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DETECTING DESERTIFICATION PROCESSES USING TM AND ETM＋ DATA, NORTH OF ISFAHAN, IRAN

植物生态学报 2008年第2期32卷 328-335页

作者： khajeddin sj Akbari M Karimzadeh HR Eghbal MK Department of Natural Resources lsfahan University of Technology lsfahan 84156-83111 lran and Department of Agriculture Isfahan University of Technology Isfahan 84156-83111lran

Aims Desertification results in ecological and biological diminution of the earth,and can happen naturally or cause by anthropogenic *** process especially affects arid and semi-arid regions,such as the Isfahan region,where the spread of desertification is reaching critical *** aim of this study is to use remotely sensed data to review the trend of desertification in the northern of Isfahan,*** Multi-temporal images were employed to evaluate the trend of desertification,specifically the TM and ETM+ data of September,1990 and September,*** and radiometric corrections were applied to each image prior to image processing and supervised classification,and vegetation indices were applied to produce a land use map of each image in nine *** land use classifications in the two map images were compared and changes between land use classes were detected over the 11 year period using a fuzzy and post-classification *** findings The maps and their comparison with false color composite images showed the differences *** the fuzzy and post-classification method the land use changes were sited on the *** confirmed 53% changed area and 47% unchanged areas in the study *** results verify the desertification expansion in the study *** of poor land management,agricultural lands converted to desert and abandoned areas,and some marginal pasture lands had to be changed to agricultural land which are desertification spreading according to United Nations Conference on Desertification(UNCOD).Also farmland and pastures have been converted to urban and industrial areas,and the rangelands have been spoiled due to opencast mine *** the mine margins eroding as well as their debris accumulating on the pasture lands,desertification has become *** areas of less-elevated mountains have remained *** study confirmed that the anthropogenic activities accelerated the des

关键词：遥感技术生态环境土壤分级荒漠化

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