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Welcome to UISpace, The University of Ibadan Institutional Repository. A collection of theses, articles, books, videos, images, lectures, papers, data sets and all types of digital content originating from the University of Ibadan Nigeria. This repository is managed by the Kenneth Dike Library University of Ibadan, Nigeria.
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Comparison of Tree Volume Estimates Obtained by Different Methods for Gmelina Arborea in Omo Forest Reserve, Southwest Nigeria
(Forests and Forest Products Society, 2010) Alo A. A.; Akindele S. O.; Onyekwelu J. C.
Volume estimates obtainedfrom four different methods oftree volume estimation were compared with a view to determining the most precise method. The major difference between the methods lies in the position where the diameter used in the volume estimation was obtained. The methods include the “Bolt method” which requires dividing the entire stem into “bolts ” so that diameter measurements are made at both ends of each bolt. Other methods are the Huber s method which requires diameter measurement at the middle position along the stem, Smalian’s method where diameter measurements are made at the base and top of the stem, and Newton’s method which takes diameter at base, middle and top positions along the stem. Data for the study were collectedfrom six different age series (13, 15, 19, 20, 24, and 25 years old) of Gmelina arborea plantations in Omo forest reserve, Nigeria. The determination of the volume of trees using the “Bolt method” requires tree felling so that the stem of each tree could be sectioned into bolts for detailed measurement. Due to the destructive nature of the procedure, only five trees per age series were selected. Prior to felling, the diameter of each tree at base, middle and top positions along the bole and the merchantable height were measured. Each sample tree was then felled and cross-cut into bolts whose length and diameter were measured for volume computation. The volume of the bolts that made up a bole and the stump volume were added to obtain the merchantable volume for the tree. For each felled tree, Huber, Smalian and Newton’s formulae were also applied to the tree data obtained before felling in order to obtain volume estimates. One-way analysis of variance (ANOVA) was used to test for significant differences in tree volumes obtained by the four methods. The results indicate that there were . significant differences in the volume obtained using the four methods. Bolt s method of tree volume estimation produced the most accurate tree volume in this study since it accommodates all irregularities along the stems of the trees.
Contribution of forestry towards the attainment of the millennium development goals in Nigeria
(Forestry Association of Nigeria, 2011) Alo, A.A.; Akindele, S. O.
The Millennium Development Goals (MDGs) are eight international development goals that all 193 United Nations member states and at least 23 international organizations have agreed to achieve by the year 2015. The aim of the MDGs is to encourage development^ improving social and economic conditions in the world's poorest countries. Of the eight goals, goals 1 and 7 are of direct relevance to forestry. Goal 1 is to eradicate extreme poverty and hunger. The set targets are to halve the proportion of people living on less that $1 a day; achieve decent employment for women, men and young people; and halve the proportion of people who suffer from hunger. On the other hand, Goal 7 is to ensure environmental sustainability. The first target is to integrate the principles of sustainable development into country policies and programs, and reverse the loss of environmental resources, while the second target is to reduce biodiversity loss. In this paper, the contributions of forestry to the attainment of the goals are highlighted. The paper emphasized the importance of the forestry sector towards achieving the MDGs. Present challenges are also mentioned and recommendations made on how to mitigate them.
Relevance of geographical information system in forest resource assessment and management
(2012) Alo, A.A.; Akindele, S. O.
Geographical Information System (GIS) in forestry is basically applied in resource assessment and manager Resource assessment activities include: inventory of forest resources, for timber, fuel, food, recreation conservation purposes, along with related data such as topography, soils, roads, and hydrology; monitoring cha that occur in these resources over time as a result of deforestation, conversion of natural forest into farmland plantation, conversion of forest land into agricultural purposes as well as urbanization; and evaluating potential land productivity for forest types given certain biophysical and climatic factors. On the other hand, res management activities include: Timber harvesting for wood supply; fuel wood demand and supply for household and commercial uses; fire management as it relates to fire prevention, wildlife control, prescribing burning, and post-fire recovery actions, In this paper, major areas of forestry where geographical information 'S} is relevant are highlighted. Present challenges are also mentioned and recommendations were made on ho mitigate them.
Deforestation Assessment in Ikere Forest Reseerve, Nigeria Using Geographic Information System Technology
(Forests and Forest Products Society, 2016) Alo, A.A.; Akindele, S. O.
Digital Elevation Model (DEM) is a very important geospatial data used in modeling different hydrological and ecological phenomenon which are required in preserving our micro environment. DEMs are typically used to represent terrain relief. DEMs are particularly relevant for many applications such as lake and water volumes estimation, soil erosion volumes calculations, flood estimate, quantification of earth materials to be moved for channels, roads, dams, embankment etc. In this study, a total of 1,849 points coordinates with their respective elevations were obtained covering the entire study area. The algorithm used includes interpolated natural neighbour of Quantum Geographic Information System (QGIS) to generate Digital Elevation Model (DEMs) for the forest reserve. The contour lines were extracted from DEM at interval of 20 m from one another. It was observed that the presence of Omo river at the southern part of the reserve is responsible for the very low altitude obtained. On the other hand, the altitude at the northern part of the reserve is relatively high because of the presence of rock outcrop, which also makes the vegetation to be scanty. Therefore, Geographic Information System was used to develop Digital Elevation Model for Omo forest reserve to serve as baseline information for the study area.
Development of Digital Elevation Models for Omo Forest Reserve Nigeria
(Commonwealth Forestry Association, 2016) Alo, A.A.
Digital Elevation Model (DEM) is a very important geospatial data used in modeling different hydrological and ecological phenomenon which are required in preserving our micro environment. DEMs are typically used to represent terrain relief. DEMs are particularly relevant for many applications such as lake and water volumes estimation, soil erosion volumes calculations, flood estimate, quantification of earth materials to be moved for channels, roads, dams, embankment etc. In this study, a total of 1,849 points coordinates with their respective elevations were obtained covering the entire study area. The algorithm used includes interpolated natural neighbour of Quantum Geographic Information System (QGIS) to generate Digital Elevation Model (DEMs) for the forest reserve. The contour lines were extracted from DEM at interval of 20 m from one another. It was observed that the presence of Omo river at the southern part of the reserve is responsible for the very low altitude obtained. On the other hand, the altitude at the northern part of the reserve is relatively high because of the presence of rock outcrop, which also makes the vegetation to be scanty. Therefore, Geographic Information System was used to develop Digital Elevation Model for Omo forest reserve to serve as baseline information for the study area.