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Abstract

ABSTRACT A one hectare livestock enclosure was established at Banda Daud Shah in 1972, to study changes in vegetation and secondary succession. In May, 1978 vegetation in the exclosed and adjacent grazed areas was sampled to detect change in vegetation. Average yield and species composition of grasses, forbs and trees/shrubs were not significantly different in the exclosed and adjacent grazed areas. The higher ( P = 0, 05) forage production and composition of Aristida depressa in the grazed area showed that this species increased under continued grazing. Frequency of grasses, forbs and trees/shrubs was not affected by the exclusion of livestock. The data indicate that direct manipulations In semi-arid environment are essential for rapid improvement of overgrazed rangelands and secondary succession.