Soil salinity is one of the major environmental problems that lead to crop yields failure and exacerbation of desertification in natural resources area.
The purpose of this study is to deliberate human’s role in desertification. To achieve this purpose we’ve used vegetation destruction and land management criterion which land management creteria is including agriculture land management, rangeland management, mineral land management indecises and vegetation destruction criteria is including plant cover percentage, range trend, resistance against drought and conservation against erosion indecises. The data of each indicator imported to Arc GIS 9.3 after statistical analyzes and normality test with kolmogorov- smirnov method in SPSS.
Wetlands are important ecosystems which have mostly been dried due to inappropriate management. In drying process, wetlands are converted into desert-like conditions in long term.
The aim of this study was to evaluate the status of the soil criteria for assessment of desertification and comparison of soil criteria maps produced by kriging interpolation with maps produced by help of satellite imagery.
Drought and water shortage have become major challenges in our country in recent years. An increase in drought occurrence may increase the risk of fire in forests and rangelands which can have many negative impacts on human life and environment. In recent decades, various approaches for fire risk mapping in forests and rangelands have been presented and applied to climate and Land Surface Temperature(LST) remote sensing data such as Keetch-Byram Drought Index(KBDI).
Monitoring the effects of precipitation on vegetation has great importance in range management. Nowadays, satellite images are used as a low-cost and fast method for vegetation study in different scales. This study aimed to monitor vegetation cover in four range types in the south of Isfahan during 1999-2009. Five Landsat images were used to calculate NDVI index. All images were taken in the last month of spring.
Monitoring of drought and vegetation change is one of the most important solutions for natural resource management. Nowadays, satellite images are used as a low-cost and fast method for vegetation study in different scales. Vegetation change is assessed using spectral characteristics. The aim of this study is to analyze and monitor the changes of vegetation cover in 4 rangelands and one forest type in in south of Esfahan and southeast of Chaharmahal and Bakhtiary in 1999-2009. To measure the vegetation change, 5 Landsat images were prepared in first half of Khordad.
Gavkhouni playa as a Quaternary heritage in Iran, has experienced various climate events and is geomorphologically an important region. It is the deepest area in the Zayanderood watershed in Esfahan province. Due to presence of Gavkhouni wetland and sand dunes in the playa, ecotourism is an important activity. It is clear that a healthy and watery lake can support a high density of vegetation cover and conserve groundwater levels in the coastal regions.
Drought is a natural disaster which occurs in all climate regimes and causes environmental, social and economic crises. There is no universal definition for that but it is broadly defined as "severe water shortage". Assessment and monitoring of this phenomenon due to its creeping status and large spatial coverage is difficult especially using ground-based measurements. To detect drought, we need a tool that can provide information about temporal and spatial distributions of this phenomenon.