Rainfall, Interception and Evaporation West in the Mazumbai Forest Reserve, Usambara Mts., Tanzania and Their Importance in the Assessment of Land Potential

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Date
1979
Authors
Lill L.
Bjorn L.
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Abstract
Owing to favourable ,Oil and climatic conditions the naturally forested highlands of Tanzania have a comparatively high potential for agriculture Major limiting factors are drought damage and erosion The seventy of these depend on the interaction between land use practices. Soil/topography and climate As a result of rapid population increase land use practices are becoming more intentive. Resulting in detenorating soil structure. This in tum will lead to changed relations’ between climatic features on the one hand and crop and soil damage incidence on the other. The report IS based on analyses of rainfall, Interception and evaporation data in a forest and a small clearing In the Mazumba Forest Reserve in the Usambara Mts in NE Tanzania, obtained from measurements carried out 1971-1976, and of monthly rainfall data from the period 1945-1976 from the nearby Mazumbai Estate. The mean annual rainfall in Mazumbai is 1227 mm but the variability IS great Standard deviation from the mean (based on a record of 32 years) IS 324 mm and the rainfall like to be exceeded in 4 years out of 5 is 950 mm The highest annual rainfall recorded In the period IS 1864 mm and the lowest n I mm. April and May have high (180 and 250 mm) mean monthly rainfall. all other months have an average between 50 and 100 mm, but the variation from year to year is very high and any month, except April and May, may be completely dry Prolonged drought" I.e two or more consecutive months With less than 50 mm of rain are frequent In the 32-year period two very long such droughts have occurred (5 and 6 months), when only 30-35 'If of normal rainfall was received.
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Bulletin, 61, p. 157-178