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Rapid turnover of DOC in temperate forests accounts for increased CO2 production at elevated temperatures

Bengtson, Per LU and Bengtsson, Göran LU (2007) In Ecology Letters 10(9). p.783-790
Abstract
The evidence for the contribution of soil warming to changes in atmospheric CO2 concentrations and carbon stocks of temperate forest ecosystems is equivocal. Here, we use data from a beech/oak forest on concentrations and stable isotope ratios of dissolved organic carbon (DOC), phosphate buffer-extractable organic carbon, soil organic carbon (SOC), respiration and microbial gross assimilation of N to show that respired soil carbon originated from DOC. However, the respiration was not dependent on the DOC concentration but exceeded the daily DOC pool three to four times, suggesting that DOC was turned over several times per day. A mass flow model helped to calculate that a maximum of 40% of the daily DOC production was derived from SOC and... (More)
The evidence for the contribution of soil warming to changes in atmospheric CO2 concentrations and carbon stocks of temperate forest ecosystems is equivocal. Here, we use data from a beech/oak forest on concentrations and stable isotope ratios of dissolved organic carbon (DOC), phosphate buffer-extractable organic carbon, soil organic carbon (SOC), respiration and microbial gross assimilation of N to show that respired soil carbon originated from DOC. However, the respiration was not dependent on the DOC concentration but exceeded the daily DOC pool three to four times, suggesting that DOC was turned over several times per day. A mass flow model helped to calculate that a maximum of 40% of the daily DOC production was derived from SOC and to demonstrate that degradation of SOC is limiting respiration of DOC. The carbon flow model on SOC, DOC, microbial C mobilization/immobilization and respiration is linked by temperature-dependent microbial and enzyme activity to global warming effects Of CO2 emitted to the atmosphere. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
soil organic carbon, respiration, biomass, microbial, carbon dioxide enrichment, dissolved organic carbon turnover, soil warming, stable isotopes
in
Ecology Letters
volume
10
issue
9
pages
783 - 790
publisher
Wiley-Blackwell
external identifiers
  • wos:000248598300004
  • scopus:34547464152
ISSN
1461-023X
DOI
10.1111/j.1461-0248.2007.01072.x
language
English
LU publication?
yes
id
5fbba236-468e-46fb-b15b-5ab7ddf00abb (old id 656168)
date added to LUP
2007-12-05 11:58:33
date last changed
2017-09-10 03:51:25
@article{5fbba236-468e-46fb-b15b-5ab7ddf00abb,
  abstract     = {The evidence for the contribution of soil warming to changes in atmospheric CO2 concentrations and carbon stocks of temperate forest ecosystems is equivocal. Here, we use data from a beech/oak forest on concentrations and stable isotope ratios of dissolved organic carbon (DOC), phosphate buffer-extractable organic carbon, soil organic carbon (SOC), respiration and microbial gross assimilation of N to show that respired soil carbon originated from DOC. However, the respiration was not dependent on the DOC concentration but exceeded the daily DOC pool three to four times, suggesting that DOC was turned over several times per day. A mass flow model helped to calculate that a maximum of 40% of the daily DOC production was derived from SOC and to demonstrate that degradation of SOC is limiting respiration of DOC. The carbon flow model on SOC, DOC, microbial C mobilization/immobilization and respiration is linked by temperature-dependent microbial and enzyme activity to global warming effects Of CO2 emitted to the atmosphere.},
  author       = {Bengtson, Per and Bengtsson, Göran},
  issn         = {1461-023X},
  keyword      = {soil organic carbon,respiration,biomass,microbial,carbon dioxide enrichment,dissolved organic carbon turnover,soil warming,stable isotopes},
  language     = {eng},
  number       = {9},
  pages        = {783--790},
  publisher    = {Wiley-Blackwell},
  series       = {Ecology Letters},
  title        = {Rapid turnover of DOC in temperate forests accounts for increased CO2 production at elevated temperatures},
  url          = {http://dx.doi.org/10.1111/j.1461-0248.2007.01072.x},
  volume       = {10},
  year         = {2007},
}