Photosynthesis, stomatal conductance and terpene emission response to water availability in dry and mesic Mediterranean forests
| Autor: | Shani Roahtyn, Eyal Rotenberg, Joan Llusià, Alex Guenther, Roger Seco, Josep Peñuelas, Dan Yakir |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Mediterranean climate Stomatal conductance Quercus ithaburensis 010504 meteorology & atmospheric sciences Physiology Drought tolerance ved/biology.organism_classification_rank.species Plant Science Gas interchange Photosynthesis 01 natural sciences Terpene emission rates Botany Mediterranean drought conditions 0105 earth and related environmental sciences Ecology Quercus calliprinos biology ved/biology Forestry 15. Life on land biology.organism_classification Arid Agronomy 13. Climate action Environmental science Pinus halepensis 010606 plant biology & botany Woody plant |
| Zdroj: | Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Popis: | Warmer summer conditions result in increased terpene emissions except under severe drought, in which case they strongly decrease. Water stress results in a reduction of the metabolism of plants and in a reorganization of their use of resources geared to survival. In the Mediterranean region, periods of drought accompanied by high temperatures and high irradiance occur in summer. Plants have developed various mechanisms to survive in these conditions by resisting, tolerating or preventing stress. We used three typical Mediterranean tree species in Israel, Pinus halepensis L., Quercus calliprinos and Quercus ithaburensis Webb, as models for studying some of these adaptive mechanisms. We measured their photosynthetic rates (A), stomatal conductance (g s), and terpene emission rates during spring and summer in a geophysical gradient from extremely dry to mesic from Yatir (south, arid) to Birya (north, moist) with intermediate conditions in Solelim. A and g s of P. halepensis were threefold higher in Birya than in Yatir where they remained very low both seasons. Quercus species presented 2–3-fold higher A and g s but with much more variability between seasons, especially for Q. ithaburensis with A and g s that decreased 10–30-fold from spring to summer. Terpene emission rates for pine were not different regionally in spring but they were 5–8-fold higher in Birya than in Yatir in summer (P |
| Databáze: | OpenAIRE |
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