1. Runoff control and Vitellaria paradoxa parkland regeneration in Siguidolo. K. Traoré

2. Southern Mali Area. 600 mm 700 900 1000 1100 mm 800 Guinée Burkina Faso Côte d’Ivoire Niger River Mean Annual rainfall (1961 - 1990) Ségou San Koutiala Sikasso Bougouni Fana Bamako Tombouctou 12° 0° 16° 20° 24° 4° 8° 

3. Sand stone Weathered bedrock ironstone outcrops (slope 1-4%) chromic luvisol (variable slope) PlateauCropped piedmont slope Upper part (slope 1%) Lower part gleyic luvisol colluvium Bush land and grazing area Extensive cropsIntensive crops

4. Vitellaria paradoxa parkland and agriculture Soils are acids

5. Vitellaria paradoxa parkland and agriculture Low input agricultural system ( 64 kg ha-1 of NPKS) Tree parkland a source of organic matter But…. a problem of water availability for trees (mainly during the dry season) Low manure production Runoff

6. objectives trees distribution, growth and production trees parkland and water dynamic According to the position on the toposequence analyse:

7. MATERIALS AND METHODS

8. Runoff measurement

9. Measurement of soil water content Collection of soil samples using a helicoid auger, down to a depth of 200 cm Three replications for each depth Samples are oven dried at 105 °C during 72 h

10. Measurement of trees regeneration Aerial photograph before starting contour cultivation GIS for tree mapping

11. RESULTS

12. Typical Runoff Contour cultivation withwithout Upper slope17%27% Middle slope16%26% Lower slope14%23% Year: 2002 Annual rainfall: 619 mm

13. Effects of contour ridges on soil humidity Without contour ridge With contour ridge JulyAugust overflow

14. Shea nuts production under water conservation

15. Leaf litter production Leaf litter kg tree-1 year-1

16. 1956 1978 1991 2002

17. Trees regeneration by contour ridges

18. Growth of regenerated Faidherbia albida with water conservation

19. Growth of regenerated Faidherbia albida

20. Conclusion Contour ridges Improve rainwater conservation `Allow trees regeneration Improve trees production