Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Ecological studies in the vegetation of the Sudan. 2. The ecological relationships of the vegation of Khartoum Province.

Abstract

The distribution of grassland depended on soil depth, Aristida funiculata communities being found on shallow soils and Panicum turgidum communities on deep soils. Perennial species seriously affected by grazing in Khartoum province, where overgrazing is general, included P. turgidum, Crotalaria thebaica, Tephrosia uniflora, T. vicioides, Indigofera suaveolens and Acacia spp. Capparis decidua, Ziziphus spina-christi and Maerua crassifolia would normally be trees but were often reduced to stunted undershrubs where grazed. Near water points the only species which survived were the unpalatable Cassia senna and the prostrate Corchorus depressus. P. turgidum growing in an enclosure at Jebel el Hardan was 46 cm tall and had 8% cover compared with 15 cm tall and 2% cover without protection; ephemerals yielded 140 g DM/m2 inside the enclosure and 32 g/m2 outside.