Browsing by Author "Mwambusi, J.N"
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Item Effects of different pre-sowing treatments on germination of pericopsis angolensis seeds of Tabora miombo woodlands, Tanzania(Tanzania Journal of Forestry and Nature Conservation, 2023) Mbailwa, Y.S; Chamshama, S.A.O; Mwendwa, B.A; Mwambusi, J.NPericopsis angolensis species survival is reported to be low in nurseries. Given the high dormancy tendency of Legume family, it is speculated that, pre-sowing treatment of Perocopsis angolensis seeds may result in improved germinability. Different attempts of breaking the dormancy to enhance germination have been done. However, the difference in environmental conditions - soil pH, temperature, and water availability - which parental plants experienced during their growth and seed maturation, have an impact on seed germination patterns. This study assessed the effects of pretreatments (soaking in cold and boiling water at different time intervals) on the germination of Pericopsis angolensis seeds collected in Tabora, Tanzania. Analysis of Variance (ANOVA) was done to show differences in seed germination parameters under different pretreatments. Results show that, there was significant (P<0.001) difference in germination parameters between the control and pretreated seeds except for the Mean Germination Time (P>0.05). The highest Germination Value, Germination Percent and Germination Capacity were found under control. The findings prove that pretreating Pericopsis angolensis seeds by soaking in cold and hot water have no additional effect on germination. Thus, the study suggests that the restoration of the forests using Pericopsis angolensis species can be achieved even without seed pretreatments.Item Effects of thinning regimes on growth and yield of tectona grandis at Longuza forest plantation, Muheza district, Tanzania(Tanzania Journal of Forestry and Nature Conservation, 2022) Mgoo, O.S; Mwambusi, J.N; Chamashama, S.A.OThinning regime implies stands thinned at successive intervals, type, and intensity influencing growth and yield. Teak Forests in Tanzania are the main source of hardwood raw materials however thinning operations are not properly implemented. The purpose of this study was to determine whether thinned stands could impair the eventual projected growth and yield. Growth and yield data were collected from 168 purposively selected circular plots of radius 9.78 m distributed systematically in 9 thinned compartments in three thinning regimes. Thinning history, tree diameter, and total height of three fattest trees were recorded. Simple t-test was used to compare whether thinned stands were significantly different from Teak yield table values in Dbh, volume, and stocking. Results show that 88.9% and 11.1% of thinned compartments were understocked and well stocked respectively based on the Teak yield table. Also, 100% and 75% of first and second thinnings respectively were well timed whereas 25% of second thinning was delayed. Among surveyed compartments, 66.7% and 33.3% belong to site classes I and II respectively. Effects of adequate and timely thinning on Dbh and volume were 2- 42% and 9-53% respectively. Thinning and timing promoted positively Dbh and Volume growth. Adequate and timely thinning treatments are recommended.Item The silviculture of woodlots of smallholder forest producers in Mufindi District, Tanzania: knowledge and treatments(Tanzania Journal of Forestry and Nature Conservation, 2021) Mwambusi, J.N; Kapp, G; Chamshama, S.A.OSmallholder forestry is experiencing many challenges like limited understanding of silvicultural treatments to impact the quality and performance of woodlots. This study determined the silvicultural treatments of smallholders in Mufindi district by interviewing 78 respondents then assessing the silviculture of 78 woodlots in 13 sampled villages. The study found out that more than 80% of smallholders had a certain level of understanding of some treatments like weeding and pruning. A major source of knowledge was personal experiences from fellow farmers and Sao Hill Forest Plantation. Based on market demand, P. patula and E. grandis were the most planted species in the woodlots. Smallholders reported planting trees at a spacing of 3 x 3 m without clear knowledge on factors to consider for initial spacing. Also, reported harvesting trees for sawn timber at 8 - 13 years and transmission poles at 6 - 8 years. Contrary to knowledge, the assessment found out that majority of woodlots had a spacing of 2.5 x 2.5 m. Many woodlots were poorly pruned and surrounded by shrubs which affected timber quality. Generally, woodlots management was unsatisfactory due to insufficient technical knowledge. Thus, more training is needed to strengthen smallholder forestry to ensure sustainable tree farming.