TY - JOUR

T1 - Methane uptake rates across different soil types and agricultural management practices in Denmark

AU - Hansen, Line Vinther

AU - Brændholt, Andreas

AU - Tariq, Azeem

AU - Jensen, Lars Stoumann

AU - Peixoto, Leanne E.K.

AU - Petersen, Søren O.

AU - Bruun, Sander

N1 - Funding Information: This study was only possible due to the dedicated support from the technicians including Arne Grud, Bodil Stensgaard, Camilla Kaskholt, Fritz Detlefsen, Henrik Nørgaard, Jakob Engstrøm Darré, Jane S. Jakobsen, Jens B. Kjeldsen, Jonas Rasmussen, Lene Skovmose, Margit Paulsen, Mette S. Haferbier, Pia J. Andersen and Kathrine Østergaard, as well as dedicated student assistants Ida Roos Friis and Line Bering. We also thank the farmers for providing us with manure and digestate for experiments. This study is affiliated with NATEF (National emission factor for nitrous oxide gas) and is funded by the Climate Research Program of the Ministry of Food, Agriculture and Fisheries ( 33010- NIFA-19-719 ). Publisher Copyright: © 2024 The Authors

PY - 2024

Y1 - 2024

N2 - Upland terrestrial soils play a crucial role in the global methane (CH4) cycle, although their potential as sinks for CH4 remains inadequately quantified. This study investigated CH4 uptake rates spanning two full years at four locations representing typical soil types and crop rotations in Denmark. The sampling campaigns included a total of more than 5000 manual static chamber flux measurements. All locations were, on average, small net sinks for CH4 while displaying significant differences between locations ranging from −1.5±0.3 g CH4-C ha−1 day−1 on the loamy soils to −3.8±0.3 g CH4-C ha−1 day−1 on the sandy soil with the lowest bulk density. A significant negative effect of soil moisture on CH4 uptake was also identified across the locations. Therefore, this study highlights the importance of soil texture and moisture as key controlling variables for CH4 uptake and emphasizes the need for local estimates of sink capacity. Overall, there were no detectable effects of agricultural management practices and fertilisation events did not affect the CH4 flux except for some high emissions following cattle slurry application on coarse sandy soil, which needs some consideration.

AB - Upland terrestrial soils play a crucial role in the global methane (CH4) cycle, although their potential as sinks for CH4 remains inadequately quantified. This study investigated CH4 uptake rates spanning two full years at four locations representing typical soil types and crop rotations in Denmark. The sampling campaigns included a total of more than 5000 manual static chamber flux measurements. All locations were, on average, small net sinks for CH4 while displaying significant differences between locations ranging from −1.5±0.3 g CH4-C ha−1 day−1 on the loamy soils to −3.8±0.3 g CH4-C ha−1 day−1 on the sandy soil with the lowest bulk density. A significant negative effect of soil moisture on CH4 uptake was also identified across the locations. Therefore, this study highlights the importance of soil texture and moisture as key controlling variables for CH4 uptake and emphasizes the need for local estimates of sink capacity. Overall, there were no detectable effects of agricultural management practices and fertilisation events did not affect the CH4 flux except for some high emissions following cattle slurry application on coarse sandy soil, which needs some consideration.

KW - Crop rotation

KW - Methane

KW - Organic and synthetic fertilisers

KW - Static chambers

U2 - 10.1016/j.agee.2023.108878

DO - 10.1016/j.agee.2023.108878

M3 - Journal article

AN - SCOPUS:85183709381

VL - 363

JO - Applied Soil Ecology

JF - Applied Soil Ecology

SN - 0929-1393

M1 - 108878

ER -