FACULTY OF AGRICULTURE

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Subject: search.filters.subject.Floristic structure

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    Attributes and ecological potentials of dumpsite flora in the peri-urban area of Ibadan, Nigeria
    (2023) Olubode, O.S.; Ibrahim, B.A.
    Dumpsites are spaces used disposal of urban and peri-urban wastes. Their public health concern has not made them to be adequately explored for positive potentials in Nigeria. This study investigated the the floristic structure and comparative potential of a dumpsite with arable farms for conservation and phytoremediation. The study was conducted at a 10-hectare peri-urban Lapite dumpsite (N 07o34.121ʹ, E 003o54.857ʹ) in Ibadan, Oyo State, Nigeria; and three arable farmlands (Control) located 200 m-300 m away from Dumpsite. Stratified sampling was conducted using 414 quadrats (each 1m2) in five strata of dumpsite, and a systematic sampling of flora of farms with 263 quaddrats in 21 transects laid 5 m apart. Data were collected on species composition, abundance,density and frequency of occurence. They were subjected to analysis of Relative importance value (RIV), density, and multivariate analysis. Species with phytoremediation potentials were identified. Ninety one species of herbaceous flora in 33 families and 99 species in 38 families were enumerated on the dumpsite and farmlands respectively. Solanum nigrum L., Tridax procumbens Linn., Amaranthus spinosus Linn., Laportea aestuans (Linn.) chew., Acalypha fimbriata Schum. & Thonn., and Lufa cylindrica Mill were the most dominant species on the dumpsite with RIVs of 8.40, 8.17, 7.54, 7.21, 6.38 and 5.79 respectively. Talinum fruticosum (L.) Juss., Tridax procumbens L., Euphorbia heterophylla Linn., Spermacoce ocymoides Burm f., and Tithonia diversifolia (Hemsl.) A. Gray were most dominant on farmlands with RIVs of 13.74, 7.05, 6.60, 6.07, and 5.57 respectively. Dumpsite flora had higher diversity (H`=3.501) than control plots (H`=3.294). The dominance value (0.0486) was low compared to the control farms (0.07131). The lora of the two sites were grouped by habitatt preference.Higher species diversity and pervasive presence of invasive Tridax procumbens linn., Laportea aestuans (Linn.) chew., and Lufa cylindrica Mill. On dumpsite indicated potentials for phytoremediation, and candidacy as functional groups and bio-indicators of ecosystem health.
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    Assessment of soil seedbank composition, woody species composition and structure in olokemeji forest reserve, ogun state, nigeria.
    (2017) Taiwo, D.M.; Olubode, O.S.; Oyelowo, O. J.
    Olokemeji forest reserve has undergone tremendous changes through anthropogenic impact on the forest ecosystem, such human impacts include farming activities, logging of wood and burning. The soil seed bank composition, woody species composition and structure were studied with a view to determine the restoration potential of the forest reserve. Six sample plots (Frequently burnt plot 1, Frequently burnt plot 2, Harvested plot, Unharvested Unburnt plot, Arable plot 1 and Arable plot 2) designated as FT1, FT2, HP, UP, AP1 and AP2 were randomly selected. Floral species identification, relative importance value (RIV), species diversity and multivariate analysis all followed standard procedures. Three replicate soil samples were collected at two different depths (0-15 cm and 15-30 cm) from each plot and they were subjected to seedling emergence for five months to determine the species composition, density and diversity of the seed banks of the six study plots. The results of seedling emergence showed that soil collected at 0-15 cm depth had a higher RIV, species diversity, individual, abundance and dominance index than soil collected at 15-30 cm depth. However, the evenness index for seedlings in the soil seed bank was considerably high across the two soil depths which depicted equal measure of spread within each study plots at both soil depths. Tectona grandis was highest in RIV. The dominance index for the woody flora was 1 in frequently burnt Plot 1 and 2 as well as Arable Plot 1 and 2 except for the Harvested Plot that had the lowest (0.29) while the . Unharvested unburnt Plot had 0.75. The diversity in Harvested Plot was low (1.54), while it was extremely low in Unharvested unburnt Plot (0.43). Trees in Unharvested unburnt Plot had the highest mean diameters at breast height, basal areas and mean heights, while the Arable Plots had lowest mean diameters at breast height, mean basal areas and mean heights.