خلاصة:
There are different models for mapping and evaluation of desertification condition, such as global
FAO_UNEP model. There are also several models for evaluation of desertification in Iran. In this study, tow fol/owing methods was used: 1-ICD method, (Iranian Classification of Desertification).
2- MICD method, (Modified Iranian Classification of Desertification).
In this research, at first, these models were considered and indices and factors were improved. Then, working unit map in this region was made by geomorphologic method and land use of each working unit was determined. This map has 14 working unit. At last, evaluation of desertification condition was determined in this region by ICD and MICD methods. The results methods were: - In ICD method, from an intensity of desertification point of view, Fakhrabad -Mhriz region is in low and medium classes. In this region the low class is about 82351 hectare (91.59%) and the medium class is about 7565 hectare (8.41%) of total area. In MICD method, this region has four classes of calm, low, medium and high. The calm class is about 33327 hectare (37.06%), low class is about 8346 hectare (9.28%), medium class is about 37245 hectare (41.42%) and high class is about 10998 hectare (12.23%). According the results of this investigation and by comparing them with the condition which have been observed in the Fkhrabad-Mehriz region, the MICD is better method for evaluation of desertification condition in this region.
ملخص الجهاز:
Lack of coinciding the major and secondary processes of the model with the local and regional characteristics 37 BIABAN Journal Vol. 10, No. 1-1 5- Lack of ability to separate natural and anthropogenic factors of desertification 6- Lack of considering regional biomes of the Middle East countries including Iran The objectives of current study are as follows: 1- Investigation of efficacy, advantages and weaknesses of ICD and MICD methods 2- Preparation of the current condition of desertification map with empasis on wind erosion in Fakhrabad-Mehriz basin 3- Determination of major and secondary factors of desertification in each region 4- Introduction of the benchmarks and indicators of desertification in the study area.
Materials and methods Steps of desertification assessment based on ICD method: 1- Determination the types of deserts: Several base maps of landuse and vegetation cover of the region were considered to determine natural desert landscapes and then, work unit map consists of geology, topography and geomorphology maps was prepared (Table 1).
The results of scoring and evaluation of ICD method (level of desertification intensity, natural landscape of each working unit, type of desertification (anthropogenic "A" or environmental "E" and effective factors) are summarized in table 8 and MICD in tables 9-11.