| 多氯联苯污染土壤的豆科-禾本科植物田间修复效应 |
| 摘要点击 2464 全文点击 1616 投稿时间：2009-12-31 修订日期：2010-03-22 |
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| 中文关键词 多氯联苯 紫花苜蓿 黑麦草 高羊茅 植物修复 |
| 英文关键词 polychlorinated biphenyls(PCBs) alfalfa ryegrass tall fescue phytoremediation |
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| 中文摘要 |
| 选择豆科植物紫花苜蓿、禾本科植物黑麦草和高羊茅作为供试植物，初步探讨了这3种植物在单作和间作条件下对多氯联苯污染土壤的田间修复效应.结果表明，经过270 d的田间原位修复后，所有种植植物的处理中土壤多氯联苯的去除率均高于对照组，其中紫花苜蓿单作处理土壤中多氯联苯的去除率最高，达到59.6%.土壤多氯联苯同系物分析结果表明，所有种植植物的处理都降低了土壤中二氯联苯的比例.3种植物中紫花苜蓿的生物量最大，其根部积累的多氯联苯含量最高可达355.1 μg/kg，显著高于黑麦草和高羊茅根中的含量.各处理对土壤中多氯联苯的提取修复效率依次为：紫花苜蓿单作＞紫花苜蓿-黑麦草-高羊茅间作＞紫花苜蓿-黑麦草间作＞黑麦草单作＞紫花苜蓿-高羊茅间作＞高羊茅单作.豆科植物紫花苜蓿是多氯联苯污染土壤田间原位修复的理想材料. |
| 英文摘要 |
| Phytoremediation of polychlorinated biphenyls(PCBs) contaminated soil by leguminosae (alfalfa) and gramineae (ryegrass and tall fescue) was studied in a field trial. All planted treatments had significantly higher PCBs removal efficiency compared with those of unplanted control after 270 days of in-situ phytoremediation.Alfalfa monoculture received the highest removal efficiency of soil PCBs by 59.6%.Analysis of PCBs congeners composition showed that the percentage of di-chlorinated biphenyl decreased in all planted treatments.Alfalfa produced the maximum biomass among the 3 plants.Total PCBs concentration in alfalfa roots reached 355.1 μg/kg,which was significantly higher than those in ryegrass and tall fescue. The phytoextraction efficiency of different treatment was in order of alfalfa＞alfalfa-ryegrass-tall fescue＞alfalfa-ryegrass＞ryegrass＞alfalfa-tall fescue＞tall fescue. The results suggest that alfalfa may be an ideal candidate for the phytoremediation of PCBs contaminated soil. |
