Saeid Gharachelo; Mohamad reza Ekhtesasi; Mojtabah Zareian Jahromi; Mohamad bagher Samadi
Volume 17, Issue 3 , October 2010, , Pages 402-420
Abstract
Nowadays, desertification is one of the ecological crises of the world. To control desertification, having a clear understanding of its factors and processes is necessary. Khezr Abad-Hemat Abad region of Yazd with area of 242 Km2 was considered to evaluate current condition of desertification using ICD. ...
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Nowadays, desertification is one of the ecological crises of the world. To control desertification, having a clear understanding of its factors and processes is necessary. Khezr Abad-Hemat Abad region of Yazd with area of 242 Km2 was considered to evaluate current condition of desertification using ICD. Iranian Classification of Desertification (ICD) was presented by M. Ekhtesasi and S. Mohajeri in 1995. First of all, available data were collected and basic studies were done. The data were entered in GIS and basic maps were produced through interpretation of aerial photos and satellite images using Arcview and Ilwis software. Eight desert homogenous units were separated according to the studies and by overlaying geomorphology, land use and vegetation cover maps. In next stage, effective factors in desertification including three environmental factors, three anthropogenic factors, soil erosion index, resilience potential and reconstruction of ecosystem were scored in a range of 0-10. Afterward, according to the sum of scores and comparing with table of desertification severity index, final desertification map was produced. The result showed that 81.53% of the region was in middle class of desertification while 18.47 % was in severe class. The environmental factors were determined as the main factor in desertification of 81.53 % area of the studied region while 18.47 % of that was affected by anthropogenic factors. Most main criterion in desertification of this region was water degradation process
Morteza Akbari; Hamid reza Karim zadeh; Reza Modares; Bahareh Chakoshi
Volume 14, Issue 2 , January 2007, , Pages 124-142
Abstract
Desertification is the ecologic and biologic reduction which may occur naturally or non naturally. Desertification process usually effects arid and semi arid region and reduce the land efficiency very rapidly. This study has been conducted to evaluate and classify desertification with the aim of geographic ...
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Desertification is the ecologic and biologic reduction which may occur naturally or non naturally. Desertification process usually effects arid and semi arid region and reduce the land efficiency very rapidly. This study has been conducted to evaluate and classify desertification with the aim of geographic information system and remote sensing techniques. In this study, TM data of 25 shahriver 1369(16 October 1990) and ETM+ data of 16 shahrivar 1380 (7 October 2001) were used. Geometric, radiometric and sun height angle correction were carried out on the images. Supervised and unsupervised classification were used for both two images and 9 land uses were classified and compare quantitatively due to geomorphology and desertification attributes. Each main and partial desertification factor was input to geographic information database and scaled to make the map of desertification severity based on recommended method for Iran and FAO map of desertification vulnerability. The result of desertification severity which shows desertification condition, velocity and potentiality, showed that natural desertification occurs in 35 % of area with different medium, high and very high desertification severity. Anthropogenic desertification includes 65 % of study area with high and very high condition. But in desertification vulnerability map, very high desertification vulnerability was determined in 20 % of area with simultaneous human and animal effect and high desertification vulnerability was determined on 80 % area with only animal effect. According to the map, for arid region of north of isfahan, it was identified that range land use change to agriculture, improve agricultural patterns, over grazing, incident economic condition and ground water over exploitation are the most important anthropogenic factor, and drought and soil and water salinity are the most important natural factors. Desertification trend is enhancing to north west of the study area which will make trouble for rangelands, residential and industrial areas.