Presented by Didier Zida, ILRI, Nairobi, 16 August 2011

1. Spatial modeling the impact of livestock grazing, Fire management and wood cutting on the structure of savana woodland vegetation Dr Didier Zida Post-doc 16 August 2011

3. Fuel wood and non-wood forest products from African savanna woodlands are essential for livelihood of the rural people.  The challenge is to manage these disturbances to sustain livelihood and environment In Burkina Faso, Livestock grazing , wood cutting , and fire are common anthropogenic disturbances shaping savanna woodland vegetation structure and functions

4. Study sites

5. Experimental design in Laba et Tiogo since 1992 Mean annual rainfall Laba (1992-2008): 886 mm Mean annual rainfall Tiogo (1992-2008): 845 mm

6. Silviculture Treatements applied to each experimental site Grazing Fire Selective cutting Number of plots of 2500 m 2 Grazing No Grazing No Fire Annual early fire 3 year fire exclusion No fire Annual early fire 3 year fire exclusion No Cutting Selective cutting Cutting + Direct seeding No Cutting Selective cutting Cutting + Direct seeding No Cutting Selective cutting Cutting + Direct seeding No Cutting Selective cutting Cutting + Direct seeding No Cutting Selective cutting Cutting + Direct seeding No Cutting Selective cutting Cutting + Direct seeding 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

10. Need of Extrapolation of the existing insight in factors influencing carbon stores beyond the few ha of the experimental plots. Aim of the post-doc: - Develop a rule based model and - Proto-type a GIS based system allowing simulating the effects of grazing, fuel-wood collection and fire management on the vegetation physiognomy of the two state forests This extrapolation require spatially explicit models which allow to predict the state of the vegetation from its history of grazing by livestock, the intensity and frequency of fire and fuelwood collection .  6 month post-doc:

11. THANK YOU FOR YOUR ATTENTION!