selecting the most suitable nebka species type for quicksand stabilization using ahp model (case study: najjar abad erg, northeast of toroud)

occurrence of environmental issues and loss of natural resources are the important causes of risk and crisis management strategies of the environment. the influx of quicksand into settlements, communication ways and economical installations is one of the most important environmental problems in the eastern north of toroud. the environmental system reacts against of quicksand stress, and is trying to adjust the pressure of wind erosion by creation of nebka ecosystem. thus, the development of nebka landscape can be as element in order to preserve the coordination among environmental forces, and reduce the destructive impacts of quicksand on humane systems. the aims of this study are the comparative grouping of nebkas in the eastern north toroud using ahp model, and presentation of the most suitable of nebka species for stabilization of mobile sand via analyses of their morphometric parameters. for this achievement, first, the most important morphometric parameters of 67 nebkas, such as nebka volume, nebka height, plant canopy cover, plant height and nebka diameter, from haloxylon, tamarix, seidlitzia and alhagi species were measured by linear sampling in field. then, the studied nebkas were prioritized using comparative evaluation by ahp model. the results show that haloxylon species nebka with weight of 0.505 has the highest of priority for stabilization projects of quicksand. tamarix species nebka with weight of 0.302 has less importance than haloxylon species nebka, but it has higher priority than seidlitzia and alhagi species nebka. therefore, for implementation of stabilization projects of quicksand, primarily development of haloxylon species nebka and in the second stage development of tamarix species nebka has the highest of efficiency.