RESILIENCE OF SOIL BACTERIAL AND FUNGAL COMMUNITIES AFTER APPLYING CRUDE OIL TO FIVE DIFFERENT LAND USE TYPESABRAHAM I OGBOGHODOA AND OREVAOGHENE ALIKUA B.
Contamination of soil arising from spills is one of the most limiting factors affecting microbial activities. An incubation study was conducted to examine the effects of crude oil application on soil bacteria and fungi under five land use types. Soils were randomly sampled with an auger at 0-15, 15-30, and 30-45 cm depth from five locations respectively. Microbial counts were analysed using analysis of variance and least significant difference. 20 mL crude oil was applied Homogenously on all the soil samples. Bacterial and fungal counts increased with increase in soil depth at various weeks after pollution. The highest mean bacterial and fungal counts (44.49 x 103 cfu and 34.89 x 103 cfu g-1 soil) were recorded at 4 weeks. Forest vegetation had the highest mean bacterial count (54.24 x 103 cfu g-1 soil), while citrus orchard, poultry farm, residential area, and okra farm had 42.61, 36.83, 28.50 and 41.26 x 103 cfu g-1 soil respectively. Okra farm had the highest mean fungal count (39.76 x 103 cfu g-1 soil), while citrus orchard, forest vegetation, poultry farm, and residential area had 31.29, 28.48, 33.02 and 28.83 x 103 cfu g-1 soil respectively. There were significant differences (p<0.05) among the interactions.
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