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

Ekberg, Anna LU ; Arneth, Almut LU and Holst, Thomas LU (2011) In Boreal Environment Research: An International Interdisciplinary Journal 16(1). p.47-59
Abstract
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... (More)
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. (Less)
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organization
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Contribution to journal
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published
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in
Boreal Environment Research: An International Interdisciplinary Journal
volume
16
issue
1
pages
47 - 59
publisher
Finnish Zoological and Botanical Publishing Board
external identifiers
  • wos:000287958600004
  • scopus:79952530338
ISSN
1239-6095
project
MERGE
BECC
language
English
LU publication?
yes
id
b6f8b468-24ce-471e-8ff2-8b6710e73864 (old id 1744991)
alternative location
http://www.borenv.net/BER/pdfs/ber16/ber16-047.pdf
date added to LUP
2011-07-11 11:03:34
date last changed
2017-10-01 04:14:09
@article{b6f8b468-24ce-471e-8ff2-8b6710e73864,
  abstract     = {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.},
  author       = {Ekberg, Anna and Arneth, Almut and Holst, Thomas},
  issn         = {1239-6095},
  language     = {eng},
  number       = {1},
  pages        = {47--59},
  publisher    = {Finnish Zoological and Botanical Publishing Board},
  series       = {Boreal Environment Research: An International Interdisciplinary Journal},
  title        = {Isoprene emission from Sphagnum species occupying different growth positions above the water table},
  volume       = {16},
  year         = {2011},
}