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| Titel |
Soil carbon stock increases in the organic layer of boreal middle-aged stands |
| VerfasserIn |
M. Häkkinen, J. Heikkinen, R. Mäkipää |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 5 ; Nr. 8, no. 5 (2011-05-25), S.1279-1289 |
| Datensatznummer |
250005822
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| Publikation (Nr.) |
 copernicus.org/bg-8-1279-2011.pdf |
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| Zusammenfassung |
Changes in the soil carbon stock can potentially have a large influence on
global carbon balance between terrestrial ecosystems and atmosphere. Since
carbon sequestration of forest soils is influenced by human activities,
reporting of the soil carbon pool is a compulsory part of the national
greenhouse gas (GHG) inventories. Various soil carbon models are applied in
GHG inventories, however, the verification of model-based estimates is
lacking. In general, the soil carbon models predict accumulation of soil
carbon in the middle-aged stands, which is in good agreement with
chronosequence studies and flux measurements of eddy sites, but they have not
been widely tested with repeated measurements of permanent plots. The
objective of this study was to evaluate soil carbon changes in the organic
layer of boreal middle-aged forest stands. Soil carbon changes on re-measured
sites were analyzed by using soil survey data that was based on composite
samples as a first measurement and by taking into account spatial variation
on the basis of the second measurement. By utilizing earlier soil surveys, a
long sampling interval, which helps detection of slow changes, could be
readily available.
The range of measured change in the soil organic layer varied from −260 to
1260 g m−2 over the study period of 16–19 years and 23 ± 2 g m−2 per year, on average. The increase was significant in 6 out
of the 38 plots from which data were available. Although the soil carbon
change was difficult to detect at the plot scale, the overall increase
measured across the middle-aged stands agrees with predictions of the
commonly applied soil models. Further verification of the soil models is
needed with larger datasets that cover wider geographical area and represent
all age classes, especially young stands with potentially large soil carbon
source. |
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