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Estimating methane emissions using vegetation mapping in the taiga–tundra boundary of a north-eastern Siberian lowland

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Title: Estimating methane emissions using vegetation mapping in the taiga–tundra boundary of a north-eastern Siberian lowland
Authors: Morozumi, T. Browse this author
Shingubara, R. Browse this author
Suzuki, R. Browse this author
Kobayashi, H. Browse this author
Tei, S. Browse this author
Takano, S. Browse this author
Fan, R. Browse this author
Liang, M. Browse this author
Maximov, T. C. Browse this author
Sugimoto, A. Browse this author
Keywords: CH4 flux
high-resolution vegetation mapping
remote sensing
chamber flux measurement
Issue Date: 2019
Journal Title: Tellus B: Chemical and Physical Meteorology
Volume: 71
Issue: 1
Start Page: 1
End Page: 17
Publisher DOI: 10.1080/16000889.2019.1581004
Abstract: Taiga–tundra boundary ecosystems are affected by climate change. Methane (CH4) emissions in taiga–tundra boundary ecosystems have sparsely been evaluated from local to regional scales. We linked in situ CH4 fluxes (2009–2016) with vegetation cover, and scaled these findings to estimate CH4 emissions at a local scale (10 10 km) using high-resolution satellite images in an ecosystem on permafrost (Indigirka lowland, northeastern Siberia). We defined nine vegetation classes, containing 71 species, of which 16 were dominant. Distribution patterns were affected by microtopographic height, thaw depth and soil moisture. The Indigirka lowland was covered by willow-dominated dense shrubland and cotton-sedge-dominated wetlands with sparse larch forests. In situ CH4 emissions were high in wetlands. Lakes and rivers were CH4 sources, while forest floors were mostly neutral in terms of CH4 emission. Estimated local CH4 emissions (37mg m 2 d 1) were higher than those reported in similar studies. Our results indicate that: (i) sedge and emergent wetland ecosystems act as hot spots for CH4 emissions, and (ii) sparse tree coverage does not regulate local CH4 emissions and balance. Thus, larch growth and distribution, which are expected to change with climate, do not contribute to decreasing local CH4 emissions.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 両角 友喜

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