Indigenous tree species like Terminalia ivorensis has multiple uses; from timber products to medicinal condiments for treating different ailments. This species is self-incompatible. Thus, habitat protection is a key to its survival and sustenance. This study evaluated the effect of provenance variations on the growth and development of T. ivorensis. Three provenances of T. ivorensis were selected; FRIN Arboretum, Onigambari Forest Reserve and J1 Forest Reserve. Thirty (30) seedlings of T. ivorensis were selected and marked at each provenance for assessment of growth parameters for a period of twelve weeks. The growth parameters included: seedling height, collar diameter, leaf count and leaf area. Also, soil samples were collected from each provenance to test for nutrient composition. Results showed that J1 Forest Reserve had best performance across the growth parameters assessed with 10.4 cm plant height, 2.02 mm collar diameter, 11 leaves count and 20.5 cm2 leaf area respectively. This growth parameter result differs significantly from the other two provenances. This was also attributed to the nutrient offered by J1 Forest Reserve with 1.18% and 2.20% of organic carbon and organic matter in the soil respectively. Also, the available phosphorus which is involved in photosynthesis, respiration, energy storage and transfer, cell division and enlargement as well as promotion of root formation was about 15.7 mg/kg in the soil and is considered high because it is higher than the critical level of 8.50mg/kg. J1 Forest Reserve is recommended as the best provenance for raising T. ivorensis amongst assessed natural habitats.
This study was conducted to monitor some area carbon in Adekunle Ajasin University Akungba (AAUA) Campus to encourage tree planting alongside her edifice and discourage high rate of deforestation. This study relies solely on the use of remote sensing data to estimate carbon sequestration between year 2014 and 2020. The objective of this study is to estimate the carbon sequestration capacity in the study area using remote sensing (RS) and geographical information system (GIS) with a view to enkindling the importance of trees or forest within the University campus. Consequently, Landsat 8 TM Satellite images of year 2014 and 2020 of the study area were obtained from United States Geological Survey (USGS). The spectral vegetation index (normalised difference vegetation index) was estimate using spectral bands 4 and 5. Ten areas were chosen for this study and their coordinates obtained using GPS receiver when visited. These areas were not developed in 2014 and not fully developed as at year 2020. Through normalised difference vegetation index (NDVI) spread using Water scaler, Evapotranspiration, Potential evapotranspiration (PET), Absorbed photosynthetic active radiation (APAR) and Fraction of absorbed photosynthetic active radiation (FAPAR). The biomass carbon values were generated and the mean biomass carbon values were obtained. It was observed that 2014 had a mean biomass of 7.83 kg/m3 while the figure was 2.47 kg/m3 for 2020. The biomass carbon values per hectare were obtained as 87.00 kg/m3/ ha and 27.40 kg/m3/ ha for 2014 and 2020, respectively. Total biomass carbon of 69, 951.62 kg/m3 and 22, 031.93 kg/m3 were sequestered in 2014 and 2020, respectively for the entire study area. Results of biomass carbon for the designated locations and year using t-test were significantly different at P > 0.05. Therefore, carbon sequestration in the year 2014 was higher and better than those obtained in the year 2020 and this reduction could be attributed to forest degradation or loss of vegetation in the study locations. For environmental and carbon friendly atmosphere, green plants are encouraged to be included within urban development plan in the university campuses.
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