摘要
采用盆栽试验方法,研究了黑麦草(LoliummultiflorumLam)对土壤中菲和芘的修复作用。供试污染土壤中菲和芘的起始浓度分别为0￣456.5和0￣488.7mg·kg-1。结果表明,黑麦草可明显促进土壤中菲和芘的降解。45d后,种植黑麦草的土壤中菲和芘的去除率分别为85.80%￣90.79%和44.32%￣89.21%,均显著高于无植物对照;而残留浓度则比对照约低53.6%和78.3%。修复过程中,尽管黑麦草本身可吸收积累菲和芘,且根和茎叶中菲和芘的含量均随土壤中菲和芘浓度的提高而明显增大,但植物吸收积累并不是黑麦草促进土壤中菲和芘降解的主要原因,其贡献小于0.54%;与微生物对照相比,植物修复效率明显提高,主要是植物促进了土著微生物对土壤中菲和芘的降解作用。
The prospect of using vegetation to enhance the degradation of organic contaminants such as PAHs in soil systems is an attractive cost-effective alternative to traditional engineering approaches. The principle contributions of plants to phytoremediation are either stimulation of soil microbial activity and degradation of contaminants, or plant direct uptake and accumulation of the PAHs. However, information is scant on plant uptake of these chemicals from soils. As a consequence, there are difficulties to evaluate the plant contribution to phytoremediation process. Thus, the mechanisms of phytoremediation for soil PAH pollutants were elucidated in this study based on investigation of plant uptake of these chemicals in soils. Phytoremediation for soil phenanthrene and pyrene with ryegrass (Lolium multiflorum Lam) was investigated using a greenhouse study. The initial concentrations of phenanthrene and pyrene in soils were in a range of 0~456.5 and 0~488.7 mg·kg-1, respectively. It has been found that ryegrass significantly promoted the degradation of these PAHs in the soils. At the end of the experiment after 45 days, about 85.80%~90.79% and 44.32%~89.21% of added respective phenanthrene and pyrene were disappeared from soils with ryegrass, which were higher than those in unplanted control soils. While the residual concentrations of phenanthrene and pyrene in the soils were in a range of 53.6% and 78.3%, lower than those in unplanted soils. Although uptake and accumulation of these PAHs by ryegrass were obvious, and the root or shoot concentrations monotonically increased with the increase of the soil PAH concentrations, plant off-take only accounted for less than 0.54% of dissipation enhancement for phenanthrene and pyrene in planted versus unplanted control soils, whereas plant-promoting biodegradation was the predominant contribution of remediation enhancement of these soil PAHs in the presence of ryegrass.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2005年第3期498-502,共5页
Journal of Agro-Environment Science
基金
国家杰出青年科学基金(20125719)
国家自然科学基金重点项目(20330710)
关键词
植物修复
多环芳烃
土壤
植物吸收
phytoremediation
polycyclic aromatic hydrocarbons (PAHs)
soil
plant uptake
