Effect of thinning on selected stand parameters and revenue generation of tectona grandis at longuza plantation, Muheza,Tanzania
| dc.contributor.author | Mgoo, Omari Shaban | |
| dc.date.accessioned | 2026-01-22T17:09:25Z | |
| dc.date.available | 2026-01-22T17:09:25Z | |
| dc.date.issued | 2024 | |
| dc.description.abstract | Various researches have reported the effect of thinning on stand parameters of Tectona grandis in Tanzania. However, there is limited information on the effect of thinning on growth and yield, and revenue generation of Tectona grandis in Tanzania. This study assessed the effect of thinning on growth and yield and revenue generation of Tectona grandis at Longuza Forest Plantation. Data were purposely collected from 168 circular plots of 9.78 m radius (0.03 ha) distributed systematically in 9 thinned compartments. In each plot, all trees were measured for diameter at breast height (Dbh) and total height of three trees with largest, medium and smallest heights were measured. Compartment register provided information on planting and thinning year. Prices of wood volume at clear-felling, poles and expenses on establishment and management costs of the surveyed stands were collected. Growth and yield parameters described were Dbh, dominant height, volume per ha, and stand density. Adequacy of thinning was determined by calculating the remaining number of stems per hectare (ha) and the deviation from scheduled values expressed in percentages. Thinning timing was obtained by deducting the age the compartment was supposed to be thinned as indicated in the thinning schedule. An economic benefit was calculated by using discounting method whereas net present value (NPV) was used to determine the economic point of view. Thinning effect was assessed by comparing measured values with mean values of Teak yield table. One sampled t-test was used to compare if there were a significant difference between measured and Teak yield table values. The results have clearly showed that 88.9% of thinned compartments were understocked and 11.1% were well stocked. Furthermore, 100% and 75% of the first and second thinning were well-timed, whereas 25% of the second thinning was delayed by one year. Site classes I and II comprised 66.7% and 33.3% of the surveyed compartments. The effects of adequate and timely thinning on Dbh and volume were 2-42% and 9-53%, respectively. Heavy thinning in the first and second thinning schedule maximized economic benefit of climatic and ecosystem services provisioning goal by 181.5%. However, early heavy first and second-intensity thinning was found to be one of the essential treatments in producing higher financial returns but delayed thinning reduced the volume of logs produced with low quality and thus graded lowly. Heavy, timely and adequately thinnings are recommended. The results determines that Tectona grandis plantations play a crucial role in providing quality timber and storing carbon dioxide (carbon sink) from the atmosphere. | |
| dc.description.sponsorship | Tanzania Forest Services Agency (TFS) for granting me sponsorship | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/20.500.14820/7253 | |
| dc.language.iso | en | |
| dc.publisher | Sokoine University of Agriculture | |
| dc.subject | Thinning | |
| dc.subject | Climatic and Ecosystem provision | |
| dc.subject | Revenue generation | |
| dc.subject | Tectona grandis | |
| dc.subject | Longuza | |
| dc.title | Effect of thinning on selected stand parameters and revenue generation of tectona grandis at longuza plantation, Muheza,Tanzania | |
| dc.type | Thesis |