Soil Seeds Bank and Floristic Diversity as Affected by Spent Engine Oil
Journal Title: Universal Journal of Environmental Research and Technology - Year 2014, Vol 4, Issue 2
Abstract
This study investigated the impact of spent engine oil (SEO) on the regeneration capacity of soil seed bank, growth and floristic diversity of a polluted soil. Top soil (0-10 cm) of 400 g with no previous contamination of SEO was collected from Lafia, Nasarawa State, Nigeria and treated with 0.00%, 2.50%, 5.00% and 10.00% of SEO respectively in a complete randomized design with three replicates. Eight weeks after treatment, five plant species identified growing on 0.0% and 2.50% SEO were Desmodium canadense, Malvaviscus arboreus, Pennisetum purureum, Sida acuta and Cyperus strigosus. Pennisetum purureum was absent in soil polluted with 5.00% SEO. No plant species was found growing on the soil polluted with 10.00% SEO. Plant diversity decreased as levels of SEO increased, meaning that SEO adversely affect plant diversity and species richness. Also, there was a negative association between the species richness and species evenness. This study concluded that arbitrary dumping of SEO is a threat to diversity of soil seeds bank. Seed germination on SEO polluted soils depends on contaminants concentration and the tolerant level of the plants. Therefore, SEO ≥ 10.00% affect germination, growth and diversity of soil seeds bank thereby making the soil bare and waterlog.
Authors and Affiliations
Oyinade Aderoju Dedeke and Gbenga Festus Akomolafe
Keywords
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