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Increased photosynthesis compensates for shorter growing season in subarctic tundra - 8 years of snow accumulation manipulations

Bosiö, Julia LU ; Stiegler, Christian LU ; Johansson, Margareta LU ; N. Mbufong, Herbert and Christensen, Torben LU (2014) In Climatic Change 127(2). p.321-334
Abstract
This study was initiated to analyze the effect of increased snow cover on plant photosynthesis in subarctic mires underlain by permafrost. Snow fences were used to increase the accumulation of snow on a subarctic permafrost mire in northern Sweden. By measuring reflected photosynthetic active radiation (PAR) the effect of snow thickness and associated delay of the start of the growing season was assessed in terms of absorbed PAR and estimated gross primary production (GPP). Six plots experienced increased snow accumulation and six plots were untreated. Incoming and reflected PAR was logged hourly from August 2010 to October 2013. In 2010 PAR measurements were coupled with flux chamber measurements to assess GPP and light use efficiency of... (More)
This study was initiated to analyze the effect of increased snow cover on plant photosynthesis in subarctic mires underlain by permafrost. Snow fences were used to increase the accumulation of snow on a subarctic permafrost mire in northern Sweden. By measuring reflected photosynthetic active radiation (PAR) the effect of snow thickness and associated delay of the start of the growing season was assessed in terms of absorbed PAR and estimated gross primary production (GPP). Six plots experienced increased snow accumulation and six plots were untreated. Incoming and reflected PAR was logged hourly from August 2010 to October 2013. In 2010 PAR measurements were coupled with flux chamber measurements to assess GPP and light use efficiency of the plots. The increased snow thickness prolonged the duration of the snow cover in spring. The delay of the growing season start in the treated plots was 18 days in 2011, 3 days in 2012 and 22 days in 2013. Results show higher PAR absorption, together with almost 35 % higher light use efficiency, in treated plots compared to untreated plots. Estimations of GPP suggest that the loss in early season photosynthesis, due to the shortening of the growing season in the treatment plots, is well compensated for by the increased absorption of PAR and higher light use efficiency throughout the whole growing seasons. This compensation is likely to be explained by increased soil moisture and nutrients together with a shift in vegetation composition associated with the accelerated permafrost thaw in the treatment plots. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
subarctic, snow, PAR, photosynthesis, light use efficiency, peatland
in
Climatic Change
volume
127
issue
2
pages
321 - 334
publisher
Springer
external identifiers
  • wos:000344387000012
  • scopus:84939969380
ISSN
0165-0009
DOI
10.1007/s10584-014-1247-4
project
MERGE
language
English
LU publication?
yes
id
8c77ea6e-8d4b-41d2-8d40-0e2d51a38b36 (old id 4690231)
date added to LUP
2014-11-14 12:34:40
date last changed
2017-08-13 03:02:35
@article{8c77ea6e-8d4b-41d2-8d40-0e2d51a38b36,
  abstract     = {This study was initiated to analyze the effect of increased snow cover on plant photosynthesis in subarctic mires underlain by permafrost. Snow fences were used to increase the accumulation of snow on a subarctic permafrost mire in northern Sweden. By measuring reflected photosynthetic active radiation (PAR) the effect of snow thickness and associated delay of the start of the growing season was assessed in terms of absorbed PAR and estimated gross primary production (GPP). Six plots experienced increased snow accumulation and six plots were untreated. Incoming and reflected PAR was logged hourly from August 2010 to October 2013. In 2010 PAR measurements were coupled with flux chamber measurements to assess GPP and light use efficiency of the plots. The increased snow thickness prolonged the duration of the snow cover in spring. The delay of the growing season start in the treated plots was 18 days in 2011, 3 days in 2012 and 22 days in 2013. Results show higher PAR absorption, together with almost 35 % higher light use efficiency, in treated plots compared to untreated plots. Estimations of GPP suggest that the loss in early season photosynthesis, due to the shortening of the growing season in the treatment plots, is well compensated for by the increased absorption of PAR and higher light use efficiency throughout the whole growing seasons. This compensation is likely to be explained by increased soil moisture and nutrients together with a shift in vegetation composition associated with the accelerated permafrost thaw in the treatment plots.},
  author       = {Bosiö, Julia and Stiegler, Christian and Johansson, Margareta and N. Mbufong, Herbert and Christensen, Torben},
  issn         = {0165-0009},
  keyword      = {subarctic,snow,PAR,photosynthesis,light use efficiency,peatland},
  language     = {eng},
  number       = {2},
  pages        = {321--334},
  publisher    = {Springer},
  series       = {Climatic Change},
  title        = {Increased photosynthesis compensates for shorter growing season in subarctic tundra - 8 years of snow accumulation manipulations},
  url          = {http://dx.doi.org/10.1007/s10584-014-1247-4},
  volume       = {127},
  year         = {2014},
}