This document summarizes research on soil erosion and land degradation in Ethiopia and approaches to model the impacts of interventions. It discusses measuring soil loss, nutrient loss, and the impacts of sustainable land management practices. Models like USLE and SWAT are proposed to extrapolate this data to other areas using GIS and by characterizing recommendation domains based on biophysical and socioeconomic parameters. The document outlines procedures for validating and applying these models to quantify on-site and off-site impacts of land degradation and the benefits of interventions.

1. From Soil Erosion Research to Modeling Impacts of Interventions: The Case of Ethiopia By Gete Zeleke GMP UN expert group meeting on “ Sustainable land management and agricultural practices in Africa: Bridging the gap between research and farmers” April 16 – 17, 2009, University of Gothenburg, Sweden.

5. Gete, 2005 Common in the rainy season

8. Land Cover in Dembecha Area, Ethiopia, in 1957 and 1995 Gete Zeleke 2000

11. 1. Poor Land Management

13. 3. Energy sources for HH domestic use Amare, 2008

18. (4) Water tables and water supply (5) Biomass for livestock and bee keeping

21. February 2004 October 2005 19 May 2003 October 2005

27. Afdeyu

36. Examples of National coverage for key parameters

37. farming system Farming system: Ethiopia

38. extrapolation of station data based on similarity of environmental conditions

39. farming system Farming system: teff, wheat, maize & pulses Farming system – Similar to Anjeni

40. soils Soils – Similar to Anjeni

41. altitude Altitudinal belts – Similar to Anjeni

42. rainfall Annual rainfall – Similar to Anjeni

43. LGP – Similar to Anjeni

44. slope Slope – Similar to Anjeni

45. temperature Annual Meant Temp – Similar to Anjeni

46. GIS Modelling and Overlays: Areas that can be represented by Anjeni

47. Areas that can be represented by Anjeni- by woreda (range)

48. Areas that can be represented by Anjeni- by woreda ( best fit areas only )

49. Part V: Extrapolation A: Model application (Eg. USLE) to extrapolate on-site processes and impacts

57. Phase II: Procedures of extrapolation to Recommendation Domains (Eg) Soil Loss (Map and Data) K- Map LS - Map C/P - Map R – Map Soil Map DEM Land Use Map Climate Overlay

58. B: Model application (Eg. SWAT) to extrapolate off-site processes and impacts

62. HRUs Basin/Big watershed ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( drainage outlets drainage lines microbasins Sub- basin/sub-watershed