Comparison of effects of planting Haloxylon spp. and Atriplex spp. on the characteristics of vegetation cover and ranglands soil (A case study: Salemabad, sarbishe, Iran)

The aim of this research was to investingate the effects of Haloxylon(Haloxylon persicum, Haloxylon amodendron) and Atriplex (Atriplex canescens, Atriplex lentiformis) planting on soil and vegctation cover of the region in which those spices were pluted. After identifying the regions, the three sites selected in neighbourhood are as follow: the region planted with (Atriplex spp), planted with (Haloxylon spp) and a site with native species (the average area of each site was about 340 ha). Vegetation and soil parameters were measured by a random systematic method, In each region. three 500 meter transects were established, 30 plats by the average of 10m× 10m along with subplots of 1m ×2m were selected and vegetation cover Parameters such as Percentage canopy cover , Production and percentage litter in two levels of upperstorey(shrubs) and understorey were measured. Also soil samples were taken from 0-20, 20-80cm soil depth and some parameters were measured such as pH, Ec, Sodium(Na), Calcium(Ca), organic matter(OM), Nitrogen(N), Phosphorus(P) and Potassium(K).The soft are of SAS and also Variance method was used for data analysis.This research shows that canopy cover, have been increased, production and percentage of litter. Also, analysis of chemical parameters show that planting of Atriplex spp resulted in a significant increase in pH and a decrease in Ca. planting of Haloxylon spp cause an increase in pH and decrease in Na,Ca, OM,P and N. Considering the results of vegetation cover and chemical properties of soil under planting of mentaining species in order to rangland improvement,the Haloxylon spp is proposed as a better species plant for planting as before.