Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Universidad Austral de Chile
2007
|
| Soggetti: | |
| Accesso online: | https://www.redalyc.org/articulo.oa?id=173113292006 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
Sommario:
- Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings Javier Enrique Gyenge María Elena Fernández Tomás Schlichter Agrociencias transpiration Photosynthesis stomatal conductance instantaneous water use efficiency Austrocedrus chilensis is a conifer from Patagonia adapted to a wide moisture gradient. In xeric environments, its natural or artificial recruitment only occurs under nurse shrubs during normal rainfall years. In spite of its importance in ecological and economical terms, little information is available about the physiology of this species. Previous field measurements in experimental plantation revealed that seedlings without plant cover had lower survival, photo synthetic rates and predawn water potential than those planted under trees. So, the response of stomata to radiation and vapor pressure deficit, and the effect of drought stress on photosynthesis and transpiration of A. chilensis seedlings were studied under controlled conditions. Even when soil water was not limiting, all seedlings showed an early stomatal closure in response to moderate evaporative demand. Photo synthetic parameters and instantaneous water use efficiency suggested that microenvironments with intermediate shade are the best for A. chilensis C0(2) uptake. We suggest that the early stomatal closure could result in damage in leaves or the base of the stem by oveheating, explaining low survival when grown without shade. As a whole, our results may contribute to understanding the need for nurse plants in the establishment of the species 2007 artículo científico 0304-8799 https://www.redalyc.org/articulo.oa?id=173113292006 en http://www.redalyc.org/revista.oa?id=1731 Bosque application/pdf Universidad Austral de Chile Bosque (Chile) Num.3 Vol.28