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| Titel |
Carbon pools and temporal dynamics along a rotation period in sessile oak dominated high forest and coppice with standards stands |
| VerfasserIn |
V. J. Bruckman, S. Yan, E. Hochbichler, G. Glatzel |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063337
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| Zusammenfassung |
| Carbon pools in two Quercus petraea (sessile oak) dominated chronosequences under
different forest management (high forest and coppice with standards) were investigated. The
objective was to study temporal carbon dynamics, in particular carbon sequestration in the
soil and woody biomass production, in common forest management systems in eastern
Austria along with stand development. The chronosequence approach was used to substitute
time-for-space to enable coverage of a full rotation period in each system. Carbon
content was determined in the following compartments: aboveground biomass,
litter, soil to a depth of 50 cm, living root biomass and decomposing residues in
the mineral soil horizons. Biomass carbon pools, except fine roots and residues,
were estimated using species-specific allometric functions. Total carbon pools were
on average 143 Mg ha-1 in the high forest stand (HF) and 213 Mg ha-1 in the
coppice with standards stand (CS). The mean share of the total organic carbon pool
(TOC) which is soil organic carbon (SOC) differs only marginally between HF
(43.4%) and CS (42.1%), indicating the dominance of site factors, particularly
climate, in controlling this ratio. While there was no significant change in O-layer and
SOC stores over stand development, we found clear relationships between living
biomass (aboveground and belowground) pools and C:N ratio in topsoil horizons
with stand age. SOC pools seem to be very stable and an impact of silvicultural
interventions was not detected with the applied method. Rapid decomposition and
mineralization of litter, indicated by low O-horizon pools with wide C:N ratios of
residual woody debris at the end of the vegetation period, suggests high rates of
turnover in this fraction. CS, in contrast to HF benefits from rapid resprouting after
coppicing and hence seems less vulnerable to conditions of low rainfall and drying
topsoil.
Keywords: carbon dynamics; soil carbon; chronosequence; Quercus petraea; coppice;
high forest |
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