4596

4324

كارشناسي ارشد

بيابان زدايي

اصفهان: دانشگاه صنعتي اصفهان ، دانشكده منابع طبيعي

1387

چهارده ، 140 ، [II] ص:مصور ،جدول ، نمودار

ص. ع. به: فارسي وانگليسي

سعيد سلطاني

عادل سپهر

88/5/12

جمال الدين خواجه الدين ، رضا جعفري

1396/09/13

كتابنامه

مهندسي منابع طبيعي

ID4324

به فارسي وانگليسي : قابل رويت در نسخه ديجيتال

Quantitive Assessment of Desertification Present Status in East of Isfahan and a Regional Model Development with Emphasis on MEDALUS Method Leila Bakhshandeh Mehr l bakhshandehmehr@na iut ac ir Date of submission March 9 2009 Department of Natural Resources Isfahan University of Thecnology Isfahan 84156 83111 Iran Degree M Sc Language Farsi S Slotani s soltani@cc iut ac ir Abstract The increasing trend of natural resources degradation threatens the human life over the world Desertification as a sign of land degradation affects many developing and developed countries Over 250 million people are directly affected by desertification in the world In addition some one billion people in over 100 countries are at risk These people include many of the world s poorest most marginalized and politically weak citizens Desertification has long been recognized as a major economic social and environmental problem of concern to many countries in all regions of the world According to the UNCCD definition Desertification is land degradation in arid semi arid and dry sub humid areas resulting from various factors including climatic variations and human activities According to this definition natural and anthropogenic processes have main roles in desertification severity and this phenomena is often produced by a multiplicity of interacting environmental and socio economic causes The MEDALUS methodology is a practical approach to assess the present status of desertification and evaluating of desertification risk In this study have been developed a regional model for desertification assessment and mapping in SEGZI plain Eastern Isfahan based on MEDALUS methodology At first step main factors and indicators affecting on desertification process were identified According to the local condition seven factors include climate soil vegetation cover ground water water erosion wind erosion and policy and management were recognized Each factor included several indicators accounting as factor quality determination These indicators quantified based on their influences on desertification process For each indicator a score ranging from 100 to 200 have been assigned and desertification weighting was extracting The weight of each factor and the weight of desertification status calculated by geometric mean Ultimately desertification status was classified in four level including low moderate severe and high severe At last the maps of these results produced by Geographical information system Results showed that 1 7 of study area classified as moderate class 34 9 classified as severe and 63 5 involved high severe class The climate and management and policy were the most important factors affecting on desertification process Key words Desrtification Assessment MEDALUS Geographical information system GIS SEGZI Plain Desertification Mapping pdfMachine A pdf writer that produces quality PDF files with ease Produce quality PDF files in seconds and preserve the integrity of your original documents Compatible across nearly all Windows platforms if you can print from a windows application you can use pdfMachine Get yours now

سعيد سلطاني

عادل سپهر

جمال الدين خواجه الدين ، رضا جعفري