Study of back and forth role in wind erosion of dry land region, case ‎study: dry bed of Hamoon lake in Sistan area

Duststorms occur generally in Sistan region. So، it limits the development of the region. Many factors play especial role on duststorms such as removal of vegetation cover due to automobile transportation. The aim of this research was to identify car transportation role in producing dust storm. For this reason، three sites with different characteristics were chosen and in each area، two sites of 600 and 300 m length and wide respectively were selected with and without car transportation. Three soil samples were taken randomly from the first، mid and the end of the sites of each location and they were analyzed for pH، EC، CaCO3، organic carbon، moisture، calcium and vegetation cover. The soil erosion measured according to the Universal Soil Loss Equation. The results showed that the car transportation areas have less amount of clay، vegetation cover، topography، soil surface roughness، organic carbon، but، they have an increase in soil small particles with less than 0. 84 mm in diameter، pH، EC، CaCo3and land length which they have especial effect on wind erosion of the region. Results also show that the amount of soil erosion is 15. 8-216. 3 tonsperhectare in study area.