垫土法植物修复石油污染土壤的试验研究

Experimental Study on Phytoremediation of Oil-Contaminated Soil Using Filling Soil Method

进行了紫花苜蓿、白三叶、黑麦草和苇状羊茅在不同浓度石油污染土壤中的存活率实验、石油降解实验和在水培养条件下的根部生长观察实验,并采用垫土法对高浓度石油污染土壤进行了120d的植物修复实验。结果表明,禾本类植物黑麦草和苇状羊茅比豆科类植物紫花苜蓿和白三叶更适于石油污染土壤的修复;垫土法可使植物种子发芽生根,增强了植物对石油污染的抗胁迫能力,但植物产生了大量高毒性的芳烃代谢产物,对根际微生物产生毒害,因而芳烃组分降解效率低;禾本类植物明显优于豆科类植物,在一定程度上更适合修复高浓度石油污染土壤。

In this paper, the survival test and oil-degradation test of alfalfa, white clover, ryegrass and tall rescue in different concentrations of oil-contaminated soil were carried out, and the root growth under water condition was also observed. Filling soil method was used to treat high concentration of oil-contaminated soil in 120 days of phytoremediation. The results showed that,ryegrass and tall rescue of gramineae were much better than alfalfa and white clover of leguminosae in application of remediation of oil-contaminated soil; filling soil method could make the tested plants germination root and increase the resistance to oil pollution,but plenty of highly toxic aromatic metabolites were produced,while there was a lack of microorganisms that degraded them, so the degradation efficiency of aromatic components was low. In a word, the gramineae plants were superior to the leguminosae plants obviously and suitable for remediation of high concentration of oil-contaminated soil to some extent.