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Transforming meadows into free surface water wetlands: Impact of increased nitrate and carbon loading on greenhouse gas production

Stadmark, Johanna LU ; Seifert, Anne-Gret and Leonardson, Lars LU (2009) In Atmospheric Environment 43(6). p.1182-1188
Abstract
In a laboratory study we investigated 1) the potential production of nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) and 2) the effect of nitrate (NO3−) and anaerobic N2O development on CH4 production in sediment from a recently recreated free surface water wetland (FSWW) and in soil from an adjacent meadow. We designed an experiment where production of greenhouse gases was registered at the time of maximum net development of N2O. We made additions of biodegradable carbon (glucose) and/or NO3− to sediment and soil slurries and incubated them at four temperatures (4, 13, 20, 28 °C). Gas production from both substrates was positively correlated with temperature. We also found that the sediment produced more N2O than the soil. N2O... (More)
In a laboratory study we investigated 1) the potential production of nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) and 2) the effect of nitrate (NO3−) and anaerobic N2O development on CH4 production in sediment from a recently recreated free surface water wetland (FSWW) and in soil from an adjacent meadow. We designed an experiment where production of greenhouse gases was registered at the time of maximum net development of N2O. We made additions of biodegradable carbon (glucose) and/or NO3− to sediment and soil slurries and incubated them at four temperatures (4, 13, 20, 28 °C). Gas production from both substrates was positively correlated with temperature. We also found that the sediment produced more N2O than the soil. N2O production in sediment was NO3− limited, whereas in soil carbon availability was lower and only combined additions of NO3− and glucose supported increased N2O development. CH4 production was generally low and did not differ between soil and sediment. Nor did glucose addition increase CH4 rates. The results suggest that neither soil nor sediment environment did support development of methanogenic populations. There were no clear effects of NO3− on CH4 production. However, the highest records of CH4 were found in incubations with low N2O production, which indicates that N2O might be toxic to methanogens. In summary, our study showed that transforming meadows into FSWWs implies a risk of increased N2O emissions. This does not seem to be valid for CH4. However, since N2O is almost always produced wherever NO3− is denitrified, increased N2O production in wetlands leads to reduced rates in downstream environments. Hence, we conclude that when balancing NO3− retention and global warming aspects, we find no reason to discourage future creation or restoration of wetlands. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nitrous oxide, Methane, Wetland, Nitrate, Glucose
in
Atmospheric Environment
volume
43
issue
6
pages
1182 - 1188
publisher
Elsevier
external identifiers
  • scopus:58649118857
ISSN
1352-2310
DOI
10.1016/j.atmosenv.2008.09.036
language
English
LU publication?
yes
id
8c0e55d9-4c86-4869-b445-4377c6dfb485 (old id 1748164)
date added to LUP
2011-01-10 12:48:32
date last changed
2017-01-01 05:54:55
@article{8c0e55d9-4c86-4869-b445-4377c6dfb485,
  abstract     = {In a laboratory study we investigated 1) the potential production of nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) and 2) the effect of nitrate (NO3−) and anaerobic N2O development on CH4 production in sediment from a recently recreated free surface water wetland (FSWW) and in soil from an adjacent meadow. We designed an experiment where production of greenhouse gases was registered at the time of maximum net development of N2O. We made additions of biodegradable carbon (glucose) and/or NO3− to sediment and soil slurries and incubated them at four temperatures (4, 13, 20, 28 °C). Gas production from both substrates was positively correlated with temperature. We also found that the sediment produced more N2O than the soil. N2O production in sediment was NO3− limited, whereas in soil carbon availability was lower and only combined additions of NO3− and glucose supported increased N2O development. CH4 production was generally low and did not differ between soil and sediment. Nor did glucose addition increase CH4 rates. The results suggest that neither soil nor sediment environment did support development of methanogenic populations. There were no clear effects of NO3− on CH4 production. However, the highest records of CH4 were found in incubations with low N2O production, which indicates that N2O might be toxic to methanogens. In summary, our study showed that transforming meadows into FSWWs implies a risk of increased N2O emissions. This does not seem to be valid for CH4. However, since N2O is almost always produced wherever NO3− is denitrified, increased N2O production in wetlands leads to reduced rates in downstream environments. Hence, we conclude that when balancing NO3− retention and global warming aspects, we find no reason to discourage future creation or restoration of wetlands.},
  author       = {Stadmark, Johanna and Seifert, Anne-Gret and Leonardson, Lars},
  issn         = {1352-2310},
  keyword      = {Nitrous oxide,Methane,Wetland,Nitrate,Glucose},
  language     = {eng},
  number       = {6},
  pages        = {1182--1188},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {Transforming meadows into free surface water wetlands: Impact of increased nitrate and carbon loading on greenhouse gas production},
  url          = {http://dx.doi.org/10.1016/j.atmosenv.2008.09.036},
  volume       = {43},
  year         = {2009},
}