Piosphere Syndrome and Rangeland Degradation in Karamoja Sub-region, Uganda

摘要: Uganda like most African countries is a vast mosaic of diverse and contrasting landscapes. Much the country characterized by an equatorial vegetation but with significant dryland areas mostly pronounced in northeastern sub-region Karamoja. In this sub-region, pastoral agro-pastoral population dependent artificial waterholes. locale these waterholes, livestock generate altered soils known as piospheres. However, since introduction limited research has been undertaken to investigate their impact on rangeland degradation sub-region. study, soil chemical physical properties were sampled at 0-15 cm 15-30 depth, herbaceous woody species assessed series (1986, 2000, 2013 2015) Landsat imagery utilized. Standard laboratory procedures utilized analyze samples while summarized based relative abundance. Dark Object Subtraction 1 atmospheric correction method was performed all prior classification. The Soil-Adjusted Vegetation Index (SAVI) used determine sensitivity degradation. extent from waterholes proximity analysis basing distance intervals (0.1 km-15 km) waterhole. A high pH observed closer nitrogen phosphorus lower. There variation abundance between wet dry seasons predominance perennial hardy Results also revealed that inflection point become established around piospheres expanding outward 1.5-2 km piosphere centre; indicating development clearer pattern. piospheric gradient (up 15 demonstrated landscape heterogeneity existence potential interaction area 6.5 9 we have called convergence zone new higher impact. It therefore imperative strategic management stay further outward. This information generated relevant range water managers separating impacts localized health Karamoja