Ammar Rafiee Emam; Gholamreza Zehtabian; Amir Houshang Ehsani
Volume 11, Issue 3 , August 2019, , Pages 323-342
Saeed Rashvand; Jamal Mosafaee; Mohammad Darvish; Ammar Rafee emam
Volume 20, Issue 1 , June 2013, , Pages 38-49
Abstract
Vegetation and biological production is one of the most important factors in providing human needs and sustainability of ecosystems and living organisms. Otherwise, the natural lands will become desert and non-residential regions. Deterioration of vegetation is one of the major causes of desertification. ...
Read More
Vegetation and biological production is one of the most important factors in providing human needs and sustainability of ecosystems and living organisms. Otherwise, the natural lands will become desert and non-residential regions. Deterioration of vegetation is one of the major causes of desertification. In the current research, the assessment of desertification in terms of deterioration of vegetation was performed using the FAO and UNEP method in Rood shoor, Qazvin. For this purpose, the digital map of potential vulnerability was generated from geometric mean of three indices including moisture regime, temperature regime, soil depth and texture. For digital mapping of perennial to annual plants ratio, the map of vegetation types (31 even vegetation types) was prepared and in each type four plots were established in order to record the production and canopy cover percentage. Finally, the final map of potential desertification was generated and classified by the integration of digital maps of potential vulnerability and perennial to annual plants ratio. From the total area of the sub basin which is equal to 2275000 hectares, agricultural lands and non rangelands (1034745 ha) which covers 46 % of the sub basin were not assessed in the classification. The rest was classified as follows: 31685 ha (low), 1191394 ha (medium) and 17176 ha (high).
Seyed Jafar Seyed Akhlaghi; Hamid Reza Abbasi; Ammar Rafiee Imam; Mohammad Darvish
Volume 19, Issue 3 , December 2012, , Pages 498-511
Abstract
Desertification is a multifactorial phenomenon and relates to different aspects. Thus, this concept can be studied around multiple axes in natural resources and environment. Nowadays, the rapid growth and huge population in environments and ecological areas are of the most important concerns that have ...
Read More
Desertification is a multifactorial phenomenon and relates to different aspects. Thus, this concept can be studied around multiple axes in natural resources and environment. Nowadays, the rapid growth and huge population in environments and ecological areas are of the most important concerns that have attracted the attention of experts and planners to the concept of desertification or combat desertification .On the one hand, astounding growth of metropolises and unbridled industrial development have led to adverse outcomes for the residents. Moreover, land is a limited resource and the situation will get worse over time in many countries due to the exponential growth of population and extensive use of land and with regard to the fact that only 5 million km2 of the earth has remained for sustainable utilization in future. There are many issues surrounding population supporting capacity based upon the quality of the land in order to maintain the sustainability of resources and environment. The purpose of this article was to estimate population supporting capacity of Tehran and Alborz on the basis of the potential of land units through the method introduced by Central Department of Agriculture of USA. This is the first step to determine the extent of land degradation and detection of man-made desertification. In the current situation, it is obvious that a demographic development of Alborz and Tehran provinces has led to instability in the environment and desertification. Based on the results, classes 1, 4 and 9 of the land quality covered 20.38, 14.93, and 37.44 percent of the surface area, respectively. These three classes could be accounted for 81.9% of population supporting capacity according to the potential of production. Our results showed that lands of the study area were exposed to desertification classified as very high risk (38.55 % of the total area), high risk (25.06 % of the total are), moderate risk (23 % of the total area), and low risk (13% of the total area). Accordingly, it was found that the current population of Tehran province was 5 times higher than the optimal population. This ratio also reaches 4.7 times in high-density areas such as Tehran, Karaj, Shahriar and Robat Karim.