 |
| Titel |
Responses of gas exchange and plant hydraulic conductance to water deficit in silver birch trees growing under increasing atmospheric humidity |
| VerfasserIn |
Arne Sellin, Priit Kupper |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074358
|
|
|
|
|
|
| Zusammenfassung |
| Climate change scenarios predict increase in air temperature by 3.5–5Ë C and precipitation
by 5–30% in boreal and northern temperate regions of Europe by the end of the century. On
the other hand, climate extremes including heat waves and droughts are projected to
become more frequent and last longer across Europe over the 21st century. Increasing
atmospheric humidity inevitably occurring with more frequent rainfall events reduce water
fluxes through the vegetation, and have an effect on the structure of leaves and
vascular tissues, plant hydraulic properties, biomass allocation, nutrient uptake and
growth (Tullus et al. 2012). We investigated fast and long-term effects of water
deficit on plant water status, gas exchange and hydraulic conductance on saplings of
silver birch (Betula pendula) growing under artificially manipulated air humidity
in an experimental forest ecosystem at the Free Air Humidity Manipulation site
(http://www.lote.ut.ee/FAHM/in-english; Kupper et al. 2011). Fast-developing water deficit
was imposed by letting cut sample branches to dehydrate in open-air conditions, long-term
water deficit was generated by seasonal drought. The fast-imposed water deficit estimated by
leaf (ΨL) or branch water status (ΨB) had highly significant (P |
|
|
|
|
|
|