scholarly works

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Population structure and threats to sustainable management of woody plant species in a Semi-Arid Agro-Ecosystem in Nigeria
(2016) Dauda, T.H.; Jimoh, S.O.; Azeez, I.O.
This study was conducted to assess population structure and threat to the sustainable management of woody species in the various ago-ecosystems in Dutsin-Ma Local Government Area (LGA) Katsina State, Nigeria. Purposive and stratified random sampling techniques were used to collect data from 21 randomly demarcated 100m × 100m sample plots. All woody plant species found in the sample plots with stem diameter >2 cm at 20cm above ground, were recorded. Population structure was summarized by diameter classes. For the identification of threats, field and questionnaire surveys were used. A total of 50 questionnaires were distributed at ten questionnaires per ward in five out of the 11 wards in the LGA. The highest numbers (350) of small diameter trees (0.1-1.0cm) were recorded in the agrosilvopastoral system. This was followed by silvopastoral and agrisilviculture systems with 89 and 85, respectively. However, the highest number of large diameter woody tree species was recorded in the silvopastoral system followed by agrosilvopastoral and agrisilviculture systems. The regular reverse J-shaped and fairly regular reverse J-shaped size class distribution observed for agrosilvopastoral and silvopastoral respectively, suggest a recuperating population. Over exploitation, debarking, de branching, root digging, leaf harvesting, seed harvesting, poor regeneration, slow rate of growth, wind effect and bush burning were the major threats to sustainable management of woody plant species in the study area. The implications of our findings for sustainable management of woody plant species in the study area are discussed and recommendations made
Densities and Distribution of Vitellariaparadoxa C.F.Gaertn. and Parkia biglobosa (Jacq.) R.Br.ex G.Don. in Agro-ecosystems in Oyo State, Nigeria
(Ecological Society of Nigeria, 2012) Jimoh, S .O.; Asinwa, I. O.
Population increase has led to increased pressures on many socioeconomically and ecologically important tree species including Vitellaria paradoxa C.F.Gaertn.and Parkia biglobosa (Jacq.) R.Br.ex G.Don. This portends great threats to the continued existence of such species including the myriads of goods and services they provide. There is need to put on record, scientific evidence of the current status of these species in order to draw attention to the pressures on their populations and the need for deliberate actions for their conservation and sustainable management. We assessed densities and distribution of Vitellaria paradoxa and Parkia biglobosa in some agro ecosystems in Oyo State, Nigeria with a view to generating information on the current stocking of the species in the various ecosystems and provide base line data for subsequent resource monitoring and sustainable management planning. Oyo State was stratified into three agro-ecological zones viz: dry-woodland/Southem Guinea savanna, moist-woodland/derived savanna and rainforest. A multistage sampling procedure was used in collecting data on densities and distribution of Vitellaria paradoxa and Parkia biglobosa in the agro ecosystems through field survey. Descriptive statistics, cross tabulation, simple t-test and analysis of variance (ANOVA) were used to analyze the data. Student’s t-test and analysis of variance indicate that there was no significant difference at 5% level of probability in the densities of V paradoxa and P. biglobosa in the cultivated and fallow land. Potential mother trees for regeneration were found mainly on crop farms while younger trees dominate the fallow plots. This is an indication of extraction of older trees on fallow plots apparently for domestic energy supplies. It is recommended that the management of V. paradoxa and P. biglobosa should be intensified through enrichment planting and deliberate cultivation in plantations in order to meet the high demand pressures on their populations
Influence of sustainable use of environmental goods and services on the green economy goals in African countries
(Forestry Association of Nigeria, 2013) Adewole, N.A; Ogunsanwo, O.Y; Azeez, I.O
This paper reviewed the status of environmental goods and services utilization in Africa viz-a-viz the goal of green economy. A systematic appraisal of the potential of utilizing forest goods and services in a sustainable manner to reduce the striking poverty in Africa is one of the focuses of this paper. It identified the challenges slowing down the development of environmental goods and services in a sustainable manner to guarantee green economy in Africa. The paper recommends urgent action in the direction of poverty and ignorance reduction by governments in Africa. This will engender sustainable utilization of goods and services in African states' indigenous communities towards meeting the green economy goals.

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