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Longer growing seasons do not increase net carbon uptake in the northeastern Siberian tundra

Parmentier, Frans-Jan LU ; van der Molen, M. K.; van Huissteden, J.; Karsanaev, S. A.; Kononov, A. V.; Suzdalov, D. A.; Maximov, T. C. and Dolman, A. J. (2011) In Journal of Geophysical Research 116. p.04013-04013
Abstract
With global warming, snowmelt is occurring earlier and growing seasons are becoming longer around the Arctic. It has been suggested that this would lead to more uptake of carbon due to a lengthening of the period in which plants photosynthesize. To investigate this suggestion, 8 consecutive years of eddy covariance measurements at a northeastern Siberian graminoid tundra site were investigated for patterns in net ecosystem exchange, gross primary production (GPP) and ecosystem respiration (R-eco). While GPP showed no clear increase with longer growing seasons, it was significantly increased in warmer summers. Due to these warmer temperatures however, the increase in uptake was mostly offset by an increase in R-eco. Therefore, overall... (More)
With global warming, snowmelt is occurring earlier and growing seasons are becoming longer around the Arctic. It has been suggested that this would lead to more uptake of carbon due to a lengthening of the period in which plants photosynthesize. To investigate this suggestion, 8 consecutive years of eddy covariance measurements at a northeastern Siberian graminoid tundra site were investigated for patterns in net ecosystem exchange, gross primary production (GPP) and ecosystem respiration (R-eco). While GPP showed no clear increase with longer growing seasons, it was significantly increased in warmer summers. Due to these warmer temperatures however, the increase in uptake was mostly offset by an increase in R-eco. Therefore, overall variability in net carbon uptake was low, and no relationship with growing season length was found. Furthermore, the highest net uptake of carbon occurred with the shortest and the coldest growing season. Low uptake of carbon mostly occurred with longer or warmer growing seasons. We thus conclude that the net carbon uptake of this ecosystem is more likely to decrease rather than to increase under a warmer climate. These results contradict previous research that has showed more net carbon uptake with longer growing seasons. We hypothesize that this difference is due to site-specific differences, such as climate type and soil, and that changes in the carbon cycle with longer growing seasons will not be uniform around the Arctic. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Geophysical Research
volume
116
pages
04013 - 04013
publisher
American Geophysical Union
external identifiers
  • wos:000296331000001
  • scopus:80155130048
ISSN
2156-2202
DOI
10.1029/2011JG001653
language
English
LU publication?
yes
id
0e4a2c5d-f439-4a12-999c-1c3001f094b7 (old id 2208302)
date added to LUP
2011-11-28 12:56:05
date last changed
2017-10-22 03:14:18
@article{0e4a2c5d-f439-4a12-999c-1c3001f094b7,
  abstract     = {With global warming, snowmelt is occurring earlier and growing seasons are becoming longer around the Arctic. It has been suggested that this would lead to more uptake of carbon due to a lengthening of the period in which plants photosynthesize. To investigate this suggestion, 8 consecutive years of eddy covariance measurements at a northeastern Siberian graminoid tundra site were investigated for patterns in net ecosystem exchange, gross primary production (GPP) and ecosystem respiration (R-eco). While GPP showed no clear increase with longer growing seasons, it was significantly increased in warmer summers. Due to these warmer temperatures however, the increase in uptake was mostly offset by an increase in R-eco. Therefore, overall variability in net carbon uptake was low, and no relationship with growing season length was found. Furthermore, the highest net uptake of carbon occurred with the shortest and the coldest growing season. Low uptake of carbon mostly occurred with longer or warmer growing seasons. We thus conclude that the net carbon uptake of this ecosystem is more likely to decrease rather than to increase under a warmer climate. These results contradict previous research that has showed more net carbon uptake with longer growing seasons. We hypothesize that this difference is due to site-specific differences, such as climate type and soil, and that changes in the carbon cycle with longer growing seasons will not be uniform around the Arctic.},
  author       = {Parmentier, Frans-Jan and van der Molen, M. K. and van Huissteden, J. and Karsanaev, S. A. and Kononov, A. V. and Suzdalov, D. A. and Maximov, T. C. and Dolman, A. J.},
  issn         = {2156-2202},
  language     = {eng},
  pages        = {04013--04013},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research},
  title        = {Longer growing seasons do not increase net carbon uptake in the northeastern Siberian tundra},
  url          = {http://dx.doi.org/10.1029/2011JG001653},
  volume       = {116},
  year         = {2011},
}