بررسی تاثیرات مدیریتهای مختلف چرایی بر روی خصوصیات مرتعی (مراتع ییلاقی سبلان)

This research trial carried out in sabalan summer ranges for determining of effects of different grazing systems on rangeland characteristics. Grazing treatment that used in this research were rest-rotation grazing system , deferred rotation grazing system, rotation grazing system moderated traditional grazing system and traditional grazing without mani pulation(as indicator). For excution of this research 50 hectare suitable range selected and divided to 4 units and each unit divided to 4 sub division for carrying out of rotational grazing and the unit selected to moderated traditional grazing did not divide to subdivisions. . Each year in the time of range readiness different Factors such as total canopy and canopy of classI, II and III , total production and production of different classes, percent ofbareland and '" investigated and recorded in special forms. After analyzing of collected data in 8 years excution of research trial results showed that all grazing systems had significant effects on improvement of range and only traditional grazing had no significant effects on range characteristics. Rest-Rotation grazing system had the highest effects on improvement of rangland , increasing of palatable and desirable plants canopy, decreasing of undesirable plants and increasing of total production of range specially production of palatable species. This grazing system resulted to positive range trend and good condition of rangeland. Other grazing systems also resulted in improvement of rangeland , apparent increase in production of palatable plants , increasing of desirable plants canopy and improvement of range condition and trend.

Keywords:

نظام های چرا , مراتع , چرای تناوبی , مدیریت علفزار