广玉兰对柴油污染土壤中多环芳烃的修复作用研究

PAHs Dissipation in a Diesel-oil-contaminated Soil under Tree Species—Magnolia grandiflora

利用盆栽试验方法,在3个多环芳烃污染水平(重度L3)、(中度L2)、(轻度L1)下,研究了广玉兰(Magnoliagrandiflora)对柴油污染土壤中多环芳烃的修复作用。结果表明:(1)植物存在能有效提高PAHs的降解率,特别是促进高环组分的降解;(2)植物存在能显著提高土壤微生物的数量,且植物种植对放线菌的影响最大,真菌次之,细菌最小;(3)植物-微生物间的交互作用、微生物降解是植物-土壤系统修复PAHs污染的主要途径。

While trees have demonstrated potential in phytoremediation of several organic contaminants,little is known regarding their ability to impact the common soil contaminant PAHs.In our study,one tree species-Magnolia grandiflora from subtropical China was elected and planted separatedly in the pots in which soils were treated with diesel oil to three concentration levels of PAHs（L1﹤L2﹤L3）.Soil PAHS dissipation and microbial numbers were monitored after a 180-day-cultivation period.The results showed that plants improved PAH sdissipation successfully,obviously did high weight PAHS.Planting was found to increase soil microbes amount,and meanwhile the actinomyce were most impacted,the fungi were more and the bacterial were least by planting.Extensive and rapid loss of PAHS was mainly attributed to microbial activity.