Comparison the Amount of Existing Mineral Elements in Plant Aerial Parts, Litter and Soil of Three Range Species in Taleghan Region

The aim of this research was to compare the amounts of existing mineral elements in plant aerial parts, litter and soil of three range species (Bromus tomentellus, Psathyrostachys fragilis, Agropyron tauri) in order to investigate the litter effect of species on soil properties of Taleghan rangeland. The measured mineral elements include carbon, nitrogen, phosphorous and potassium. After selection of the appropriate plant species and suitable sites, random- systematic sampling method was used to plant aerial part, litter and soil sampling. Soil data were taken of 0-3 cm depth and in addition to above mineral elements, soil texture, EC, pH and lime percentage was measured in soils of the sites. The data was analyzed by analysis of variance (ANOVA), Duncan’s test and t-test. Results of analysis of variance of different elements showed that the amounts of nitrogen, carbon and C/N ratio of the species litter had significant differences, so that A. tauri had the highest concentration of nitrogen and B. tomentellus had those of Carbon and C/N ratio. Results also indicated that there are significant difference among the amounts of nitrogen, phosphorous and carbon in plant aerial part of the mentioned species (P<0.01). P. fragilis had the highest amount of nitrogen and both P. fragilis and B. tomentellus had higher amount of carbon and phosphorous than A. tauri. Soil under the species and control showed significant differences so that the mentioned species improve soil productivity. Totally, A. tauri had the highest litter quality and decomposition rate.