Hydric behavior of four Atlas cedar (Cedrus atlantica M.) seedlings in the face of a water deficit on two types of substrate
Jalila Aoujdad, Mohamed Ouajdi, Younes Abbas, Salwa El Antry, Abdenbi Zine EL Abidine, Mohamed Fadli
The current state of the Moroccan cedars is worrying and it would be no less in the future years, especially in view of climate change which, most likely, would be manifested by an increase in temperatures and a reduction in precipitation. Decaying cedar trees, the scarcity of natural regeneration, the difficulty of artificial regeneration and the reduction of its range are all manifestations of the dysfunction of this ecosystem. To better understand the ecophysiological mechanisms related to water stress in Atlas cedar (Cedrus atlantica M.), an experimental device was installed in nurseries on plants from four provenance regions: Tizi Ifri (Rif), Sidi M 'guild (Middle Western Atlas), Tamtroucht (Middle Eastern Atlas) and Bouadel (Eastern High Atlas). These plants, transplanted at 9 months on calcareous and basaltic substrates were subjected to water stress by watering shutdown at the age of 17 months. The parameters of plant water relationships that are significantly related to changes in soil conditions and water availability were estimated during this period. The results show that at the end of the drying test, on basaltic substrate, the provenance of Sidi M'guild stood out significantly from the other sources by a pre-blooming water potential Ψb (-27.81 bars) and a potential water of midday Ψm (-29.75 bars) less negative, a daily amplitude of the water potential of the order (1,93 bars). On calcareous soil, the Bouadel and Tamtroucht provenances recorded close and less negative values ??for all the parameters measured. The provenance of Tizi Ifri is the least tolerant to water stress with the most negative values ??for Ψb and Ψm and a lower daily amplitude. These results show the highest performance of Sidi M'guild provenances on basaltic substrate and Bouadel and Tamtroucht on limestone substrate as regards their resistance to water stress. This work helps guide managers towards choosing the most suitable provenances for environmental conditions.
Jalila Aoujdad, Mohamed Ouajdi, Younes Abbas, Salwa El Antry, Abdenbi Zine EL Abidine, Mohamed Fadli. Hydric behavior of four Atlas cedar (Cedrus atlantica M.) seedlings in the face of a water deficit on two types of substrate. International Journal of Multidisciplinary Research and Development, Volume 5, Issue 12, 2018, Pages 28-36