كليدواژه :
Soil loss , چاي بيش از حد ظرفيت , livestock management , چراي متعادل , Firuzkooh , كرت هاي فرسايش , كشاورزي , رواناب ها , منابع طبيعي , تلفات خاك , مديريت دام , Overgrazing , Equilibrium grazing , Slope , Runoff , Erosion plots , مراتع
چكيده لاتين :
The total rangeland area and number of livestock are reported millions hectare and 133 million stock-units respectively. Responsible organizations and experts believe that overgrazing is the most important factor on range degradation. Range degradation, has several negative impacts like lose of water and soil resources, flooding and sedimentation. For determining the impact of overgrazing in different slops we executed a research in Firuzkooh, which is, an important livestock-husbandry region of Iran. For this purpose 18 plots of 2x10 meter, have been constructed on 10, 20 and 30 percent slopes with equilibrium and over grazing treatments with three repetitions in randomized blocks design. Runoff and soil loss of 6 periods in 2 years were measured. Results represented that the maximum and minimum soil losses were related to overgrazing on 30 % and equilibrium grazing on 20 % slopes respectively. Analyzing the variance showed that the slope and grazing treatments had significant effect on runoff and soil loss in long time.
