Chin J Plan Ecolo ›› 2008, Vol. 32 ›› Issue (2): 328-335.doi: 10.3773/j.issn.1005-264x.2008.02.009

• Research Articles • Previous Articles     Next Articles

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

Khajeddin SJ1; Akbari M1; Karimzadeh HR1; Eghbal MK2   

  1. 1Department of Natural Resources, Isfahan University of Technology, Isfahan 84156-83111, Iran; 2 Department of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran
  • Online:2008-03-30 Published:2008-03-30
  • Contact: Khajeddin SJ

Abstract: Aims Desertification results in ecological and biological diminution of the earth, and can happen naturally or cause by anthropogenic activities. This process especially affects arid and semi-arid regions, such as the Isfahan region, where the spread of desertification is reaching critical proportions. The aim of this study is to use remotely sensed data to review the trend of desertification in the northern of Isfahan, Iran.
Methods Multi-temporal images were employed to evaluate the trend of desertification, specifically the TM and ETM+ data of September, 1990 and September, 2001. Geometric 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 classes. The land use classification s 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 technique.
Important findings The maps and their comparison with false color composite images showed the differences efficiently. With the fuzzy and post-classification method the land use changes were sited on the map. Fuzzy confirmed 53% changed area and 47% unchanged areas in the study region. The results verify the desertification expansion in the study areas. Because 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 excavations. With the mine margins eroding as well as their debris accumulating on the pasture lands, desertification has become worse. Three areas of less-elevated mountains have remained unchanged. This study confirmed that the anthropogenic activities accelerated the desertification process and severely endangered the remaining areas.

No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] . [J]. Chin Bull Bot, 1994, 11(专辑): 19 .
[2] Xiao Xiao and Cheng Zhen-qi. Chloroplast 4.5 S ribosomol DNA. II Gene and Origin[J]. Chin Bull Bot, 1985, 3(06): 7 -9 .
[3] CAO Cui-LingLI Sheng-Xiu. Effect of Nitrogen Level on the Photosynthetic Rate, NR Activity and the Contents of Nucleic Acid of Wheat Leaf in the Stage of Reproduction[J]. Chin Bull Bot, 2003, 20(03): 319 -324 .
[4] SONG Li-Ying TAN Zheng GAO Feng DENG Shu-Yan. Advances in in vitro Culture of Cucurbitaceae in China[J]. Chin Bull Bot, 2004, 21(03): 360 -366 .
[5] Shi Jian ming;Gui Yao-lin and Zhu Zhi-qing. Observation on Amitosis of Sugarbeet (Beta vulgaris) Petiole during Dedifferentiation in Vitro[J]. Chin Bull Bot, 1989, 6(03): 155 .
[6] LI Jun-De YANG Jian WANG Yu-Fei. Aquatic Plants in the Miocene Shanwang Flora[J]. Chin Bull Bot, 2000, 17(专辑): 261 .
[7] XU Jing-Xian WANG Yu-Fei YANG Jian PU Guang-Rong ZHANG Cui-Fen. Advances in the Research of Tertiary Flora and Climate in Yunnan[J]. Chin Bull Bot, 2000, 17(专辑): 84 -94 .
[8] Sun Zhen-xiao Xia Guang-min Chen Hui-min. Karyotype Analysis of Psathyrostachys juncea[J]. Chin Bull Bot, 1995, 12(01): 56 .
[9] . [J]. Chin Bull Bot, 1994, 11(专辑): 8 -9 .
[10] Yunpu Zheng;Jiancheng Zhao * ;Bingchang Zhang;Lin Li;Yuanming Zhang . Advances on Ecological Studies of Algae and Mosses in Biological Soil Crust[J]. Chin Bull Bot, 2009, 44(03): 371 -378 .