Abstract

The impact of crude oil spill on the number of plant species and the above-ground live standing crop biomass (AGLSCB) of a herbaceous plant community was assessed. The spillage had a devastating effect on the herbaceous community and especially on the component herbaceous annuals. At least 80–90% of the species were absent in the affected areas in comparison to nearby unaffected areas, most of these being annuals. Perennial species were generally less affected. The total herbaceous production for a period of 12 months in the polluted areas was 885.1 gm−2 compared with 4860.7 gm−2 for the unaffected areas. The average monthly production in the polluted areas was 73.8 gm−2 compared with 405.0 gm−2 for the unaffected areas.

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