| 37422 |
Creator |
9afccdbe975e25965953e777bb4d6a5f |
| 37422 |
Creator |
a83b960ddf2843a8567430721dcd0f08 |
| 37422 |
Creator |
ee79fd287561bc136db89c4e76108e88 |
| 37422 |
Creator |
ext-3bd7da6b62a40dc714294c587ee9a895 |
| 37422 |
Creator |
ext-64f57d5140f7cb2c8cc379054deee73e |
| 37422 |
Date |
2013-04-10 |
| 37422 |
Is Part Of |
repository |
| 37422 |
Is Part Of |
p21698961 |
| 37422 |
abstract |
Variations to the global wetland CH<sub>4</sub> source strength in response to changes
in orbital insolation patterns and atmospheric CO<sub>2</sub> concentration ([CO<sub>2</sub>]<sub>a</sub>)
are hypothesized to play an important role in determining glacial-interglacial variations
in atmospheric CH<sub>4</sub> concentration ([CH<sub>4</sub>]<sub>a</sub>). Here the
interactive effects of temperature, a major controlling variable determining wetland
CH<sub>4</sub> flux, and the low [CO<sub>2</sub>]<sub>a</sub> of glacial intervals
are investigated for the first time. We measured the temperature dependence of CH<sub>4</sub>
emissions from replicated mesocosms (<i>n</i> = 8 per CO<sub>2</sub> treatment) collected
from a minerotrophic fen and an ombrotrophic bog incubated in either ambient (c. 400
ppm) or glacial (c. 200 ppm) [CO<sub>2</sub>]<sub>a</sub> located in the United Kingdom.
CH<sub>4</sub> fluxes were measured at 5°C, 10°C, 15°C, 20°C, and 25°C and then in
reverse order over a 20 day period under each [CO<sub>2</sub>]<sub>a</sub> treatment.
Results showed that the <i>Q</i><sub>10</sub> temperature response of CH<sub>4</sub>
emissions from the <i>Carex/Juncus</i>-dominated fen declined significantly by approximately
39% under glacial [CO<sub>2</sub>]<sub>a</sub> (ambient [CO<sub>2</sub>]<sub>a</sub>
= 2.60, glacial [CO<sub>2</sub>]<sub>a</sub> = 1.60; <i>P</i> < 0.01). By contrast,
the response of CH<sub>4</sub> emissions from the <i>Sphagnum</i>-dominated bog remained
unaltered (ambient [CO<sub>2</sub>]<sub>a</sub> = 3.67, glacial [CO<sub>2</sub>]<sub>a</sub>
= 3.67; <i>P</i> > 0.05). This contrasting response may be linked to differences in
plant species assemblage and the varying impact of CO<sub>2</sub> starvation on plant
productivity and carbon availability in the rhizosphere. Furthermore, our results
provide empirical evidence to support recent model-based indications that glacial-interglacial
variations in [CH<sub>4</sub>]<sub>a</sub> may be explained by changes in wetland
CH<sub>4</sub> source strength in response to orbitally forced changes in climate
and [CO<sub>2</sub>]<sub>a</sub>. |
| 37422 |
authorList |
authors |
| 37422 |
issue |
2 |
| 37422 |
status |
peerReviewed |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/147605 |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/147606 |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/147607 |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/147608 |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/147609 |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/147610 |
| 37422 |
uri |
http://data.open.ac.uk/oro/document/148017 |
| 37422 |
volume |
118 |
| 37422 |
type |
AcademicArticle |
| 37422 |
type |
Article |
| 37422 |
label |
Boardman, Carl P. ; Gauci, Vincent ; Fox, Andrew; Blake, Stephen and Beerling,
David J. (2013). Reduction of the temperature sensitivity of minerotrophic fen methane
emissions by simulated glacial atmospheric carbon dioxide starvation. Journal of
Geophysical Research: Biogeosciences, 118(2) pp. 462–470. |
| 37422 |
label |
Boardman, Carl P. ; Gauci, Vincent ; Fox, Andrew; Blake, Stephen and Beerling, David
J. (2013). Reduction of the temperature sensitivity of minerotrophic fen methane
emissions by simulated glacial atmospheric carbon dioxide starvation. Journal of
Geophysical Research: Biogeosciences, 118(2) pp. 462–470. |
| 37422 |
Title |
Reduction of the temperature sensitivity of minerotrophic fen methane emissions by
simulated glacial atmospheric carbon dioxide starvation |
| 37422 |
in dataset |
oro |