Effect of Spacing Regimes on Growth, Yield, and Wood Properties of<i>Tectona grandis</i>at Longuza Forest Plantation, Tanzania

Zahabu, Eliakimu; Raphael, Tumaini; Chamshama, S.A.O.; Iddi, S.; Malimbwi, R. E.

doi:10.1155/2015/469760

Cited by 33 publications

(52 citation statements)

References 9 publications

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“…The initial growing space of trees will affect: plant growth rates and biomass accumulation (Forrester et al, 2010); trunk and crown shape (Nogueira et al, 2008); population production (Silva et al, 2016); thinning and stripping regimes, survival, and cutting age (Pelissari et al, 2014a); wood properties (Lima et al, 2009;Zahabu et al, 2015); and costs and operational efficiency in the implementation, maintenance, and harvesting of the crop (Silva et al, 2016), especially in species that remain in the field for longer periods until final harvest (rotation) and require periodic agroforestry interventions, such as T. grandis, Pesq. agropec.…”

Section: Introductionmentioning

confidence: 99%

Growth and yield of teak stands at different spacing

Medeiros

Paiva

D'Ávilla³

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to evaluate the growth and yield of teak (Tectona grandis) stands at different spacing and in different soil classes. Twelve spacing were evaluated in an Inceptisol and Oxisol, in plots with an area of 1,505 or 1,548 m2, arranged in a completely randomized design with nine replicates. The teak trees were measured at 26, 42, 50, and 78 months of age. Total tree height was less affected by spacing. Mean square diameter was greater in wider spacing, whereas basal area and total volume with bark were greater in closer spacing. An increase in volume with bark per tree was observed with the increase of useful area per plant. For teak trees, growth stagnation happens earlier, the growth rate is higher in closer spacing, and the plants grow more in the Inceptisol than in the Oxisol.

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Section: Introductionmentioning

confidence: 99%

Growth and yield of teak stands at different spacing

Medeiros

Paiva

D'Ávilla³

et al. 2018

Pesq. agropec. bras.

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“…Mean Annual Increment increased significantly with increasing spacing while spacing did not have significant effect on total volume production and basal area. Stand density is also not affected by spacing while heartwood proportion increases as planting spacing increases (Zahabu et al 2015).…”

Section: Mai = Vt Tmentioning

confidence: 99%

Assessing the feasibility of forest plantation of native species: A case study of Agathis dammara and Eusideroxylon zwageri in Balikpapan, East Kalimantan, Indonesia

et al. 2019

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Abstract. Setiawan B, Lahjie AM, Yusuf S, Ruslim Y. 2019. Assessing the feasibility of forest plantation of native species: A case study of Agathis dammara and Eusideroxylon zwageri in Balikpapan, East Kalimantan, Indonesia. Biodiversitas 20: 2453-2461. Plantation forest using native species is very important effort to support biodiversity conservation. Still, analysis on its feasibility is needed to guarantee the sustainable forest management. The research aims were to assess the feasibility of plantation forestry of Agathis dammara and Eusideroxylon zwageri based on production models and financial simulation of stands management. The production models were developed based on plantation forests in Balikpapan, East Kalimantan, Indonesia. Using these plantation we developed models to estimate tree volume, total volume per hectare, Mean Annual Volume Increment (MAI) and Current Annual Increment (CAI) for each species. Financial analyses were carried out to assess the Pay Back Period (PBP), Net Present Value (NPV), Net Benefit/Cost (B/C) Ratio, Internal Rate of Return (IRR) and Equivalent Annual Annuity (EAA). The results of production model showed that A. dammara stands would reach optimum production at the age of 25 years while that of E. zwageri at the age of 150 years. A. dammara stands produce higher MAI of 15.67 m3ha-1 year-1 and total volume of 383.72 m3ha-1 than E. zwageri with MAI 1.89 m3ha-1 year-1 and total volume of 282.78 m3ha-1. The result of financial analysis showed that A. dammara plantation had the IRR higher than the Minimum Acceptable Rate (MAR) and the Net B/C Ratio of higher than 1, while E. zwageri had the Net B/C Ratio of lower than 1. A. dammara plantation also had a positive NPV value of IDR 78,699,974 while E. zwageri plantation had a negative NPV value of IDR 91,439,292. These results suggest that developing A. dammara plantation is more desirable than E. zwageri plantation.

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“…The density of the number of plants also takes on an important meaning by increasing the spacing. Characteristics of wood such as ruptured modulus, elastic modulus, tangential compressive strength and tangential shift of grain except tangential to granules are not indicated by an increase in distance (Zahabu et al, 2015). The expansion of agriculture has resulted in large-scale habitat loss, the fragmentation of forests, significant losses in biological diversity and negative impacts on many ecosystem services Basu, 2014;Iskandar, 2016;Luedeling et al, 2014).…”

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confidence: 99%

“…Excellence as tropical hardwood is very valuable due to strength, straightness, workability, resistance to many pests and diseases and is now known as exotic wood (Jenkins et al, 2002) used for high-quality handicraft industries. Its spread is in almost all tropical regions except desert regions in Africa (Zahabu et al, 2015;Guzmán et al, 2017;Wanneng et al, 2014). Sungkai (Peronema canescens) is a native and local species and one of some commercial trees which has a good prospect to be developed in timber estate in Kalimantan (Wahyudi et al, & Panjaitan, 2014).…”

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confidence: 99%

Model of Community Forest Land Management Production and Financial Simulation of Super Teak, Solomon Teak and Sungkai Trees in Samboja Kutai Kartanegara East Kalimantan, Indonesia

Setiawan¹,

Lahjie²,

Yusuf³

et al. 2019

EER

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The objective of the research were to determine the volume increments, to find out the optimum ages and maximum increment, to know which plant effort was more profitable than each types exploitations, to analyze the financial feasibility and to know the farmers' financial needs and the level of interest by sensitivity analysis. This research was conducted in community forest of Sungai Merdeka Village Km. 38 Samboja District, Kutai Kartanegara Sub District of East Kalimantan Province. The research data was taken based on a purpose sampling system in the research plots of each Model I to V covering an area of 0.25 ha. Model I consisted by super teak 15 years 10x2 m spacing combined with king grass with an interest rate of 5% resulted in an estimated 6.5-year Pay Back Period (PP); Net Present Value (NPV) Rp. 186,346,058, -; Net Benefit/Cost (B/C) Ratio 3.99; Internal Rate of Return (IRR) 28%; Equivalent Annual Annuity (EAA) Rp. 12,122,078 and effort scale of 3 ha. Model II consisted by super teak 15 years 10x10 m spacing with an interest rate of 5% produce an estimated 18.5-year PP; Rp. (15,890,541,-) NPV; Net (B/C) Ratio to 0.72; (IRR) to 3%; (EAA) to Rp. (1,033,703,-) and (41) ha effort scale. Model III consisted by Solomon Teak 13 years 10x10 m spacing with an interest rate of 5% produce an estimated 10.4 year (PP); (NPV) to Rp. 97,546,242, -; Net (B/C) Ratio to 2.38; (IRR) to 10%; (EAA) to Rp. 6,345,523,-and 7 ha effort scale. Model IV consisted by sungkai 13 years 2x4 m spacing combined with papaya by an interest rate of 5% produce an estimated 13.1 years (PP) value; (NPV) to Rp. 41,099,472, -; Net (B/C) Ratio to 1.83; (IRR) to 22.5%; (EAA) to Rp. 2,673,580, -and 16 ha effort scale. Model V consisted by Sungkai 13 years with an interest rate of 5% produced an estimated 18.1 year (PP); (NPV) to Rp. -13.141,863, -; Net (B/C) Ratio 0.73; (IRR) to 3.2%; (EAA) to 897, ha effort scale. Its concluded that by 5% discount factor, Model I, Model III and Model IV were feasible because they have an IRR value higher than Minimum Acceptable Rate (MAR) 5% and Net B/C Ratio higher than 1. Model II and Model V were not feasible because they have an IRR value lower than MAR 5% and Net B/C Ratio lower than 1. The optimum production of all models was reached at the ages of 25 years. The highest MAI was achieved in Model IV of 7.34 m 3 ha -1 year -1 and the total volume was 183.56 m 3 ha -1 year -1 , while the lowest MAI was achieved in Model II of 6.25 m 3 ha -1 year -1 and the total volume was 33.10 m 3 ha -1 year -1 . Based on the analysis of effort scale resulted that Model I could be the best choice and most feasible than other because it had the lowest effort scale value, while Model V was the least feasible option to be cultivated because it has the highest scale of effort. Model I, Model III and IV shown the NPV positive value to Rp. 186,346,058, Rp.97,546,242,099,472, while Model II and Model IV shown the negative value of Rp. (15,590,541,-) and Rp.(13,141,863,.

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Effect of Spacing Regimes on Growth, Yield, and Wood Properties ofTectona grandisat Longuza Forest Plantation, Tanzania

Cited by 33 publications

References 9 publications

Growth and yield of teak stands at different spacing

Growth and yield of teak stands at different spacing

Assessing the feasibility of forest plantation of native species: A case study of Agathis dammara and Eusideroxylon zwageri in Balikpapan, East Kalimantan, Indonesia

Model of Community Forest Land Management Production and Financial Simulation of Super Teak, Solomon Teak and Sungkai Trees in Samboja Kutai Kartanegara East Kalimantan, Indonesia

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