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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.
Floristic composition, diversity and community structure in a secondary rainforest in Ibadan, Nigeria
(2021) Seyni, B.M.; Awodoyin, R.O.; Olubode, O.S.; Adeniji, S.A.; Ibrahima, D.B.
Secondary forests may act as buffer area and serve as reservoir for biotic components that are lost from primary forest due to anthropogenic disturbances. This study investigated the floristic composition, diversity and community structure of Cocoa Research Institute of Nigeria (CRIN), Idi-Ayunre, Ibadan, Nigeria. Twenty-five main plots (each 50 m × 50 m) were randomly mapped out to enumerate tree species, five 10 m × 10 m sub-plots were systematically mapped out within each main plot to enumerate shrubs and three quadrats (1 m × 1 m) were laid in each sub-plot to enumerate herbaceous species in Wet Season (WS) and Dry Season (DS). Relative Importance Value (RIV), Taxa, Individuals, Dominance, Shannon-Wiener, Equitability and Jaccard similarity index were determined. A total of 181 plant species from 145 genera and 54 families which included 63 trees, 33 shrubs and 85 herbaceous species were enumerated. In wet season, Triplochiton scleroxylon, Lonchocarpus griffonianus and Chromolaena odorata had the highest RIV while in dry season, Terminalia superba, Lonchocarpus cyanescens and C. odorata were the highest for trees, shrubs and herbs, respectively. Low dominance but high equitability and Shannon-Weiner values indicated inter-specificity among trees, shrubs and herbs. It was only in herbs that Jaccard-similarity was less than 100% across seasons. Resilience for keystone species conservation is possible due to flora species heterogeneity of the study site.
Structure and composition of woody species in riparian forest in the university of agriculture, Abeokuta, Nigeria
(2014) Oladoye ,A.O.; OIubode ,O.S.; Odeyale, O.O.; Ola, J.A.
Understanding the nattma of £/->s forests in She tropics is crucial So resource managers. Forests in Nigeria are if ;t at a high re'xs The structure and floristic composition of remaining forests are largely who m. Structure an / floristic composition in a riparian forest of the Federal University of Agriculture, Abeokuta, Niger*- f was assessed. Fifteen sample plots of 0.625ha each were used to assess all plants > 5cm diameter at breast height (dbh) in each plot for density, height dbh and frequency. Detrended Correspondence Analysis (DCA), similarity and diversity statistics were used to analyse the data am Importance Value Index estimated. The result of the study identified 504 individual woody speck s srom 25 species of 16 families. Papelionaceae had the highest species (4). Anmuriceae, Mimosacca ?, Myr&aceae, Cochlospermaceae, Euphorbiaceae, Apocynaceae and A vice.1 niaceae had 1 spe des each. DanieSHa oliveri had the highest density (302 plants/ha) and Impt ■Sauce Value It dex IVIJ of (108.01%). The lowest density was found in Bauhinia tcmentosa, Nan lea diderrichii. / d Maltheria indies (5 plants/hectare) and 1V1 of 2.85%, 5.10% and 2.39% res jecb'vely. The high si basal area was estimated for Danisilia oliveri (71.175m2), the lowest was re, arded far Maiadm ita- alnifolsm (0.107m2). The cumulative stem diameter class of 5-65cm s\ counted for 78. Id1} of the total number of stems in the forest estate. Tree height ranged from ■ 6.4 to 22.7m. Simps* 7s similarity and diversity index ranged between 0.143 to 0.875 and 0.43 to 0.89 respective y at J equitability index ranged from 0.61 to 0.93 for all the plots, while the basal ares ranged from 8.052m2/plot to 27.809nr/plot. High Eigen value (54%), the length of ordination space coverage (-2 to 4).Th@ location of pH the plots in the first quadrant indicates that the envimnmmt k stable; variation in the floristic composition between the plots Is minimal with high heterogeneity in the site and high species richness recorded reflects the heterogeneous distribution patt im in species compositioh. Conclusively, this study has shown that riparian forests may act as a catalyst for successful natural forest succession thus sustaining native forest flora and habitat for fastnp.

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