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| Titel |
Carbon and oxygen isotope signatures in conifers from the Swiss National Park |
| VerfasserIn |
Olga Churakova Sidorova, Matthias Saurer, Rolf Siegwolf, Marina Bryukhanova, Christof Bigler |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105850
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| Publikation (Nr.) |
 EGU/EGU2015-5438.pdf |
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| Zusammenfassung |
| Our study investigates the physiological response and plasticity of trees under climatic
changes for larch (Larix decidua) and mountain pine (Pinus mugo var. uncinata) in the Swiss
National Park.This research was done in the context of investigation tree mortality and their
potential to survive under the harsh mountainous conditions.
For the stable isotope analysis we selected four mountain pine and four larch trees from
each a south- and north-facing slope. Oxygen isotope ratios can give insight into water
sources and evaporative processes. To understand the differential response of mountain pine
and larch to short-term climatic changes we measured 18O/16O in water extracted from twigs
and needles as well as soil samples for each species at both sites. The seasonal variabilities in
18O/16O needles and twigs of mountain pine and larch trees as well as soil samples
were related to changes in climate conditions from end of May until middle of
October.
To reveal the main climatic factors driving tree growth of pine and larch trees in the
long-term, tree-ring width chronologies were built and bulk 18O/16O, 13C/12C wood
chronologies were analyzed and correlated with climatic parameters over the last 100 years.
The results indicate a strong influence of spring and summer temperatures for larch trees,
while variation of spring and summer precipitations is more relevant for mountain pine
trees.
This work is supported by the Swiss National Science Foundation, Marie-Heim Vögtlin
Program PMPDP-2 145507 |
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