Spatio-temporal dynamics of forage and land cover changes in Karamoja sub-region, Uganda
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Date
2014
Journal Title
Journal ISSN
Volume Title
Publisher
Pastoralism
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.
Description
Keywords
Dry matter, Bush encroachment, Above-ground herbaceous biomass, Heterogeneity
Citation
Egeru, A., Wasonga, O., Kyagulanyi, J., Majaliwa, G. J., MacOpiyo, L., & Mburu, J. (2014). Spatio-temporal dynamics of forage and land cover changes in Karamoja sub-region, Uganda. Pastoralism, 4(1), 1-21. Doi: 10.1186/2041-7136-4-6