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Adaptation of the future tree species mix of the Vienna Woods to possible consequences of climate change due to historical drought stress responses, determined on the basis of site, soil and tree ring analyses - subproject tree ring analysis

Subproject of: Adapting future tree species composition of the Vienna Woods to possible consequences of climate change based on past drought responses, as indicated by forest site -, soil - and tree ring parameters (WiwaKonKlim)

Project Leader
Grabner Michael, BOKU Project Leader
Duration:
01.05.2022-30.09.2024
Programme:
Waldfonds - DAFNE 90 - Ma├čnahme 8
Type of Research
Basic Research
Staff
BOKU Research Units
Institute of Wood Technology and Renewable Materials
Funded by
Federal Ministry of Agriculture, Regions and Tourism, Stubenring 1, 1010 Wien, Austria
Abstract
Knowledge about the specific drought stress responses of our native tree species is necessary to estimate future climate-induced shifts in their distribution zones. Beech is the main tree species of the Vienna Woods, but it is particularly sensitive to soil drought and high air temperatures. Other tree species such as oak, hornbeam, larch, red and black pine, fir, spruce, Douglas fir, robinia and Norway maple are currently only admixed to a small extent. In this project, dendrochronological and dendrochemical analyses as well as ecohydrological models will be blended with a worldwide unique data set (up to 97 beech stands) of soil and leaf data from 1984 and 2012.

Furthermore, stable isotope analyses of carbon (13C/12C ratios) in dated tree rings are analysed to characterise drought stress periods. Closed closure cells (stomata) cause photosynthetic discrimination of 13CO2, so that leaves and dated growth rings are characterised by lower 13C/12C ratios.

The research questions are: i) How drought sensitive is beech compared to the other occurring tree species oak, hornbeam, larch, Scots pine, black pine, fir, spruce, Douglas fir, robinia and Norway maple? ii) Which dendrochemical parameters are best suited to estimate the (historical) transpiration rates of the tree species under investigation? iii) How do site factors (climate, soil, location) influence the order of tree species-specific sensitivity? iv) Do the experimentally collected data agree with the modelled stand values for resistance, recovery and resilience with respect to soil drought, and if so, can climate-induced changes be predicted?

Ultimately, the aim is to derive future stocking targets of the Vienna Woods for different climate scenarios based on historical drought stress responses of the listed tree species.

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Keywords
Forest ecology;
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