2.1. Localization
The province of Sidi Bel’Abbes, located in northwestern of Algeria, occupies a privileged and strategic position, with an area of ​​approximately 9.3 km². The locality of Tenira distant of almost 30 km from the south-east of the plain of Mekerra (Figure 1), between the coordinates of Lambert between 0 ° 35’W and 0 ° 25’W of longitude and between 34 ° 5’N and 35 ° 5 ’N of latitude. It covers 16.2 ha. The observation of the digital terrain model (DTM) has shown that the attitude of the forest of Tenira varies between 465 m and 1051 m. From 1985 to 2013, the forests of Sidi Bel’Abbes received an average annual highest of about 490 mm and the lowest is of the order of 201 mm. In the same period; mean monthly temperatures range from 16.1 ° C to 24.7 ° C (Photos 3).