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Jing Tang

Researcher

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Acclimation of Biogenic Volatile Organic Compound Emission From Subarctic Heath Under Long-Term Moderate Warming

Author

  • J. Tang
  • H. Valolahti
  • M. Kivimäenpää
  • A. Michelsen
  • R. Rinnan

Summary, in English

Biogenic volatile organic compound (BVOC) emissions from subarctic ecosystems have shown to increase drastically in response to a long-term temperature increase of only 2°C. We assessed whether this increase takes place already after 3 years of warming and how the increase changes over time. To test this, we measured BVOC emissions and CO2 fluxes in a field experiment on a subarctic wet heath, where ecosystem plots were subjected to passive warming by open top chambers for 3 (OTC3) or 13 years (OTC13) or were kept as unmanipulated controls. Already after 3 years of moderate temperature increase of 1–2°C, warming increased the emissions of isoprene (five- to sixfold) and monoterpenes (three- to fourfold) from the subarctic heath. The several-fold higher BVOC emissions in the warmed plots are likely a result of increased vegetation biomass and altered vegetation composition as a shift in the species coverage was observed already after 3 years of warming. Warming also increased gross ecosystem production and ecosystem respiration, but the increases were much lower than those for BVOCs. Our results demonstrate that the strong BVOC responses to warming already appeared after 3 years, and the BVOC and CO2 fluxes had acclimated to this warming after 3 years, showing no differences with another 10 years of warming. This finding has important implications for predicting CO2 and BVOC fluxes in subarctic ecosystems.

Department/s

  • MERGE: ModElling the Regional and Global Earth system

Publishing year

2018-01-01

Language

English

Pages

95-105

Publication/Series

Journal of Geophysical Research - Biogeosciences

Volume

123

Issue

1

Document type

Journal article

Publisher

Wiley

Topic

  • Climate Research

Keywords

  • Arctic
  • BVOC
  • climate change
  • CO exchange
  • isoprene
  • tundra

Status

Published

ISBN/ISSN/Other

  • ISSN: 2169-8953