Comparison the amount of N, P, K, C and C/N in litter of three range species and soil in order to determine the influence of those on soil quality indices (Case study: Taleghan)

The object of this research was to compare the amount of N، P، K، C and C/N in litter of three range species including Bromus tomentellus، Agropyron tauri and Psatyrostachys fragilis in order to determine the influences of these elements on soil quality indexes. Soil and litter sampling was done at the end of growing season (summer 2009) after identification the sites of these species in Taleghan. Sampling were conducted in the key area of each site based on random-systemic method. The samples were collected and transferred to laboratory، the amount of C، N، K، P، C/N ratio in litter and pH، EC، Lime and texture in soil were determined. After investigation of data، their analyses were performed by T. test analysis، analysis of variance and Duncan. The result of variance analysis showed that there was significant deference between of C، N and C/N ratio in litter of these species. The maximum of N was related to A. tauri and the maximum of C and C/N ratio was related to B. tomentellus. Comparison of under plant soil and control area showed that there was significant deference between under plant soil and control area and above species was increased soil fertility. In generality A. tauri was better than two other species in litter quality، speed of degrade ability and its effect on soil conditions.