FLORA SPECIES COMPOSITION AND DIVERSITY ON SUBSISTENCE AND FALLOW FARMLANDS IN THE SUBURBS OF IBADAN METROPOLIS, NIGERIA
Keywords:
Rainfall pattern, Household food security, Ibadan, Nigeria, Climatic conditionsAbstract
Restoration techniques are a strategy required in managing farmlands adjoining urban sprawls to
engender regeneration of vegetation following extended periods of cultivation and fallow. Scholarly
information concerning land regeneration through fallow practice still remains unknown. This study thus
discusses an evaluation of tree species on subsistence farming parcels in the Suburbs of Ibadan
Metropolis, Nigeria. Four (4) randomly selected transects of 100m 120m×30m intervals, were established
across the six (6) semi-urban local governments: (Akinyele, Egbeda, Ido, Lagelu, Ona Ara, and Oluyole,
LGAs), resulting in twenty four (24) transects for the entire study area. Three (3) 8m×8m quadrats were
randomly selected and established along each transect. Flora survey within the study site was carried out.
Diameter at breast height (DBH)(cm) and height (h)(m) of trees-species ≥10cm, seedlings and saplings
with a diameter of less than 10cm were measured, respectively. Tree species≥10cm, and
seedlings/saplings ≤10cm, were determined. Plant identification was determined using the Kew-Tropical
Handbook. A semi-structured questionnaire was administered to farmers to identify the length of farming
and fallow periods. Data was analysed using QGIS, Shannon's Index of Diversity, Correlation, and
ANOVA. Results showed that 81% of the 38 tree-species were found within the study area. Relationship
between farming/fallow period and tree-species <10cm dbh was significant (β2 = 0.682). Anacardiaceae
was the most prevalent within the study area. Tree species’ abundance increased during fallow for up to
six (6) years. There was no correlation between the age of abandoned farmlands and plant diversity or
richness, but there was for seedlings and saplings.
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