| 多氯联苯污染土壤菌根真菌-紫花苜蓿-根瘤菌联合修复效应 |
| 摘要点击 1823 全文点击 1020 投稿时间：2007-11-12 修订日期：2008-01-14 |
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| 中文关键词 多氯联苯 紫花苜蓿 菌根真菌 苜蓿根瘤菌 联合修复 |
| 英文关键词 polychlorinated biphenyls alfalfa arbuscular mycorrhizal fungus(AM) Rhizobium meliloti combined remediation |
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| 中文摘要 |
| 选用紫花苜蓿（Medicago sativa L.）作为宿主植物，盆栽试验研究了丛枝菌根真菌（Glomus caledonium）和苜蓿根瘤菌(Rhizobium meliloti)单接种及双接种对PCBs复合污染土壤的联合修复效应.结果表明，在紫花苜蓿-菌根真菌-根瘤菌共生体系中，紫花苜蓿对土壤中PCBs的降低起到明显作用，使轻度污染和重度污染土壤中PCBs浓度分别下降了15.8%、 23.5%，紫花苜蓿单接种菌根真菌和苜蓿根瘤菌后轻度污染和重度污染土壤中PCBs浓度分别下降了14.8％、 24.1%和20.6%、 25.5%，双接种后土壤PCBs分别降低了23.2％、26.9%，而且也改变了紫花苜蓿根际土壤微生物群落的碳源利用程度，改善了微生物群落功能多样性.可见，紫花苜蓿豆科植物-菌根真菌-根瘤菌特殊共生体对PCBs污染土壤显示了较好的修复潜力. |
| 英文摘要 |
| The combined remediation effects of dual inoculation with an arbuscular mycorrhizal fungus (AM) and rhizobium (Rhizobium meliloti) with a host plant (alfalfa) on PCBs contaminated soils was studied using pot experiments.The results showed that alfalfa had a clear role in PCBs removal in soils compared with treatments without alfalfa and inoculated microorganisms，PCBs concentration in lightly and heavily polluted soils decreased 15.8% and 23.5%，respectively.After planting alfalfa with single incubation of Glomus caledonium，PCBs concentration decreased 14.8％and 24.1% from lightly and heavily polluted soils，decreased 20.6% and 25.5% for single incubation of Rhizobium meliloti，respectively.After dual incubation with Glomus caledonium and Rhizobium meliloti，PCBs concentration in lightly and heavily polluted soils decreased 23.2％ and 26.9%.We also observed that soil microbial communities in alfalfa rhizosphere soils had a higher carbon utilization rate，improving the functional diversity of the soil microbial community.The results suggest that dual incubation of Glomus caledonium and Rhizobium meliloti has great potential in remediation of PCBs contaminated soils. |
