Abstract
Spatio-temporal dynamics of pastoral grazing resources influences the pastoral production system. Obtaining timely and reliable information on the status of these resources will support planning and early response to climatic variability. This study in Karamoja pastoral sub-region of Uganda identified herbaceous and woody forage species in different grazing land cover types, quantified forage in different grazing land covers, analyzed long-term land use/cover change (from 1986 to 2013) and determined the relationship between Normalized Difference Vegetation Index (NDVI) and herbaceous biomass. Results showed that the sub-region has over 30 grass species that provide forage. During the wet season, woodlands, grasslands and thickets and shrublands recorded a wet weight of 1,342.5 ± 104.5 kg/ha, 857.5 ± 29.4 kg/ha and 501 ± 43.9 kg/ha, respectively. In the dry season, 542.5 ± 57.6 kg/ha, 273 ± 6.4 kg/ha and 140 ± 9.2 kg/ha were realized in the woodlands, grasslands and thickets and shrublands, respectively. However, in the transitionary season, 276, 512.5 and 529.2 kg/ha were obtained in the woodlands, grasslands and thickets and shrublands accordingly. Similar trends were observed in dry matter biomass in the respective land cover type. Seasonality, land cover type and location accounted for the variations in the observed forage quantities. Analysis of land cover and land use change revealed a tenfold increase in croplands in the last 13 years. The expansion of crop cultivation is attributed to interventions by the Government of Uganda and development partners to promote food security in the sub-region. Heightened bushland encroachment was similarly observed in the last 13 years. The study also found a significant positive relationship between NDVI and herbaceous biomass, indicating that remote sensing offers reliable resource assessment and monitoring options for informing planning and interventions in semi-arid areas.
Highlights
Livestock rearing has continued to play a significant role in the economy and welfare of Uganda
Herbaceous and woody forage plants in Karamoja In the thicket and shrubland land cover, there were 12 grass, 11 herb, 4 shrub, and 6 tree species respectively distributed in 13 families (Table 2)
This study was commissioned with the main objectives of quantifying forage in the different grazing land use/ cover types in Karamoja and providing a long-term portrait of how these grazing land use/cover types have changed
Summary
Livestock rearing has continued to play a significant role in the economy and welfare of Uganda. About 71% of households in Uganda owned livestock in 2008 (MAAIF and UBOS 2010). Previous estimates were of livestock and livestock products accounting for over 5% of the gross domestic product (GDP) and about 14% of the agricultural GDP as well as a range of valuable services and products for domestic and export markets (FAO 2005). Newer estimates show that livestock contributes up to 3.2% to national GDP, larger than the GDP derived from either cash crops or fishing. Karamoja's livestock alone constitute about 10% of the national livestock herd, 20% of the national cattle herd, 16% of goats, 60% of all horses, 97% of all camels and 91% of all donkeys in Uganda (MAAIF and UBOS 2010)
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