Abstract
An experimental study of the rhizosphere effect on phytoremediation of petroleum polluted soil was carried out with three species of grasses, namely Pannicum, Eleusine indica (L.) Gaerth, and Tall Fescue. After a period of 150 days, this pot experiment showed that the rhizosphere of these three species accelerated the degradation of petroleum hydrocarbons to different extents. The results showed that the number of microorganisms in the rhizosphere increased by three orders of magnitude. The induction of the plant rhizosphere and the coercion influence of petroleum changed the species and activity of microorganisms. The degradation of petroleum hydrocarbons in the rhizosphere was 3–4 times that in unplanted soil. The dehydrogenase activity in the rhizosphere was 1.61–2.20 times that in unplanted soil, but the catalase activity was 0.90–0.93 times that in unplanted soil, and soil moisture content increased by 5% compared with the unplanted soil.
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