Yields and nutrient pools in soils cultivated with Tectona grandis and Gmelina arborea in Nigerian rainforest ecosystem

Adekunle, V. A. J.; Alo, Akintunde; Adekayode, F. O.

doi:10.1016/j.jssas.2011.05.001

Cited by 12 publications

(19 citation statements)

References 7 publications

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“…Of the two species in Kasewe, Gmelina arborea proved better in terms of vertical and horizontal growth with mean DBH and height of 29.0 cm and 20.34 m, respectively, compared to Tectona grandis with mean DBH and height of 21.57 cm and 15.81 m, respectively. The results were in agreement with the findings of [12,13] in Nigeria and [14] in India.…”

Section: Stand Volumesupporting

confidence: 92%

“…This was estimated using the formulae according to Eqs. (12) and (13) [23]; a form factor of 0.562 from Mattia and Dugba [25] for natural mangrove forest (comprised of seven mangrove species) in Tanzania was employed:…”

Section: Wood Volume Ha à1mentioning

confidence: 99%

“…The following equation was adopted for estimating biomass of the natural forest [31]: AGB ¼ 0:0547 * DBH 2:2148 * Ht 0:6131 (13) And the scaling factor applied was 10,000/(314.16).…”

Section: Estimation Of Live Tree Biomass and Carbon Stock For Singambmentioning

confidence: 99%

“…Forest resource assessment in relation to timber volume [11][12][13] and carbon stocks [14,15] provides information about the status of the productivity of the forest. This assessment is traditionally done through ground forest inventory.…”

Section: Introductionmentioning

confidence: 99%

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Ground Forest Inventory and Assessment of Carbon Stocks in Sierra Leone, West Africa

Sesay¹

2021

Natural Resources Management and Biological Sciences

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Forest and woodland are renewable natural resources providing basic human necessities. They have the ability to sequester carbon and mitigate climate change. Sustainable forest management is guided by forest mensuration and inventory which include measuring and calculating growth and changes in trees and forests. The objective of the study was to estimate timber resources and carbon stock using simple hand tools in Kasewe and Singamba forests in the southern part of Sierra Leone. All trees with diameter at breast height (DBH) ≥ 10 cm were measured in every plot for DBH, and three trees were measured for height. The correlation between mean wood volume and carbon stock was highly significant. For Kasewe plantation forest, mean wood volume and carbon stock were 151 m 3 ha À1 and 44 t C ha À1 , respectively, and for the Singamba natural forest, they were 181 m 3 ha À1 and 82 t C ha À1 , respectively. The linear correlation between basal area and volume, DBH and volume and basal area and total biomass was significant for the plantation species tested. Realistic national forest inventory and community forestry are inevitable for sustainable forest management in Sierra Leone.

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Section: Stand Volumesupporting

confidence: 92%

Section: Wood Volume Ha à1mentioning

confidence: 99%

“…The following equation was adopted for estimating biomass of the natural forest [31]: AGB ¼ 0:0547 * DBH 2:2148 * Ht 0:6131 (13) And the scaling factor applied was 10,000/(314.16).…”

Section: Estimation Of Live Tree Biomass and Carbon Stock For Singambmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ground Forest Inventory and Assessment of Carbon Stocks in Sierra Leone, West Africa

Sesay¹

2021

Natural Resources Management and Biological Sciences

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“…The wide variety of soil fertility levels in teak plantations of Central America has also been observed in Africa. Ombina (2008) reported teak plantations on low fertility soils in Southern Sudan, Zech and Drechsel (1991) found generally deficient soils in Liberia, while Adekunle et al (2011) described relatively high fertility soils in Nigeria. Similarly, Drechsel and Zech (1994) found a variety of rich and poor soils in Togo, Benin, Côte d'Ivoire, Liberia and Nigeria.…”

Section: Resultsmentioning

confidence: 99%

Soil fertility characterisation of teak (Tectona grandis L.f.) plantations in Central America

et al. 2015

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Teak (Tectona grandis L.f.) is an important species in the worldwide quality tropical hardwood sector, which has gained significance in Central America since the first large plantations were established in the 1980s. The present work is a descriptive study that aims to: (1) analyse and characterise the general soil patterns which may be influencing teak plantations in Central America; (2) assess differences between countries and sub-regions; (3) create a global framework to help contextualise the soil fertility analyses conducted at sub-regional or farm level, and (4) determine the main problems associated with soil fertility in the region. Soil fertility was measured at 684 sites in Costa Rica, Guatemala and Panama. Although teak is considered to be a species with high soil nutrient requirements, and high fertility is usually assumed in teak plantations, the results show that this species has been planted in a wide variety of soils, including many with serious fertility problems (e.g. Ultisols and perhaps Oxisols) or with added difficulties due to their physical properties (e.g. Vertisols). The present analysis reveals a general K deficiency in the Central American teak plantations, where P deficiency and acidity toxicity are also relatively common problems. These soil fertility problems probably stem from poor site selection by forest managers in the 80s and 90s. Hence, although soil fertility is carefully evaluated when most teak plantations are established today, managers have to deal with soil fertility deficiencies in many sites where teak was established some years ago.

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Characterization of Selected Nigerian Biomass for Combustion and Pyrolysis Applications

Akinrinola¹,

Darvell²,

Jones³

et al. 2014

Energy Fuels

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Biomass is the most utilised form of renewable energy, especially in developing nations, and is a possible replacement for fossil fuel in power generation. The most commonly used method for recovering energy from biomass is combustion. Many countries are exploring the utilisation of energy crops and indigenous residues to deliver sustainable sources of biomass. For these bioresources, detailed characterisation of the fuel properties is essential in order to optimise the combustion processes. In this study, some potential energy crops and woods from Nigeria, namely Terminalia superba, Gmelina arborea, Lophira alata, Nauclea diderrichii, and also one 2 abundant agricultural residue, palm kernel expellers (PKE) were characterised for their combustion properties. Standard characterisation methods such as proximate and ultimate analyses, metals analysis, and ash fusion test were used for this purpose and the results were compared to some UK biomass. In addition, their thermal conversion was assessed by thermogravimetric analysis and pyrolysis-gas chromatographyÐmass spectrometry. Finally, combustion studies were conducted by suspending single biomass particles in a methane flame to obtain information on reactivities and combustion characteristics. Results indicate that the ash fractions in the Nigerian woods were low in K, Si, and Ca, resulting in low calculated alkali indices, hence these fuels are not predicted to cause severe fouling problems. Furthermore, the analysis of the evolved product during devolatilisation from Py-GC-MS suggests that the content of oil is high in Gmelina. Finally, the results from the single particle combustion experiments revealed longer char burn out rate for Lophira and Nauclea when compared with those of Terminalia and Gmelina.Keywords: biomass, torrefaction, energy, combustion, pyrolysis. Nigeria has large reserves of gas and solid minerals, and the largest oil reserves in Africa.Consequently the country has a very high dependence on crude oil, which contributes seedling nurseries, and plantation management [7]. Woods in the plantations include Gmelina, Terminalia, teak, eucalyptus, and pine. Tropical rain forest is the major source of timber supply and energy crops in Nigeria with high plant diversity of over 4,600 plant species. The forest covers 10% of the countryÕs land area with over 560 tree species at a range of about 30 to 70 species per hectare for trees ≥ 5 cm diameter at breast height (dbh) [8].Terminalia superba is a tree found in the tropical lowland forest in Nigeria. The tree is planted around April at the beginning of the rainy season, and thrives on rich, well-drained alluvial soils, although it can also be cultivated on other soil types namely lateritic sands, gravel and clays, lava, black basaltic clays and crystalline soils. The wood air dries rapidly, degrades slightly and is lightweight to medium-weight, with a density ranging from 370Ð730 kg/m³ at a moisture content of about 12% [9]. Once the wood is dried, it becomes stable. The chemical composition

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Yields and nutrient pools in soils cultivated with Tectona grandis and Gmelina arborea in Nigerian rainforest ecosystem

Cited by 12 publications

References 7 publications

Ground Forest Inventory and Assessment of Carbon Stocks in Sierra Leone, West Africa

Ground Forest Inventory and Assessment of Carbon Stocks in Sierra Leone, West Africa

Soil fertility characterisation of teak (Tectona grandis L.f.) plantations in Central America

Characterization of Selected Nigerian Biomass for Combustion and Pyrolysis Applications

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