چکیده:
The kind of land use and intensity of its change is considered as important desertification indices in different models. Land use change is one of the main anthropogenic factors in the desertification. The current research was carried out around Imam Khomeini airport, with an area of 32000 km2, in order to evaluate mentioned area's land use changes effects during 1955-2003 on desertification. To study the changes, aerial photos of 1955 (1:55000) and 2003 (1:40000), in addition to IRS (Pan and LISS III) and ETM images of 2003 were used. Boundaries of different land uses were determined based on aerial photos and satellite images. In the next stage, boundaries were controlled in the field. Five kinds of land uses including agricultural land, abandoned agricultural lands, rangelands, industrial regions and complex, were distinguished in the study area. The extent of land uses areas, except to complex, has been changed during the 48 years. Rangeland has least change (1.5%), while 14% of agricultural areas have been changed into abandoned and industrial areas. This research showed that biomass has been decreased to 24355.6 ton during the last 48 years. This leads to the decrease of organic matter and decline of soil quality, which in turn causes a 32.9% increase of area regions with severe and very severe desertification intensities.
خلاصه ماشینی:
Shafizadeh Nasrabadi4 1- Professor, Faculty of Natural Resources, University of Tehran, 2- Associate Professor, Faculty of Natural Resources, University of Yazd, 3- Researcher, Watershed Management and Soil Conservation Research Institute Abstract The kind of land use and intensity of its change is considered as important desertification indices in different models.
Key words: Iran, Desertification, Imam Khomeini airport, Land use, Satellite images Introduction Population increase, industrial activities development and limited natural resources have severe effects on the environment and degradation and pollution of land, air and water resources are the consequences of such effects.
Tazeh (2004) studied the effect of land use change on desertification in Yazd urban area over 1965-2002 period using tectogenic desertification indices (caused ٢ BIABAN Journal Vol 11, No 1 (2006) PP.
Ekhtesasi Mohajeri (1996) considered change of agricultural lands, forest and rangelands to non-productive areas such as road, urban and residential region in Iranian classification of desertification in Iran (ICD).
Based on the objective of current research to detect land use change in the airport over the period 1956-2003 aerial photo of the region for 1956 in the scale of 1:55000 was obtained and the area of different landuses were determined.
1-8, Ahmadi et al (View the image of this page) Figure 3: The desertification assessment map of studied area prepared using wind erosion indicator for 2003 Conclusion The study of different land uses around Imam Khomeini Airport shows that five types of landuses including agriculture, bare range, other type and infrastructures have been encountered to changes over past 48 years.