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| Titel |
Long term effects of forest fires to soil C content and soil CO2 efflux
in hemiboreal Scots pine forests of Estonia. |
| VerfasserIn |
Kajar Köster, Marek Metslaid, Argo Orumaa, Kristi Parro, Kalev Jõgiste, Frank Berninger, Jukka Pumpanen, Egle Köster |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126836
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| Publikation (Nr.) |
 EGU/EGU2016-6622.pdf |
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| Zusammenfassung |
| Fire is the primary process which organizes the physical and biological attributes of the
boreal biome and influences energy flows and biogeochemical cycles, particularly the carbon
(C) cycle. Especially the soil organic matter pool in boreal forests is an important C storage
with a long C turnover time, but fire frequencies that are expected to increase with changing
climate, can change that.
We compared the initial recovery of C pools and CO2 efflux following fire disturbances in
Scots pine (Pinus sylvesteris L.) stands with different time since fire. The study areas are
located in hemiboreal vegetation zone, in northwestern Estonia, in Vihterpalu. Six
areas (with extensive fires 200 ha and more) were chosen for study: fire in a year
1837, 1940, 1951, 1982, 1997, and 2008. In all areas we are dealing with stand
replacing fires where all (or almost all) of the stand was destroyed by fire. On every
area we established three permanent sample plots. Soil respiration was measured
manually from all sample plots (measuring interval of two - three weeks). Manual
chamber measurements are performed on 5 collars (north – south orientated and
the distance between collars is 5 m) at each sample plot from May till November
2015. To characterize the soil C and N content and fine root biomass at the sites,
5 soil cores (0.5 m long and 0.05 m in diameter) were taken from each sample
plot.
Our results show that forest fire has a substantial effect on the C content in the top soil
layer, but not in the humus layer and in mineral soil layers. Soil respiration showed similar
chronological response to the time since the forest fire indicating that substantial proportion
of the respiration was originating from the very top of the soil. Soil respiration values were
lowest on the area where the fire was in a year 2008 and the respiration values followed also
seasonal pattern being highest in August and lowest in May and November. The CO2 effluxes
were lowest on newly burned area through the entire growing season. There was positive
correlation between soil temperature and soil respiration values in our study areas. |
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