Cofield Naressa, Schwab A Paul, Banks M Katherine
School of Civil Engineering, Purdue University, Lafayette, Indiana 47907, USA.
Int J Phytoremediation. 2007 Sep-Oct;9(5):355-70. doi: 10.1080/15226510701603858.
Phytoremediation has been demonstrated to be a viable cleanup alternative for soils contaminated with petroleum products. This study evaluated the application of phytoremediation to soil from a manufactured gas plant (MGP) site with high concentrations of recalcitrant, polycyclic aromatic hydrocarbons (PAHs). Two greenhouse studies investigated the potential dissipation and plant translocation of PAHs by fescue (Festuca arundinacea) and switchgrass (Panicum virgatum) in the first experiment and zucchini (Curcubita pepo Raven) in the second. The MGP soil was highly hydrophobic and initially inhibited plant growth. Two unplanted controls were established with and without fertilization. In the first experiment, concentrations of PAHs decreased significantly in all treatments after 12 mo. Plant biomass and microbial numbers were statistically equivalent among plant species. PAH concentrations in plant biomass were negligible for fescue and switchgrass. In the second experiment, zucchini enhanced the dissipation of several PAHs after 90 d of treatment when compared to the unvegetated soil. Plant tissue concentrations of PAHs were not elevated in the zucchini roots and shoots, and PAHs were not detectable in the fruit.
植物修复已被证明是一种可行的清理受石油产品污染土壤的替代方法。本研究评估了植物修复在一个含有高浓度难降解多环芳烃（PAHs）的人工煤气厂（MGP）场地土壤中的应用。两项温室研究在第一个实验中调查了羊茅（Festuca arundinacea）和柳枝稷（Panicum virgatum）对PAHs的潜在降解和植物转运情况，在第二个实验中调查了西葫芦（Curcubita pepo Raven）对PAHs的潜在降解和植物转运情况。MGP场地的土壤具有高度疏水性，最初抑制了植物生长。设置了两个未种植的对照，一个施肥，一个不施肥。在第一个实验中，12个月后所有处理中PAHs的浓度均显著下降。植物生物量和微生物数量在不同植物物种间在统计学上相当。羊茅和柳枝稷植物生物量中的PAH浓度可忽略不计。在第二个实验中，与未种植植物的土壤相比，西葫芦在处理90天后促进了几种PAHs的降解。西葫芦的根和茎中PAHs的植物组织浓度没有升高，果实中也未检测到PAHs。
