Browsing by Author "Laswai, F.F"

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Optimal rotation age of pinus patula in government forest plantations in Tanzania
(Tanzania Journal of Forestry and Nature Conservation, 2021) Mugasha, W.A; Laswai, F.F; Malimbwi, R.E; Chamshama, S.A.O.; Abdallah, J.M; Mauya, E.W
A study to determine the optimal rotation age of Pinus patula was conducted in five forest plantations in Tanzania, i.e., Kawetire, Kiwira, North Kilimanjaro, West Kilimanjaro and Meru. Growth and yield, and mechanical properties data were collected from compartments representing age from 5 to 25 years. In addition, revenues and management costs data were collected for the purpose of determining the economic rotation age. For the purpose of determining the optimal rotation age based on growth and yield, the following basic models were developed: 1) site index curves model, 2) height-D model, 3) Single tree volume model, 4) Basal area growth model 5) stand volume model, 6) mortality model, and 7) simulation of thinning. Analysis of Variance (ANOVA) was carried out to ascertain whether the wood properties vary across age classes. Economic analysis of rotation age data involved computation of Net Present Value (NPV). Growth and yield data revealed irrespective of site class, P. patula can be harvested at age of 18 years while mechanical wood properties show that harvesting ages range between 16 and 21 years. Based on NPV, the optimal age was 16 years. Therefore, it is recommended P. patula be harvested at age of 18 years irrespective of site class.
Tafori experience in solving forest deforestation and degradation challenges in Tanzania
(Tanzania Forestry Research Institute (TAFORI) and Tanzania Forest Fund (TaFF), 2018) Maduka, M.S; Laswai, F.F; Njongomi, E.E
Deforestation and forest degradation in Tanzania are the challenges noting deforestation rate of about 500,000 ha per year. Tanzania Forestry Research Institute (TAFORI) has gained vast experiences in solving deforestation and forest degradation. Experiences gained are from enhancing natural regeneration of degraded forests and woodlands, introduction and screening andmultiplication of Eucalyptus hybrid clones, artificial propagation of indigenous trees (medicinal, timber and fruit trees), including application of tissue culture technology, enhancing availability of planting materials through the establishment of seed orchards and gene conservation stands. In meeting charcoal demands and sustainable utilization of available trees resources, efficient charcoal-making kiln (Casamance) has been introduced and disseminated through outreach programme. Regeneration techniques for 10 dominant tree species in Miombo woodlands of Tabora and three tree species within the Eastern Arc Mountains have been developed. Over 500,000 ha of Ngitilis and 20 tree species have been restored in Mwanza and Shinyanga regions. Through Tree Biotechnology Programme, improved Eucalyptus hybrid clones have been introduced and adopted by stakeholders. Morever, the new focus towards application of tissue culture technology will widen the range of benefits including mass seedlings production. Several publications on research findings and dissemination materials in user-friendly languages have been made and distributed to stakeholders. More studies, identification of new technologies and innovations are required to meet the growing demands of wood.