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Isoprene emission from Sphagnum species occupying different growth positions above the water table

  • Anna Ekberg
  • Almut Arneth
  • Thomas Holst
Publishing year: 2011
Language: English
Pages: 47-59
Publication/Series: Boreal Environment Research: An International Interdisciplinary Journal
Volume: 16
Issue: 1
Document type: Journal article
Publisher: Finnish Zoological and Botanical Publishing Board

Abstract english

Isoprene emission from Sphagnum species naturally growing at different positions above the water table were measured in a subarctic peatland and at monoliths from a temperate bog. Our objectives were to investigate (1) whether emission rates were species and/or moisture dependent, and (2) whether short-term temperature history had an influence on emission capacity. We expected greater emission capacities in moist than dry growing conditions, and from species adapted to wet habitats. We also expected that higher emission capacities would be found in response to elevated temperatures. Average peak growing season isoprene emission capacities (standardized to 20 degrees C and PAR 1000 mu mol m(-2) s(-1)) at the subarctic site were 106 and 74 mu g C m(-2) h(-1) from a S. balticum wet lawn and a S. balticum dry hummock/palsa, respectively. Emission capacities correlated strongly with gross primary productivity (GPP) and the average air temperature of the 48 hours prior to measurement (T-48), but the effect of T-48 seemed to be partly masked by the influence of GPP when moisture was not limiting. The laboratory experiments suggested that a typical hummock species, S. rubellum had higher capacity for isoprene emission than a typical lawn species S. magellanicum. Instantaneous emission rates increased with temperature, but no effect of temperature history was discernible. Sphagnum mosses are known to emit substantial amounts of isoprene, but in this study we also showed significant inter-species differences in emission capacity. The results imply that climate change induced alterations of peatland hydrology may change the total ecosystem isoprene source strength, as individual species adapt to new growth conditions or as a consequence of species succession.


  • Physical Geography


  • ISSN: 1239-6095
E-mail: thomas [dot] holst [at] nateko [dot] lu [dot] se


Dept of Physical Geography and Ecosystem Science

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Dept of Physical Geography and Ecosystem Science


Department of Physical Geography and Ecosystem Science
Lund University
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S-223 62 Lund

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