4.3. Analysis of changes in forest of Tenira from 1987 to 2018
The changes between 1987 and 2018 showed a considerable reduction in reforestation areas at (-93.0%) and bare soil at (-48.8%) against an extension of those of the olive areas at (36.8%) and annual crops at (18.0%). The regeneration of formation of aleppo pine was low, it marks only an increase of (+ 11.6%) to (16%) of its areas of distributions. In the state in 2018; we observed the regression of the maquis of aleppo pine (- 19%), reforestation to (+76.0%), bare soil in (+70.4%), and annual crops up to (+34.1%). In this situation the most abundant soil types are Rendzic Leptosols, Calcaric Cambisols in the northern part of the study area. We also notice the dominance of the soil Calcisols, Calcaric Fluvisols and Humic,Cambisols (Rubic-Brunic). The Calcaric Cambisols type soil cover is clearly regressing (Photos 3).