植物对PAHs污染土壤修复效果的种间差异研究

采用盆栽试验法,研究了黑麦草、苏丹草、油菜对土壤中菲、芘的去除效果,及植物和微生物去除土壤中菲、芘的交互效应。结果显示：菲、芘质量比约为80 mg.kg-1时,土壤-植物系统对菲、芘的去除效果明显。种植黑麦草、苏丹草、油菜60 d后,土壤菲、芘降解率分别为62.70%,76.25%,26.48%和47.80%,65.26%,23.56%,分别比无植物对照高39.69%,53.24%,3.47%和30.06%,47.48%,5.78%。本实验说明,植物可以促进微生物对土壤中菲、芘的降解,其中根系发达的苏丹草对微生物降解的促进作用最为显著。

The Differentiation of Plant Species in the Remediation of Soil Polluted by PAHs

In this study,pot experiments in greenhouse are processed to research the effects of ryegrass（Loliunmffultiflorum.L.）,Sudan grass（Sorghum vulgare L.）,cole（Brassica campestris L.） on the removal of phenanthrene and pyrene from soil,and the interaction between plants and microorganisms for pollutants removing efficiency.The results show that soil-grass system can significantly remove phenanthrene and pyrene from soil with varied pollutants concentrations（81.05 mg·kg-1 for phenanthrene and 79.86 mg·kg-1 for pyrene）.After 60 d planting of Ryegrass,Sudan grass and cole,the removal efficiencies of phenanthrene and pyrene are 62.70%,76.25%,26.48% and 47.80%,65.26%,23.56%,respectively.The removal efficiencies of the two pollutants are higher,39.69%,53.24%,3.47% and 30.06%,47.48%,5.78% in comparison with control group（without planted）.Planting Sundan grass is effective to greatly improving microbial degradation of pyrene and phenanthrene.Thus the interaction between plants and microorganisms is the main way for PAHs degradation in soil.