Browsing by Author "Tenywa, M. M."

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    Dynamics of forest cover conversion in and around Bwindi impenetrable forest, Southwestern Uganda
    (Journal of Applied Sciences and Environmental Management, 2011) Twongyirwe, R; Majaliwa, J. G. M.; Ebanyat, P.; Tenywa, M. M.; Sheil, D.; Heist, M. V.; Oluka, M.; Kumar, L.
    Forest cover has been converted to agricultural land use in and around the protected areas of Uganda. The objectives of this study were; to examine the dynamics of forest cover change in and around Bwindi impenetrable forest between 1973 and 2010 and to identify the drivers of forest cover change. The trend in forest cover change was assessed by analyzing a series of orthorectified landsat imageries of 1973, 1987 and 2001 using unsupervised and supervised classification. Land use/cover map for 2010 was reconstructed by analyzing 2001 image, validated and/or reconstructed by ground truthing, use of secondary data and key informant interviews. A series of focused group discussions and key informant interviews were also used to identify drivers of land use/cover change. Policies and institutional arrangements that could have affected forest cover change for the studied time period were also identified. Results showed that protected forest and woodlot in unprotected area had declined by 7.8% and 70.7% respectively as small scale farming and tea plantations had increased by 13.9% and 78.3% respectively between 1973 and 2010. The conversions were attributed to land use pressure due to population growth, change in socio-economic conditions and institutional arrangements. The severe loss of woodlot outside the protected area not only poses a potential threat to the protected forest but also calls for intervention measures if efforts to mitigate climate change impacts are to be realized
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    Initial Efficiency of Commonly Used Practices to Control Soil, Runoff and Nutrient Losses from Maize and Banana Based Systems in the Lake Kivu Basin
    (Journal of Great Lakes Research, 2016) Adidja, M. W.; Majaliwa, J. G. M.; Tenywa, M. M.; Bashwira, S.; Adipala, E.
    This study was carried out to determine the initial efficiency of commonly used practices to control soil erosion from Maize and Banana based cropping systems in Lwiro micro catchment in the Lake Kivu basin. Soil, runoff and nutrient losses were determined using runoff plot approach. Instrumentalised runoff plots of 2X15m were installed on maize intercropped with beans and banana gardens. Two soil erosion management practices, namely; Tithonia and contour bunds were tested on Maize intercrop with Beans and mulch for Banana. The experiment included a control practice for each crop. Each treatment and control was replicated four times. Runoff and soil loss were estimated for each rainfall event and aggregated on seasonal basis. Nutrient (N, P and K) losses were estimated per season. Results of the long and short rains of the first year of experimentation show that soil and runoff losses did not significantly change with practices and seasons (P>0.05) for both banana and maize based systems. Soil and runoff losses ranged from 15.73 to 32.93 Mg/ha, and from 168.14 to 322.17 m3; respectively. Nutrient losses varied with practices and seasons (P<0.05) and ranged from 54.68 to 112.34 Kg/ha, 87.7 to 409.4 Kg/ha; 24.5 to 94.22 Kg/ha for K, N and P; respectively. Soil and runoff losses ranged from 8.99 to 20.6 t/ha, and from 85 to 152 m3; respectively. Only K losses changed significantly with season (P<0.05) and ranged from 17.8 to 53.9 Kg/ha under Banana cropping system.