Climate Sensitivity of Peatland Methane Emissions Mediated by Seasonal Hydrologic Dynamics.

Autor: Feng X; Department of Civil, Environmental, and Geo- Engineering, University of Minnesota, Twin Cities, Minneapolis, MN, USA.; Saint Anthony Falls Laboratory, University of Minnesota, Twin Cities, Minneapolis, MN, USA., Deventer MJ; Department of Soil, Water, and Climate, University of Minnesota, Twin Cities, Minneapolis, MN, USA., Lonchar R; Department of Civil, Environmental, and Geo- Engineering, University of Minnesota, Twin Cities, Minneapolis, MN, USA.; Saint Anthony Falls Laboratory, University of Minnesota, Twin Cities, Minneapolis, MN, USA., Ng GHC; Saint Anthony Falls Laboratory, University of Minnesota, Twin Cities, Minneapolis, MN, USA.; Department of Earth and Environmental Sciences, University of Minnesota, Twin Cities, Minneapolis, MN, USA., Sebestyen SD; Northern Research Station, USDA Forest Service, St. Paul, MN, USA., Roman DT; Northern Research Station, USDA Forest Service, St. Paul, MN, USA., Griffis TJ; Department of Soil, Water, and Climate, University of Minnesota, Twin Cities, Minneapolis, MN, USA., Millet DB; Department of Soil, Water, and Climate, University of Minnesota, Twin Cities, Minneapolis, MN, USA., Kolka RK; Northern Research Station, USDA Forest Service, St. Paul, MN, USA.
Jazyk: angličtina
Zdroj: Geophysical research letters [Geophys Res Lett] 2020 Sep 16; Vol. 47 (17). Date of Electronic Publication: 2020 Aug 21.
DOI: 10.1029/2020gl088875
Abstrakt: Peatlands are among the largest natural sources of atmospheric methane (CH 4 ) worldwide. Peatland emissions are projected to increase under climate change, as rising temperatures and shifting precipitation accelerate microbial metabolic pathways favorable for CH 4 production. However, how these changing environmental factors will impact peatland emissions over the long term remains unknown. Here, we investigate a novel data set spanning an exceptionally long 11 years to analyze the influence of soil temperature and water table elevation on peatland CH 4 emissions. We show that higher water tables dampen the springtime increases in CH 4 emissions as well as their subsequent decreases during late summer to fall. These results imply that any hydroclimatological changes in northern peatlands that shift seasonal water availability from winter to summer will increase annual CH 4 emissions, even if temperature remains unchanged. Therefore, advancing hydrological understanding in peatland watersheds will be crucial for improving predictions of CH 4 emissions.
Competing Interests: Conflict of Interest The authors declare no competing interests.
Databáze: MEDLINE
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