LAKE DULUTI CATCHMENT FOREST RESERVE:
1. LOCATION: 3°23'S 36°47'E
12 Km from Arusha. Access is from Tengeru. The reserve covers
the inner slopes of a small crater around Lake Duluti on the southern foothills
of
Mt. Meru, west of Tengeru settlement, at an altitude of
1260m.
2.CLIMATE:
Oceanic rainfall with continental temperatures. Estimated
rainfall: 1100mm/ year with ground- water. Dry season: Jun - Oct. Estimated
temperatures 21°C max ( mar) 17°C min ( Jul).
3. VEGETATION:
Vegetation type is largely determined by the presence of
groundwater. The main forest type is submontane forest which occurs where ground
water is available aground the lake about 5 - 10 m above the lake
water table and 20 - 50m from the lake shore. Dry montane forest occurs on
the
upper slopes where ground water is not available. Near the North
shore of the lake is floating island of papyrus ( Cyprus papyrus).
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3.1 Submontane forest over groundwater:
Canopy 12 - 25 m tall with emergent Newtonia to
30 - 40 m. Larger trees include: Albizia schimperiana, Cordia sp, Cussonia sp,
Newtonia,
Olea capensis, Rauvolfia caffra, Sorindeaia
madagascariensis and Tchilia emetica. On the northen shore there is a large
clump of Raphia palm.
The shore line is overhung by the large fig trees Ficus
sycomorus and Ficus vallis - choudae.
Smaller trees include: bridelia micrantha,
Chaetacne aristata, Croton megalacarpus, Drypetes gerrardii, Tabenaemontana
stapfian and Vanguera
madagascariensis. Shrubs include Allophylus
africana. Psychotria lauracea, solanum seaforthianium, Pavetta oliveriana. The
ground layer is formed
by Afromonum sp and Nephrolepis sp.
3.2 Dry montane forest:
This forest type represents the climax vegetation
in areas without groundwater. It is dense and shady, with nettle trees ( Obetia
radula).
3.3 Open woodland:
Derived from dry montane forest following burning
and grazing. Trees include: Azanza garckeana, Combretum molle, and Ozoroa
insignis subsp.
reticulata.
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4. CATCHMENT VALUES:
The inner forested crater slopes are the Catchment for Lake
Duluti; probably supplemented by underground flow from Mt. Meru. The
reserve
supplies water to Tengeru settlement, the Agricultural
Training institute and the surrounding coffee farms from a water plant
established on the
eastern lake edge. Although coming form a volcanic
crater, the water is not saline indicating that its source is rainwater.
5. BIODIVERSITY:
The vegetation is largely composed of widespread species,
Though Chaetacme aristata is rare and an interesting dioecious tree with
sexual
dimorphism.
6. AMENITY:
Lake Duluti forest Reserve has a high recreational value. A
camping site on the eastern edge is already developed. There is a good footpath
around the lake. The lake surface reflects the peaks of Mt. Meru and
is near to the Arusha - Moshi main road.
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