Efficiency comparison of ESAs and IMDPA models in evaluation and mapping of desertification status (a case study in Boushehr Province, SW Iran)
Keywords:Desertification sensitivity; ESAs model, IMDPA model; Iran
Desertification is the consequence of processes in which climate change and human activities are the most effective factors in arid and semi-arid regions, especially in a major part of Iran. The present study aims to quantitatively assess the desertification situation based on ESAs (Environment Sensitive Areas to Desertification) and IMDPA (Iranian Model of Desertification Potential Assessment) models in southwest of Iran. IMPDA model considers five indicators such as climate, soil, vegetation, erosion, water resources as main coefficients to evaluate the desertification situation. ESAs model takes the physical environment and land management characteristics such as soil, vegetation, climate, and land management for classification of desertification intensity. These layers were extracted and manipulated from the available topographic map data, geologic map, satellite image, and field survey data analyses. Spatial analyst function in ArcGIS software was used for matching the thematic layers and assessing the desertification index, of which the map of environmentally sensitive areas of study area is produced. Based on the results obtained from the IMDPA model, %49.11 of the study area is classified as severe desertification class, and %49.89 in moderate class, and quantitative value of desertification intensity for whole the study area was obtained as DSI =1.55 that is indicative of average desertification intensity in the region. Based on the results obtained from ESAs method, %3.87 of the study area is classified as the fragile class (F2), %38.78 in the average critical (C2) and also nearly %56.42 in the severe critical class (C3). The comparison results show that the IMDPA model have better performances in evaluation current desertification status from ESAs model in Iran. By noticing the evaluated factors, it is understandable that the climate factor has the intensive effect on desertification throughout the study region that they are out of control by human being.
Ahmadi, H., 2004. Iranian Model of Desertification Potential Assessment, Faculty of Natural Resources, Univ.
Ahmadi, H., Abrisham, E., Ekhtesasi, M.R., Jaafari, M., Golkarian, A., 2006. Assessment and mapping of
desertification using MICD and ICD model in FakhrAbad, Mehriz region. Desert j., (10), 165- 187
Barrow, C.J., 1997. Land degradation: development and breakdown of terrestrial environments. Cambr. Univ.
Press, New York.
Basso, F., Belloti, A., Faretta, S., Ferara, A., Manino, G., Pisante, M., Quaranta, G., Tabemer, M., 1999. The Agri
Basin In: MEDALUS Project_ Mediterranean Desertification and Land Use. Manu. Key indicat. Desertificat.
Map. Env. Sensit. areas desertificat.
Basso, F., Bove, E., Dumontet, S., Ferrara, A., Pisante, M., Quaranta, G., Taberner, M., 2000. Evaluating
Environmental Sensitivity at the basin scale through the use of Geographic Information Systems and Remote
Sensed data: an example covering the Agri basin (southern Italy). Catena j., (40), 19-35.
Black, G.R., 1965. Bulk density. In: Black CA, Evans, DD, White JL (eds) Methods of soil analysis. Part 1. Agronomy.
Madison. Amer.Soc. Agr., (9), 379–390.
Dregne, H.E., 1987. Soil erosion: cause and effect. Land use Pol. j., (4), 412-418.
Ekhtesasi, M., Mohajer, M., 1994. The Method of Iranian Classification Desertification.
European Commission., 1999. The Medalus project Mediterranean desertification and land use- Manual on key
indicators desertificat. map. env. sensit. areas desertificat., pp. 84, Eds. C.
FAO/UNEP, Land Degradation Assessment in Dry land (LAND)., 2001. United Nations Env. Progr., USA. 67.
Grumblat, J., 1991. Kenya Pilot Study to Evaluate FAO/UNEP Provis. Methodol. Assess. Mapp. Desertificat., (Gok,
Harahsheh, H., Tateishi, R., 1998. Desertification Mapping of West Asia GIS and Remote Sensing Application.
Center Env. Rem. Sens. Chiba Univ.
Iranian Forest, Rangeland and Watershed Management Organization., 2005. National action program to combat
desertification and mitigation of drought in Iran, Tehran.
Jafari, M., Zare Chahouki, M.A., Ahmadi, H., Abbasi, H.R., 2011. Evaluation of the effects of soil properties on
desertification (Case study: Segzi Pediment of Isfahan, Iran). Desert j., (16), 1-4.
Jain, H.K., 1995. Desertification in the Escap Region Land Degradation and Desertification in Asia and the Pacific
Region. Sci. Publ. Jodhpur, India. 1-7.
Kassas, M., 1995. Desertification: a general review. Arid Env. J., (30), 115–128.
Kosmas, C., Gerontidis, S.t., Detsis, V., Zafiriou, T.h., Marathianou, M., 1999. Application of the MEDALUS
Methodology for defining ESAs in the Lesvos island, European Commission., Capri, Italy, June 24-28.
Ladisa, G., Todorovic, M., Trisorio_liuzzi, G., 2002. Characterization of Area Sensitive to Desertification in Southern
Italy, Proc. Of the 2nd Int. Conf. On New Trend in Water and Env. Eng. Safety and Life: Eco-compatible
solutions for Aquatic Environmental, Capri, Italy.
Nicholas, J., Yassoglou, C., Kosmas., 2001. Desertification in the Mediterranean Europe, a Case in Greece. 200
Sadeghi Ravesh, M.H., Ahmadi, H., Zehtabian, G.H.R., 2010. Application of sensitivity analysis for assessment of dedesertification alternatives in the central Iran by using Triantaphyllou method. Env. Monitor. Assess., DOI
Shakerian, N.,. Zehtabian, G.h.R., Azarnivand, H., Khosravi, H., 2011. Evaluation of desertification intensity based
on soil and water criteria in Jarghooyeh region. Desert j., (16), 23-32.
Thornes, J.B., 1988. Erosional equilibrium under grazing. In: Bintliff J., Davidson D., Grant E. (eds.): Conceptual
Issues in Environmental Archaeology, Edinburgh Univ. Press, 193-210.
Thomas, D.S.G., 1997. Science and the desertification debate. Arid Env. J., 37, 599–608.
UNEP., 2002. Sistan Oasis Parched by Drought, Complied by UNEP /DEWP/GRID, 87 P. n. World Appl. Sci. J., 22(3).
How to Cite
Copyright (c) 2014 Fatima Bahreini, Farhad Fakhri
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.