ارزيابي كيفي تناسب اراضي جهت مرتع در حوزه آبخيز آب ماهي استان فارس

چكيده انگليسي :

Qualitative Land Suitability Evaluation for Grazing in Ab Mahi Watershed Basin of Fars Province sj naghibi@yahoo com 2009 03 14 Department of Soil Science Collage of Agriculture Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiDr A Jalalian Jalalian@cc iut ac irDr Sh Ayubi Ayubi@cc iut ac irAbstractThe term of Sustainable Development has been recently established which consists of five subsets resources environment population economy and society In order to reach to a sustainabledevelopment it is necessary to know and exploit resources and environment in its optimum way Thehigh extension of rangelands to almost 90 Mha approx 54 of the country s and also theimportance of rangelands for other issues such as soil and water conservation desertificationprevention foliage production and watershed basins hydrologic regiments control makes this topic animportant one to be studied and investigated in different perspectives In spite of these positive points this issue is not considered as much as it should be in the natural resources studies The rangelandsuitability evaluation has an outstanding role in its management The present study has been performedin the Ab Mahi watershed with the area of 15 800 ha located at north west of Fars province calledMarvdasht city The main objectives of this study were to evaluate of selected watershed qualitativeland suitability for grazing by goat and sheep based on Kekem framework and also modified FAOmethod and to use of spectral reflectance of satellite images for modeling and estimation the percentageof vegetative cover and to identify limiting factors for grazing in the understudy watershed At firststep after data collection and preparing the needed facilities primary field studies were done and theland unit components were established as the homogeneous executive units Then field studies such asexcavating of soil profiles in each working unit in order to update the soil map of the region soilsampling for laboratory studies were collected from each soil horizon after soil description usingUSDA manual Moreover the necessary land form data to run both the Kekem and modified FAOmodels Furthermore in the 70 plots the percentage of canopy were estimated in the field studies Inthis regard the coordinates of each point was determined using GPS Garmin model Theseinformation were used in order to construct the vegetation cover incorporated with ETM imagerydata To obtain a reliable vegetation map six main bands of ETM and 26 artificial imagery wereapplied to training data set in ILWIS software Finally the overall accuracy of prediction was calculatedby coefficient of determination r2 and root means of square error RMSE The constructed vegetationcanopy map was used in land qualitative evaluation of rangeland for the study area There were somedifferences in the results came from running both Kekem and modified FAO models in the Ab Mahiwatershed these differences mainly related to the selected factors and the difference in their ratings intwo approaches It was also found that physical characteristics such as steep slope abundance of soilsurface gravel erosion and vegetative land cover deficiency related to over grazing were the mostimportant limiting factors which can decrease the suitability of Ab Mahi watershed for grazing At last It was shown that it is possible to model and determine the vegetative land cover percentage with anacceptable accuracy using satellite images ETM and implementing appropriate digital analysis Keywords Land suitability evaluation rangeland grazing Kekem FAO

نقيبي، جواد

ارزيابي كيفي تناسب اراضي جهت مرتع در حوزه آبخيز آب ماهي استان فارس

روش ككم , روش تعديل شده فائو , سيستم اطلاعات جغرافيايي GIS , فيزيوگرافي هواشناسي