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In developing countries, little information is available about solid-waste characteristics, determinants for adoption and performance-evaluation of municipal-waste management systems in Municipals. This study aimed: to characterize the municipal solid-wastes, collection, dumping and evaluate the efficiency and reliability of Municipal solid-waste management system. A total of 200 households were randomly sampled and interviewed. Data was analysed using Binary-Logistic Regression model to determine factors influencing collection and dumping of solid wastes. Results showed that biodegradable/organic wastes comprise a major fraction of solid-wastes produced. Factors that influenced solid-waste collection and dumping included: household-age, unavailability of solid-waste containers, inadequate collection/dumping space and weak legal-enforcement against poor-dumping. The waste system is constrained by inadequate transport facilities, inadequate space for temporal dumping; and lack of legal enforcement in matters of solid-waste poor handling. These have made the systems ineffective and unreliable. This study recommends involvement of all stakeholders in innovative approaches to uphold sustainable municipal sanity.

This study aimed at establishing the potential of fruit trees in carbon sequestration. The specific objectives were to establish the carbon stocks in fruit trees compare the potential of carbon stocks in citrus and mango trees and examine the relationship between the management practices and carbon stocks in fruit trees. At the farm level, plots were identified and transects established and individual fruit trees from sampled individual farms along the transect were selected. At the tree level, measurements of tree height and diameter at breast height were made. They were converted to biomass using allometric equations. Analysis of Variance was used to compare the differences in carbon stocks between the fruit trees and between the different management practices. Findings revealed higher biomass and carbon stocks in mango trees as compared to citrus (74.57 ± 14.95 and 13.52 ± 1.25 t/ha respectively). Significant differences are also reported in carbon stocks under different management practices (p < 0.05). Irrespective of the species type, above-ground carbon under different management practices followed the order (from highest to lowest): Inorganic fertilizer < Intercrop < Monocrop < organic fertilizer and irrigation < intercrop and inorganic fertilizer. The results also point out that mango fruits have a high potential to sequestrate carbon emissions hence mitigating global warming.

Citropsis articulata (Spreng.) is a potent medicinal plant that is increasingly threatened by unsustainable harvesting and habitat destruction due to deforestation. This calls for enhancement of ex-situ conservation of C. articulata through offsite production. However, the success of offsite production of this species heavily rests on precisely assessing the suitability of the land for its production. In this study, an integrated GIS based multi-criteria evaluation approach was used to depict suitable areas for production of C. articulata based on key factors of; climate, soil and topography. Results revealed that only 13.04% (31495.77 km2) of Uganda’s land is very suitable to support natural production of C. articulata and is mainly situated in the western and central regions. Findings further revealed that 76.4% (24062.77 km2) of very suitable land area is situated outside protected areas, thus implying availability of potential sites for ex-situ and commercial production of C. articulata in the country. Findings also indicated that C. articulata has potential of thriving in well drained, moderately acidic soils and pleasantly warm regions endowed with moderately high precipitation and humidity. Since current stocks of C. articulata are mainly restricted to protected areas, cultivating this species will provide alternative sources of the plant harvest. This will help to relieve current pressures on the wild populations of C. articulata, thus providing a safety backup to the current in-situ conservation efforts.

Citropsis articulata is a medicinal plant that is increasingly threatened by unsustainable methods of harvesting and habitat degradation. Owing to the fact that this plant species is highly utilized for herbal medicine and is currently restricted to a few forest reserves in Uganda, this has significant implications for ex situ conservation. Therefore, the aim of this study was to assess how physiographical factors influence the occurrence and distribution of C. articulata in the three forest reserves in Uganda, namely, Budongo, Mabira, and Kibale National Park. The study was carried out in 15 compartmental sites in each of the three forests. In each compartmental site, 4 plots of 60 m × 60 m were systematically established, and within each plot, 4 subplots each of size 20 m × 20 m were randomly setup. A total of 240 subplots were assessed for occurrence of Citropsis articulata in each forest. The results indicated a significant (p<0.05) variation in the density of C. articulata with the highest recorded in Kibale National Park. Citropsis articulata generally occurred at moderate altitudinal landscapes (overall elevation = 1200.0 ± 20.73 m) with soils that are moderately acidic (overall pH = 5.7 ± 0.10), low in salinity (overall salinity = 84.0 ± 3.84 mg/l), and moderate levels of macro- and micronutrients. Citropsis articulata was generally associated with plant communities dominated by canopy tree species of genera such as Chryosphyllum, Celtis, Markhamia, Cynometra, Lasiodiscus, Trilepisium, Funtumia, and Diospyros, thus suggesting that C. articulata is a shade-tolerant species. Establishing the ecological requirements of this plant species among other things informs the potential for ex situ production of this plant. This will not only provide alternative sources of plant harvest but also go a long way in relieving the current harvest pressures exerted on the conserved wild populations of this plant species.

Access to integrated disaster-related data through querying is still a problem due to associated semantic barriers. The disaster domain largely relies on the top–down approach of ontology development. This limits reuse due to associated commitments and complex alignments within ontologies. Therefore, there is a need to utilize a bottom-up approach that reuses patterns for representing disaster knowledge. To bridge the availability gap of patterns for representing disaster knowledge, this study identifies existing and emerging patterns for reuse while organizing disaster data from multiple sector stakeholders. Based on the eXtreme Design (XD) methodology and key informant interviews, competency questions (CQs) were elicited from domain stakeholders. The CQs are matched with existing patterns from other contexts. Emerging patterns (e.g the Event Classification and Quality Dependence Description for Objects) are also developed for CQs not captured and subsequently tested using SPARQL queries characterising the CQs. It is in this context that this paper presents a characterisation of disaster risk knowledge using CQs and corresponding patterns (reusable and emerging) covering the knowledge. Accordingly, we illustrate a pattern-driven use case to organise drought hazard data for early warning purposes. This provides a powerful use case for adopting a pattern-based approach to knowledge representation in the disaster domain.

Over 70% of Uganda is infested by the tsetse fly, which has negative effects on human and livestock health. From colonial to post-independent Uganda, the Government of Uganda has worked to eradicate the tsetse menace. Despite these efforts, recent veterinary reports from the Karamoja sub-region have indicated widespread tsetse invasion. This study investigated the potential impact of tsetse invasion on the socioecological resilience of pastoral communities in the Karamoja sub-region. Results indicated that tsetse invasion is spreading from north to south of Karamoja. The tsetse transmission route emerging from southern Karamoja is perceived to be a continuation of the tsetse belt from West Pokot, Kenya. Cases of livestock deaths, livestock abortions, decreased milk yields, restricted access to prime grazing lands, heightened human-wildlife conflicts and disruption on crop cultivation have been reported. A computed socioecological resilience index in the study area was positive but low. Owing to the transboundary characteristics of tsetse invasions and sources and the associated documented effects, an urgent, strategic and system-wide intervention should be undertaken to control the tsetse invasion in this sub-region.

Agroforestry adoption as a drought adaptation option has an omnibus of opportunities for smallholder farmers in semi-arid regions. This study assessed the severity and frequency of drought and the determinants of agroforestry adoption in Nakasongola District. The episodes were examined using the Standardised Precipitation Index (SPI) set at 3, 6 and 12 months timescales. A cross-sectional survey using semi-structured questionnaires, focus group discussions and key informants were adopted. A total of 200 farmers were randomly selected and studied. The adoption was determined using a binary logistic regression. The SPI results showed that the extreme drought years recorded were 1980, 1984, 1986, 1990, 1995, 1999 and 2000; while the wettest years were 2014, 2012, 2013, 2009 and 2010 as per the 3-time scales. The average return period of severe droughts was 4 years. The levels of agroforestry uptake were higher (85%) between July and June drought period. Agrisilviculture, agrosilvopastoral, silvopastoral and apiculture were the most adopted agroforestry systems by the farmers. The household age, level of education and income were the major significant determinants of agroforestry adoption (p

Farmer Field Schools (FFS) can empower farmers through meetings at demonstration sites to promote agricultural production because of discovery learning. This study empirically investigated the FFS’s diffusion of knowledge and its impact on the smallholder farmer’s adaptation to climate change in Kiboga district characterised by low rainfall pattern. A cross-sectional research design was adopted where a total of 120 FFS-members and 60 non-FFS-members were randomly selected and interview using a validated household survey questionnaire. Data was analysed through descriptive statistics and Chi-test (i£2) to the relationship between the FFS and the member’s adaptation to climate change. The findings revealed that drought, hailstorms, changes in onset and cessation of seasons were the main seasonal manifestations of climate change experienced in the district. The FFS majorly diffused adaptation knowledge and skills through establishment of comparative studies (28%); establishment of commercial enterprises (21%) and training of the members (18%); distribution of inputs to the FFS (10), examination of performances of distributed inputs (8%), FFS exchange-visits (6%), graduation of FFS members (4%), field days (3%) and integration of village savings into FFS (2%) throughout the seasonal calendar.The FFS-members aggressively adapted to the manifestations of climate change through the application of micro-irrigation, early planting, mulching, seed multiplication, the sale of livestock, construction of barns and planting of drought-tolerant crop and pasture varieties during the eventualities on their farmlands. The FFS significantly contributed to the adaptation to climate change (drought and shifts in seasons) by the smallholder farmers (p

Long-term trend analysis at local scale for rainfall and temperature is critical for detecting climate change patterns. This study analysed historical (1980&ndash, 2009), near future (2010&ndash, 2039), mid- (1940&ndash, 2069) and end-century (2070&ndash, 2099) rainfall and temperature over Karamoja sub-region. The Modern Era-Retrospective Analysis for Research and Applications (MERRA) daily climate data provided by the Agricultural Model Inter-comparison and Improvement Project (AgMIP) was used. The AgMIP delta method analysis protocol was used for an ensemble of 20 models under two representative concentration pathways (RCPs 4.5 and 8.5). Historical mean rainfall was 920.1 &plusmn, 118.9 mm and minimum, maximum and mean temperature were 16.8 &plusmn, 0.5 &deg, C, 30.6 &plusmn, 0.4 &deg, C and 32.0 &plusmn, 0.7 &deg, C, respectively. Minimum temperature over the historical period significantly rose between 2000 and 2008. Near future rainfall varied by scenario with 1012.9 &plusmn, 146.3 mm and 997.5 &plusmn, 144.7 mm for RCP4.5 and RCP8.5 respectively, with a sharp rise predicted in 2017. In the mid-century, mean annual rainfall will be 1084.7 &plusmn, 137.4 mm and 1205.5 &plusmn, 164.9 mm under RCP4.5 and RCP8.5 respectively. The districts of Kaabong and Kotido are projected to experience low rainfall total under RCP4.5 (mid-century) and RCP8.5 (end-century). The minimum temperature is projected to increase by 1.8 &deg, C (RCP4.5) and 2.1 &deg, C (RCP8.5) in mid-century, and by 2.2 &deg, C (RCP4.5) and 4.0 &deg, C (RCP8.5) in end-century.

In the tropics, unmonitored land use/cover types cause significant effects on the narrowing and widening of river channels which affects the integrity of water resources. River channel planform extent was characterized using Landsat images, while water and bedload samples were collected and analysed for a period of one year. The results revealed that in 1986, the channel planform covered 3.7 sq km in length than in 2013 where it increased to 4.2 sq km. Wetland (537.1mgl−1) and bushland (186.3mgl−1) cover types had the highest concentration of suspended sediments. Fine sand (0.25 mm), silty sand (1 mm) and silty clay (0.125 mm) bedload particle types dominated the riverbed along the channel from the sampled land use/cover types. The high concentration of sediments, bedload materials, bank instability, and streamflow were significant contributors to the narrowing and widening of the channel (p

Many smallholder farmers in semi-arid areas continue to face increasing threats of agricultural drought exacerbated by a rapidly changing climate. This calls for increased understanding of farmers' drought response experiences and perceptions for better agricultural production. This study assessed the smallholder farmers’ perceived evaluation of drought adaptation technologies, constraints and opportunities in drought prone districts of Uganda. A cross-sectional survey was conducted using semi-structured questionnaires. The evaluation indicators of the technologies included efficiency, effectiveness, equity, acceptability, urgency and institutional compatibility performance measures. The findings show that among the irrigation technologies, drip irrigation systems were the most efficient, effective, acceptable and urgent performance measures (p

This paper analyses Uganda’s rangeland policies and their ecological and socio-economic consequences, beginning in pre-colonial times. The paper interrogates what informed these policies, their objectives and outcomes that have been realized. Policy actions are recommended to correct the deficiencies identified in the analysis. This analysis shows that policies were based on western European resource management, classical rangeland ecological and economic theory and marginalization narratives, rather than the socio-ecological realities of Uganda’s rangelands. The unique attributes of Uganda’s rangelands were largely unrecognized. Consequently, pastoralists, dependent on the rangeland resources and ecosystem services, were displaced and exposed to incremental risks, poverty and a breakdown of social networks and safety nets as well as decline in rangeland productivity. In the rangelands of north-eastern Uganda for example, the inflexibility and immobility and forms of exploitation dictated to the Karimojong pastoralists led to increased soil erosion and decline in land productivity. Similarly, with increased parcelization, individualization and sedentarization in central and south-western Uganda, pastoral communities became impoverished as rangeland resources became increasingly limited. This increased their exposure to the vagaries of extreme events such as droughts, floods and disease outbreaks, thereby increasing livestock mortality and recurrent food insecurity. Expansion of competing land uses has reduced the net availability of rangeland resources, often with the support of external incentives. Current policies promoting fire exclusion have led to increased bush encroachment, while other policies have undermined the centrality of commons’ governance practices and institutions. Uganda’s land use policies ought to emphasize a more balanced socio-ecological perspective (ensuring net gain especially in the interaction of resource use between humans and the environment) that supports the functionality and productivity of rangeland ecosystems and their ability to deliver socio-economically important ecosystem services and address human needs. This can be through promotion of common property and consolidation of land for optimal utilization of ecological heterogeneity and enhancement of resilience. Mapping of transhumance corridors to determine ways through which mobility can increase herds’ access to forage and water between and within years will be equally important to enhance pastoralists’ resilience. Policy actions that provide payments for conservation stewardship of rangelands should be considered to incentivize land owners to maintain their land as rangelands. Assessment is required of the ecological and social impacts of fire, in order to determine optimal fire regimes and amendment of laws that ban the use of fires, so as to promote prescribed burning in rangelands. Achieving all these will require reforms that clearly delineate policy and legal frameworks for sustainable rangeland use and management.

Uganda’s agricultural environment is characterized by smallholder farmers. Majority of these are found in rural areas and food insecure. This study specifically explored to understand and put across the determinants of local and regional distribution of key crops grown and livestock reared; constraints and opportunities along the agricultural value chain; and institutional and stakeholder involvement in setting policy agenda. This information was born through review of published and grey literature. The findings of this comprehensive review broadly reveal that the major key crops grown in Uganda today are: coffee, bananas, maize, beans, cassava and rice; while in terms of animals and birds: cattle, goats, pigs and local chicken are the most kept by farmers respectively for food security. In terms of local and regional variations, coffee and banana are highly productive in the eastern and western highlands while the remaining crops flourish in the flat plains and valleys (wetlands). The dryland belt ‘cattle corridor’ that stretches from north-eastern to south-west Uganda has the highest numbers of livestock reared. Considering both the livestock and crop value chains, constraints which are also the determinants of opportunities, can be categorized along four dimensions, namely: a) production and productivity constraints, b) market access and value addition constraints; c) enabling environment constraints and d) Institutional Framework constraints. Since 2000, informed by the Poverty Eradication Action Plan the agriculture policy frameworks have been formulated against the backdrop of the Plan for Modernisation of Agriculture (PMA) as a multisectoral policy framework for agriculture, food security and rural development. Before the formulation of PMA, agricultural interventions were scattered and there was no comprehensive policy framework to guide the sector. Currently, the PMA – thus subsequent policies, programs and plans, have not yet recognised a holistic approach in modernizing agriculture, as well as the interconnection among the various sectoral stakeholders. However, harmonisation and implementation of these policies and associated programmes and plans should provide leverage for enhanced productivity and reduced food insecurity. This study provides synergies between agriculture and food security to guide future policy formulations, enactment of pending bills and allocation of funds. Potential areas of investment in smallholder agriculture are presented and how to transform the sub sector into a profitable venture.

Land use and cover changes influence the livelihood and degradation of fragile ecosystems. The extents of these changes in pattern were investigated in Lake Bunyonyi Catchment which lies in the South Western Highlands of Uganda. The dynamics and magnitude of land use and cover changes were assessed using Landsat (TM/ETM+) satellite images and collection of socio-economic data through interviews. The images were processed and analysed using the mean-shift image segmentation algorithm to cluster and quantify the land use and cover features. The study noted that in the assessment period 1987-2014, the small-scale farmlands, open water and grasslands remained quasi constant; while the woodlots followed a quadratic trend, with the lowest acreage experienced in 2000. The tropical high forests and wetlands cover types experienced significant decline over the years (P

Semi-arid areas show climatic variability on a spatio-temporal scale. There are few studies on the long-term trends and intensity of this variability from East Africa. We used National Ocean and Atmospheric Administration re-analysis climate data (1979–2009) in this study. Rainfall exhibited a non-significant long-term trend. The climate of the area is variable (coefficient of variation-CV >35.0%) with spatio-temporal oddities in rainfall and temperature. A rise in minimum (0.9 °C), maximum (1.6 °C) and mean (1.3 °C) temperature occurred between 1979 and 2009. There were more months with climate variability indices below the threshold ( 2.6) were experienced between 2004 and 2009 than between 1984 and 2003. We consider that the use of spatio-temporal climatic informati...

Food insecurity is a region–wide problem in Sub-Saharan Africa, exacerbated by severe drought, with devastating impacts at the household level. However, farmers' coping strategies and their determinants remain under–documented. In this study, we: 1) characterise relationships between perceptions of drought and food insecurity and corresponding household coping responses, 2) compare livelihood characteristics of farmers that perceived food insecurity as a problem and those who did not, and 3) investigate how household-level characteristics correspond to household coping strategies. Our study is exploratory in nature: we administered a questionnaire to 140 farmers in Isingiro district in South-west (SW) Uganda whose livelihood is predominantly dependent on crop production. We employ binomial and multinomial logistic regression models to identify the determinants of the respondents’ perceptions, how household characteristics correspond to household perceptions of food insecurity, and factors that affect coping responses. Our data show that 68.6% of the respondents perceived food insecurity as a problem in their household. Access to credit for crop cultivation increased the likelihood (p

Artisanal gold mining activities continue to degrade water resources in the tropical watersheds. In this study, we examined the spatial distribution of artisanal gold mining activities and their impact on sediment and mercury concentration in the Okame River catchment, Eastern Uganda. The spatial distributions of mining activities were assessed using both a TerraSAR-X radar satellite image of 2008 and Landsat image of 2013. Water samples and river bed deposits were collected on a monthly basis for a period of 1 year to assess the impact of mining activities on the streamflow variations and sediment concentration. Our results showed that the distribution of gold mining activities increased from 4.5 km2 in 2008 to 19.9 km2 in 2013. Human-induced sediment loading due to gold stone washing in the sampled tributaries of Okame River was responsible for the high concentration of suspended sediments (CSS), mercury and low water levels than prior to gold stone washing. River Omanyi (0.0191 mg l−1) was the most highly contaminated stream with mercury followed by Nankuke River (0.0163 mg l−1) and Nabewo River (0.0158 mg 1−1) in the Okame. There was also a significant concentration and trend of soluble mercury contamination from the sampled rivers (R 2 = 0.8). The average concentration of mercury was found to be 0.004 ± 0.0009 mg l. This paper notes that artisanal mining activities have led to the reduction in streamflow rates, change of streamflow course and colonization of stream banks by riparian vegetation.

The multiplicity of land-use/cover changes in reducing the areas covered by vegetation is of growing concern in Uganda today. Consequently, the study intended to determine the magnitude and transition potential of land-use/cover changes in a trans-boundary river Sio catchment. The magnitude of land-use/cover changes was determined by an application of unsupervised image classification on the ortho-rectified Landsat TM/ETM images of 1986 and 2000 using ILWIS 3.3 software; whereas an ArcGIS 9.2-based Land Change Modeler was used for both change analysis and transition potential modeling. The results showed that in the period of 1986 to 2000, wetlands and bushlands largely reduced by 21% and 5%, respectively, whereas small-scale farming and grasslands increased by 14% and 12%, respectively. The multilayer perceptron attained an accuracy of 97.03%, which is a higher percentage for the possible occurrences of land-use/cover changes in Sio catchment. The major drivers of land-use/cover changes are land ownershi...

Understanding the context and importance of ecosystem-based adaptation (EbA) by agro-pastoralists is important for building climate resilient social and ecological systems amidst the changing climate. A cross-sectional survey was conducted to examine the EbA to drought by the smallholder farmers in Nakasongola District where a total of 100 respondents were randomly selected and subjected to interviews. To supplement on this information, a land use/cover spatial dataset of 2016 for Uganda was obtained and analysed to characterise and quantify the distribution of ecosystems utilised by the agro-pastoralists in the District. The spatial results revealed that the grassland (1524.6sq.km) and agricultural (agroecosystem) (779.1sq.km) ecosystems were the largest ecosystems followed by the forest/woodland and freshwater ecosystems in terms of coverage. The farmers perceived severe droughts to occur between December to January for the last 30 years with an average of 4 years return period. The agro and grassland ecosystems were the main contributors of drought adaptation opportunities compared to the freshwater and forest/woodland ecosystems. The direct and indirect opportunities involved goods and services such as water provision, mulching materials, food provision, fuelwood, regulation of air quality and water flow. However, the major constraints to EbA included rampant deforestation, limited knowledge on ecosystem conservation and overgrazing. Thus increasing water supplies for domestic and agricultural production is more likely increase the farmer’s adaptation to drought.

We investigated the impact of land use change on carbon stocks and its implications to climate variability in Mountain environments. Remotely sensed biophysical data was used to determine the extent of land use change over the last two decades. Land uses were stratified thus; forest under restoration, woodlots/plantations, agricultural land, regenerating forest and intact forest. Carbon in above and below ground biomass was measured using the allometric equations, whilst soil samples were analyzed for total carbon by the dry combustion method. The differences in carbon stocks in various land uses were analyzed using Analysis of variance (ANOVA). Top soil layers (0-10cm) were found to store more carbon than the deeper ones. Furthermore, intact forest stored more soil organic carbon (> 45t/ha) compared to other land uses with the least in land under agriculture (about 1.5 t/ha). The decimation of land uses with high carbon stocks was noted to reduce the potential of Mt. Elgon as a carbon sink. This therefore calls for the scaling out and up of forest restoration programmes in and around mountain environments, whose success will depend on the active participation of all stakeholders including, Uganda Wildlife Authority (UWA), local communities, politicians and leaders.

With increasing population, coupled with land shortage and weather variations, wetlands in Uganda have continued to face degradation due to mainly conversion for agricultural, industrial and settlement purposes. The objective of this study was to determine the spatial and temporal wetland use/cover changes and local perceptions attributed to these changes. The study utilized three sets of ortho-rectified and cloud free Landsat TM/ETM+/MSS temporal images (30 m) of 1986, 2000 and 2011. The classification procedures were carried out using an Integrated Land and Water Information System (ILWIS) software version 3.7. A wetland classification system for Uganda developed by the National Biomass Study, 2003 was adopted to describe the wetland use/cover types. The classified images were validated in a ground truthing exercise using Global Positioning System (GPS) to improve on the classification accuracy. Key informant interviews and focus group discussions were conducted with communities adjacent to the wetlands in each of three of the ten Ugandan agro-ecological zones to determine the underlying drivers of wetland use/cover changes, while household interviews generated information on local perceptions of the changes. Significant changes were mainly observed in wetland use/cover between 1986 and 2011. Major factors responsible for these changes were subsistence farming due to intensification of growing paddy rice in Kyoga plains, an influx of migrants who accessed wetlands for daily subsistence (livestock grazing) in South western farmlands and proximity to urban centres in the Lake Victoria Crescent. In all the sampled agro-ecological zones, increased crop farming in wetlands was due to changing opportunities created by existent large markets for wetland crops. Majority (60%) of the local people perceived wetlands in their proximity to have undergone high degradation within the last 10 years, and to have declined in quantity and quality of vegetation, soil fertility and water levels. There was a noticeable variation across the sampled agro-ecological zones, with the highest proportion of local communities perceiving degradation being in Kyoga plains (76%), followed by Lake Victoria crescent (63%) and South-western farmlands (41%). Locally perceived threats to wetlands were mainly from crop growing that accounted for 33% of the frequency of mentioned threats, collection of wetland resources (30%), and prolonged floods and droughts (12%). This study confirms the importance of economic opportunities from new market outlets and migration in its various forms as key factors in land use change, especially at timescales of a couple of decades.