The impact of utilization of rangelands on soil carbon mineralization kinetics ( Case study: Saderabad of Nodoushan steppe (rangelands in Yazd province

Grazing affects the nutrient cycle in the soil. Therefore, in order to investigate the effect of rangeland utilization on vegetation and as a result of carbon mineralization kinetics, Sadrabad Nodoshan rangelands of Yazd province were selected.The canopy cover and production was measured in three areas of enclosure, medium grazing and heavy grazing. Soil samples were sampled from a depth of 0-15 cm in a systematic random method. First, nitrogen, carbon, carbon to nitrogen ratio (C / N) of plant samples, nitrogen, carbon, lime, soil texture, pH, soil EC were measured. Then the soils of severe grazing area were selected for treatment and by increasing by 1% the organic carbon of Artemisia sieberi and Peganum harmala including control of 100% of Ar.si, 75% Ar.si and 25% Pe.ha., 50 % Ar.si and 50% Pe.ha, 25 Ar.si and 75% Pe.ha and 100 % Pe.ha were treated. The results showed Pe.ha residues have good degradability due to having less C / N than Ar.si. In all treatments, the process of carbon mineralization in the two study areas had an exponential distribution. Organic carbon mineralization in the soil of the two areas under Heavy grazing and exclusion is similar during the first week, but over time, carbon mineralization in the heavy grazing soil treatment with 100% Pe.ha is higher than other treatments. Therefore, the rate of carbon to biodegradation in areas with heavy grazing, is high and these lands have less carbon stabilization.