Evaluating the present situation of desertification in Zahak region of Sistan based on water erosion criteria
2011
Hashemi, Z., Dedesertification Ms.c Zabol University | Pahlevanravi, A., Faculty member of Natural Resources of Zabol University | Moghaddamnia, A. R., Faculty Member of Natural Resources of Zabol University | Javadi, M. R., Faculty Member of Islamic Azad university Noor | Miri, A., Faculty Member of Natural Resources of Zabol University
Many studies have been carried out to assess and prepare desertification map in the world. In order to develop a regional model and quantitatively assess the present situation of desertification, a study was carried out in an area of 88350 hectares in Zahak region of Sistan. In this study, at first by combining information extracted from topographic and geologic maps, air photos and field survey, the area was divided into 11 geomorphologic facies; each of which was considered as the main unit for evaluation of the present situation of desertification. Considering to FAO-UNEP and MICD models are the most famous models of desertification intensity assessment in Iran and world. In this study, based on land use, effective indices emphasizing water erosion criterion were identified using to FAO-UNEP and MICD models. Then, the most effective of indexes was selected and a desertification area model was allocated. Also, the numerical value of indices was analyzed in each work unit and after all area. Finally, the present situation of desertification intensity of the study area emphasize of water erosion criterion in four classes of insignificant and low, medium, intense and very intense was estimated. The results indicate that in the developed regional model, the study area with respect to intensity of desertification is placed in about 4915 hectare (5.9 %) in the low class and about 78599 hectare (94.1 %) in the medium class. also the weight medium of quantities valuation estimated in the total area DS=15.19.That, it indicated the intensity of desertification medium class in the total area.
显示更多 [+] 显示较少 [-]