Utilisation and conservation status of indigenous woody plant species in a sedentary pastoral production system in south-western Uganda

Abstract

Indigenous woody plant species play a significant role in sustaining pastoral production systems
in sub-Saharan Africa. Outside protected areas in Uganda, populations of useful naturally
growing woody species are threatened with extinction. Moreover, little is known about the
population structure of woody plant species in such unprotected sites to guide conservation
strategies. The objective of this study was to identify indigenous woody plant species utilised
by the pastoralists in the dry lands of south western Uganda and assess the population structure
of the species utilized. A survey involving 100 households was conducted to inventorise woody
plants in 55 nested plots of 50 m × 50 m. A total of 70 indigenous woody plant species were
utilised by the pastoralists to serve nine purposes. High utilisation of the plant species was in
the order of medicine for humans and livestock, firewood, fodder, timber, poles, shade, food and
least in crafts. The major woody plant species utilised included Vernonia ammygdalina,
Acacia sieberriana, Acacia hockii, Carissa edulis and Albizia coriaria. Allophylus sp was
valuable for all the nine purposes, though particularly for human medicine and poles.In terms
of conservation status,trees conformed to inverse J shape and bimodal patterns of population
structure, indicating current sustainable conservation in some species and an imbalance in
species with a bimodal pattern. Most shrubs reflected irregular population structure indicative
of unsustainable conservation status. Seedlings for both trees and shrubs were in the low level
of abundance, according to Braun- Blanquette cover scale. Sustainable conservation of
indigenous woody plant species in a sedentary pastoral system requires aided regeneration