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Variability in exchange of CO2 across 12 northern peatland and tundra sites

Lund, Magnus LU ; Lafleur, Peter M.; Roulet, Nigel T.; Lindroth, Anders LU ; Christensen, Torben LU ; Aurela, Mika; Chojnicki, Bogdan H.; Flanagan, Lawrence B.; Humphreys, Elyn R. and Laurila, Tuomas, et al. (2010) In Global Change Biology 16(9). p.2436-2448
Abstract
Many wetland ecosystems such as peatlands and wet tundra hold large amounts of organic carbon (C) in their soils, and are thus important in the terrestrial C cycle. We have synthesized data on the carbon dioxide (CO2) exchange obtained from eddy covariance measurements from 12 wetland sites, covering 1-7 years at each site, across Europe and North America, ranging from ombrotrophic and minerotrophic peatlands to wet tundra ecosystems, spanning temperate to arctic climate zones. The average summertime net ecosystem exchange of CO2 (NEE) was highly variable between sites. However, all sites with complete annual datasets, seven in total, acted as annual net sinks for atmospheric CO2. To evaluate the influence of gross primary production (GPP)... (More)
Many wetland ecosystems such as peatlands and wet tundra hold large amounts of organic carbon (C) in their soils, and are thus important in the terrestrial C cycle. We have synthesized data on the carbon dioxide (CO2) exchange obtained from eddy covariance measurements from 12 wetland sites, covering 1-7 years at each site, across Europe and North America, ranging from ombrotrophic and minerotrophic peatlands to wet tundra ecosystems, spanning temperate to arctic climate zones. The average summertime net ecosystem exchange of CO2 (NEE) was highly variable between sites. However, all sites with complete annual datasets, seven in total, acted as annual net sinks for atmospheric CO2. To evaluate the influence of gross primary production (GPP) and ecosystem respiration (R-eco) on NEE, we first removed the artificial correlation emanating from the method of partitioning NEE into GPP and R-eco. After this correction neither R-eco (P = 0.162) nor GPP (P = 0.110) correlated significantly with NEE on an annual basis. Spatial variation in annual and summertime R-eco was associated with growing season period, air temperature, growing degree days, normalized difference vegetation index and vapour pressure deficit. GPP showed weaker correlations with environmental variables as compared with R-eco, the exception being leaf area index (LAI), which correlated with both GPP and NEE, but not with R-eco. Length of growing season period was found to be the most important variable describing the spatial variation in summertime GPP and R-eco; global warming will thus cause these components to increase. Annual GPP and NEE correlated significantly with LAI and pH, thus, in order to predict wetland C exchange, differences in ecosystem structure such as leaf area and biomass as well as nutritional status must be taken into account. (Less)
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published
subject
keywords
tundra, wetland, respiration, photosynthesis, peatland, net ecosystem exchange, mire, eddy covariance, carbon, carbon dioxide
in
Global Change Biology
volume
16
issue
9
pages
2436 - 2448
publisher
Wiley-Blackwell
external identifiers
  • wos:000280633700004
  • scopus:77955233072
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2009.02104.x
project
MERGE
BECC
language
English
LU publication?
yes
id
5bdbf699-7e07-4aea-a5c2-8b579b8e83bc (old id 1678283)
date added to LUP
2010-09-21 09:58:02
date last changed
2018-07-15 03:04:59
@article{5bdbf699-7e07-4aea-a5c2-8b579b8e83bc,
  abstract     = {Many wetland ecosystems such as peatlands and wet tundra hold large amounts of organic carbon (C) in their soils, and are thus important in the terrestrial C cycle. We have synthesized data on the carbon dioxide (CO2) exchange obtained from eddy covariance measurements from 12 wetland sites, covering 1-7 years at each site, across Europe and North America, ranging from ombrotrophic and minerotrophic peatlands to wet tundra ecosystems, spanning temperate to arctic climate zones. The average summertime net ecosystem exchange of CO2 (NEE) was highly variable between sites. However, all sites with complete annual datasets, seven in total, acted as annual net sinks for atmospheric CO2. To evaluate the influence of gross primary production (GPP) and ecosystem respiration (R-eco) on NEE, we first removed the artificial correlation emanating from the method of partitioning NEE into GPP and R-eco. After this correction neither R-eco (P = 0.162) nor GPP (P = 0.110) correlated significantly with NEE on an annual basis. Spatial variation in annual and summertime R-eco was associated with growing season period, air temperature, growing degree days, normalized difference vegetation index and vapour pressure deficit. GPP showed weaker correlations with environmental variables as compared with R-eco, the exception being leaf area index (LAI), which correlated with both GPP and NEE, but not with R-eco. Length of growing season period was found to be the most important variable describing the spatial variation in summertime GPP and R-eco; global warming will thus cause these components to increase. Annual GPP and NEE correlated significantly with LAI and pH, thus, in order to predict wetland C exchange, differences in ecosystem structure such as leaf area and biomass as well as nutritional status must be taken into account.},
  author       = {Lund, Magnus and Lafleur, Peter M. and Roulet, Nigel T. and Lindroth, Anders and Christensen, Torben and Aurela, Mika and Chojnicki, Bogdan H. and Flanagan, Lawrence B. and Humphreys, Elyn R. and Laurila, Tuomas and Oechel, Walter C. and Olejnik, Janusz and Rinne, Janne and Schubert, Per and Nilsson, Mats B.},
  issn         = {1354-1013},
  keyword      = {tundra,wetland,respiration,photosynthesis,peatland,net ecosystem exchange,mire,eddy covariance,carbon,carbon dioxide},
  language     = {eng},
  number       = {9},
  pages        = {2436--2448},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Variability in exchange of CO2 across 12 northern peatland and tundra sites},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2009.02104.x},
  volume       = {16},
  year         = {2010},
}