 |
| Titel |
Implications of temperature and sediment characteristics on methane formation and oxidation in lake sediments |
| VerfasserIn |
Duc Nguyen, Patrick Crill, David Bastviken |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033331
|
|
|
|
|
|
| Zusammenfassung |
| Methane emissions from aquatic environments depend on methane formation (MF) and
methane oxidation (MO) rates. One important question is to what extent increased
temperatures will affect the balance between MF and MO. We measured potential MF and
MO rates simultaneously at 4oC, 10oC, 20oC and 30oC in sediment from eight different lakes
representing typical boreal and northern temperate lake types. Potential MF rates ranged
between 0.002 and 3.99 μmol CH4 gd.w.-1 day-1, potential MO rates ranged from 0.01 –
0.39 CH4 gd.w.-1 day-1. The potential MF rates were sensitive to temperature and increased
10 to 100 fold over the temperature interval studied. MF also differed between lakes and was
correlated to sediment water content, percent of organic material and C:N ratio.
Potential MO did not depend on temperature or sediment characteristics but was
instead well explained by MF rates at the in situ temperature. It implies that elevated
temperatures will enhance MF rates which may cause increased methane release
from sediments until MO increases as well, as a response to higher methane levels. |
|
|
|
|
|
|