Multi-Criteria Evaluation Model for Desertification Hazard Zonation mapping Using GIS (Study Area: Trouti Watershed, Golestan, Iran)

Document Type: Research and Full Length Article

Authors

1 Forestry, Gorgan University of Agriculture Science and Natural Resources

2 Arid Zone Management, Gorgan University of Agriculture Science and Natural Resources

Abstract

Desertification is one of the major issues threatening human communities. Many
methods have been developed for assessment and mapping of desertification hazards. In this
research, multi-criteria evaluation method was used to investigate desertification process in
Trouti watershed, Golestan Province, Iran. At the first step, major desertification factors were
determined by doing field surveys. They were soil texture, aspect, rainfall, sensitivity of
geological formation to erosion, hydrologic soil group, slope and land use. The next step,
information layers were digitized in GIS environment and Digitized maps were converted to
fuzzy standard maps using fuzzy membership functions in IDRISI software. Then, weight of
each factor was determined with the contribution of Analytical Hierarchy Process. Finally, the
susceptible areas to desertification in the study area were identified using Multi-criteria
evaluation method. The results showed that 36.55, 15.21, 40.17 and 8.07 % of the study area
were classified as severe, high, moderate and slow affected by desertification, respectively. It
was concluded that land use and sensitivity of geological formations to erosion were the most
important factors affecting desertification process in Trouti watershed of Golestan Province.

Keywords