| 苜蓿对多环芳烃菲污染土壤的修复作用研究 |
| 摘要点击 2255 全文点击 1468 投稿时间：2006-10-30 修订日期：2006-12-20 |
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| 中文关键词 苜蓿 植物修复 多环芳烃 菲 污染土壤 |
| 英文关键词 alfalfa(Medicago sativa L.) phytoremediation PAHs phenanthrene contaminated soil |
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| 中文摘要 |
| 采用盆栽试验方法，研究了苜蓿(Medicago sativa L.)对多环芳烃菲污染土壤的修复作用.结果表明，多环芳烃菲对苜蓿的生长具有抑制作用，土壤中菲初始浓度越高抑制作用越明显.445.22 mg/kg条件下苜蓿茎叶和根的生物量最小，仅为无污染对照土壤的57.31%和31.20%.经过60 d的修复试验，苜蓿能够明显促进土壤中菲的降解.根际和非根际土壤中菲的去除率分别为85.68%～91.40%和75.25%～86.61%.同处理中根际土壤中菲残留浓度低于非根际土壤，而脱氢酶活性高于非根际土壤.无论是在非根际还是根际土壤中随着菲初始浓度增大，菲降解率和脱氢酶活性降低.脱氢酶活性与降解率的关系表明，脱氢酶活性与菲降解率显著正相关.所以植物根系的存在能够有效促进土壤中多环芳烃菲的降解. |
| 英文摘要 |
| Pot experiment was used to investigate phytoremediation of phenanthrene-contaminated soil with alfalfa(Medicago sativa L.). Results indicated that phenanthrene had inhibitive effect on alfalfa growth, and higher phenanthrene concentration seriously prevent alfalfa growth. When the concentration was 445.22 mg/kg, the shoot and root biomasses were only 57.31% and 31.20% of control respectively. Alfalfa significantly promoted phenanthrene degradation in the soil. After 60 days, 85.68%～91.40% and 75.25%～86.61% of spiked phenanthrene disappeared from the rhizosphere and non-rhizosphere soils respectively. And the average removal ratio of phenanthrene in rhizosphere soils was 6.33% higher than that in non-rhizoshpere soils. The residual concentration of phenanthrene in the rhizosphere was lower than that in the non-rhizosphere but the dehydrogenase activity was on the contrary. With phenanthrene concentration increase the removal ratio and dehydrogenase activity decreased. A positive correlation was observed between the soil dehydrogenase activity and the removal ratio of phenanthrene in both the rhizosphere and non-rhizosphere soils. Therefore the presence of alfalfa roots was effective in promating the phytoremediation of phenanthrene. |
