几种豆科、禾本科植物对多环芳烃复合污染土壤的修复

通过盆栽试验,研究了几种豆科植物与禾本科植物对多环芳烃(PAHs)复合污染土壤的修复作用。结果显示,90天后8种植物对土壤中PAHs均有不同程度降解效果,其中紫花苜蓿和多年生黑麦草对土壤PAHs的去除率分别达48.4%、46.8%,且对3环PAHs去除较为彻底,对4环及4环以上的PAHs去除效果较差。8种供试植物对PAHs均有一定的吸收、富集与转运的能力,紫花苜蓿和多年生黑麦草对土壤PAHs的生物富集系数分别为0.096、0.085,其提取修复效率为0.017%和0.013%。可见,紫花苜蓿和多年生黑麦草具有较好的根际修复潜力。

Remediation efficiency of several legumes and grasses in PAH-contaminated soils

Phytoremediation for soil PAHs with several legumes and grasses were investigated using a greenhouse study. The results indicated that eight plant species had different roles in PAHs degradation and removal in soil after 90 days. The removal rates of alfalfa and perennial ryegrass were 48.4% and 46.8%, respectively, and the biodegradation efficiency of 3-ring PAHs was high than those of 4-ring, 5-ring and 6-ring PAHs. The plant species showed different capability in PAHs uptake, accumulation and translocation from soils. Bioconcentration factors (BCFs) of alfalfa and perennial ryegrass were 0.096 and 0.085, but their phytoextraction rates were only 0.017% and 0.013%, respectively. So alfalfa and perennial ryegrassthe have good rhizoremediation potential in PAH-contaminated soil.