.15 km2, a landscape also consisting of wetlands with a seasonally integrated methane release of 0.10 ± 0.01 g CH4-C m−2 (3.7 ± 1.2 g CO2-eq m−2). The result was a net landscape sink of 12.71 kg CH4-C (0.48 tonne CO2-eq) during the growing season. A nonsignificant trend was noticed in seasonal CH4 uptake rates with experimental warming, corresponding to a 2% reduction at the bare soil, and 33% increase at the dry heath. This was due to the indirect effect of OTCs on soil moisture, which exerted the main control on CH4 fluxes. Overall, the net landscape sink of CH4 tended to increase by 20% with OTCs. Bare and dry tundra ecosystems should be considered in the net CH4 budget of the Arctic due to their potential role in counterbalancing CH4 emissions from wetlands – not the least when taking the future climatic scenarios of the Arctic into account.

KW - Arctic

KW - bare soil

KW - dry heath

KW - Greenland

KW - methane budget

KW - methane uptake

KW - soil moisture

KW - warming

U2 - 10.1111/gcb.13400

DO - 10.1111/gcb.13400

M3 - Journal article

C2 - 27416869

AN - SCOPUS:84978370259

SN - 1354-1013

VL - 23

SP - 966

EP - 976

JO - Global Change Biology

JF - Global Change Biology

IS - 2

ER -