Natural Vegetation Cover Dynamic under Grazing-Rotation Managements in Desert Rangelands of Tunisia

摘要

Two treatments were used to evaluate the effect of grazing intensity (continuously grazing and controlled grazing). The schedule is as follows: 1) Rest 3 years (2004 to 2007), 2) Graze 2 months (August and July) 2007, 3) Rest 7 months (September to March) 2007-2008. The grazing impact at the area of 2000 ha was by 1700 sheep and goats during two months, followed by second rest (7 months) maintain resilient range-lands and ensure a sustainable flow of rangelands goods and services to livestock. The control was at grazing system, allows animals unrestricted and uninterrupted access to a grazing unit for all or most of the grazing season. Novelty of this studies is in the new data, which demonstrates that the rest periods allow plants to recover beforethey are grazed again, and if controlled grazing can avoid overgrazing effects.