Drivers of net methane uptake across Greenlandic dry heath tundra landscapes
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Drivers of net methane uptake across Greenlandic dry heath tundra landscapes. / St Pierre, Kyra A.; Danielsen, Birgitte Kortegaard; Hermesdorf, Lena; D'Imperio, Ludovica; Iversen, Lars Lønsmann; Elberling, Bo.
I: Soil Biology and Biochemistry, Bind 138, 107605, 2019.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Drivers of net methane uptake across Greenlandic dry heath tundra landscapes
AU - St Pierre, Kyra A.
AU - Danielsen, Birgitte Kortegaard
AU - Hermesdorf, Lena
AU - D'Imperio, Ludovica
AU - Iversen, Lars Lønsmann
AU - Elberling, Bo
N1 - CENPERM[2019]
PY - 2019
Y1 - 2019
N2 - Methane (CH4) is a potent greenhouse gas that is naturally produced and consumed in soil. The processes result in that soils may function as either a net sink or source of atmospheric methane. Although dry heath tundra ecosystems have recently been identified as important net sinks of atmospheric CH4, we understand little about how similar dry heath sites compare across both elevational gradients and wider geographical areas with regards to CH4 fluxes. To address this shortcoming, we measured CH4 fluxes and soil characteristics under ambient and experimental warming conditions at low and high elevation sites in South (61°N) and West (69°N) Greenland. We then used a structural equation model to explain CH4 fluxes in relation to air temperatures and soil moisture. Soils across all sites were almost universal net CH4 sinks (range for ambient plots: −1.2 to −3.9 μmol m−2 h−1). Observed soil CH4 fluxes across all sites were significantly positively correlated to soil temperatures at 5 cm depth and negatively correlated to soil moisture. Additional factors such as soil pH and disturbance could also help to explain the differences in CH4 fluxes between similar dry heath sites across greater spatial scales. Understanding the importance of these factors is likely critical to more accurately upscale plot-level measurements of CH4 fluxes in constraining the terrestrial high latitude CH4 sink.
AB - Methane (CH4) is a potent greenhouse gas that is naturally produced and consumed in soil. The processes result in that soils may function as either a net sink or source of atmospheric methane. Although dry heath tundra ecosystems have recently been identified as important net sinks of atmospheric CH4, we understand little about how similar dry heath sites compare across both elevational gradients and wider geographical areas with regards to CH4 fluxes. To address this shortcoming, we measured CH4 fluxes and soil characteristics under ambient and experimental warming conditions at low and high elevation sites in South (61°N) and West (69°N) Greenland. We then used a structural equation model to explain CH4 fluxes in relation to air temperatures and soil moisture. Soils across all sites were almost universal net CH4 sinks (range for ambient plots: −1.2 to −3.9 μmol m−2 h−1). Observed soil CH4 fluxes across all sites were significantly positively correlated to soil temperatures at 5 cm depth and negatively correlated to soil moisture. Additional factors such as soil pH and disturbance could also help to explain the differences in CH4 fluxes between similar dry heath sites across greater spatial scales. Understanding the importance of these factors is likely critical to more accurately upscale plot-level measurements of CH4 fluxes in constraining the terrestrial high latitude CH4 sink.
KW - Arctic
KW - Climate change
KW - Greenland
KW - Landscape
KW - Methane oxidation
U2 - 10.1016/j.soilbio.2019.107605
DO - 10.1016/j.soilbio.2019.107605
M3 - Journal article
AN - SCOPUS:85072401421
VL - 138
JO - Soil Biology & Biochemistry
JF - Soil Biology & Biochemistry
SN - 0038-0717
M1 - 107605
ER -
ID: 228154568