Réhabilitation des écosystèmes sahariens : evaluation des travaux de régénération de Acacia raddiana dans la zone Sud du Maroc

الملخص EN

The Regional Directorate of Water and Forest and Combatting Desertification (DREFLCD-Sud, Laayoune) have, since a few years, achieved enormous efforts regarding the restoration of the Saharan natural stands of Acacia raddiana.

From 2005 to 2012, 3710 ha were planted with this species in different regions: Tata, Es-Smara, Tan Tan, Assa Zag, Dakhla, Boujdour, Laayoune and Guelmim.

The assessment of the success rate of Acacia raddiana plantations was conducted based on the study of the influencing facteurs such as the age of the seedling, the rainfall, the surface treated, the frequency of main maintenance operations, the density and the remaining living seedlings.

This assessement was necessary to orientate future plantation programmes.

The statistical analysis of collected data has shown that success rate increases if the plantation plots receive at least two maintenance operations during the first two years (more than 58 %).

However, the density has no effect on the rate of success but it increases the number of survival seedlings per hectare.

The success rate after the 2nd maintenance operation exceeds 58%; the residual success rates are varying between 40 and 60 %.

Perimeters that received two successive maintenance operations have a higher success rate than those with just one.