施肥对苏丹草修复石油污染土壤的影响

采用盆栽试验,研究了苏丹草修复石油污染土壤的效果,在有、无氮磷钾肥的条件下,对苏丹草的生长发育和石油的组分进行了分析。结果表明,经过90 d的修复,施肥处理的石油烃去除率比无施肥处理的对照高10.31%;苏丹草的株高、地上干重和地下干重也得到了显著提高,而叶绿素a/b和叶绿素a/类胡萝卜素均有所降低;芳烃(16种多环芳烃)的去除率和烷烃(C8~C40)的去除率分别提高了7.39%和6.44%。不论是对照还是施肥处理,烷烃的去除效果均优于芳烃。

Effect of fertilization on remediation of petroleum contaminated soil by Sudangrass

In the present study, the effect of fertilization on the remediation of petroleum contaminated soil by Sudangrass was investigated in a pot experiment. Growth of Sudangrass and removal and components of petroleum hydrocarbons were examined. Results showed that growing Sudangrass significantly decreased petroleum hydrocarbon content in the soil. After 90 day of the experiment, the removal rate of petroleum hydrocarbons was 10.31% greater under fertilization(up to 54.20%) than under the un-fertilized control. Fertilization also promoted the growth of Sudangrass. The shoot height(up to 23.07 cm), shoot dry weight(up to 0.45 g), and root dry weight(up to 0.08 g) of Sudangrass under fertilization were all significantly higher than those under the un-fertilized control. The removal rates of aromatic hydrocarbons(16 PAHs, up to 21.35%) and alkanes(C8~C40, up to 51.94%) were respectively 7.39% and 6.44% greater under fertilized conditions than under the control. Significant differences were observed in the removal rates between alkanes and aromatic hydrocarbons. The removal efficiencies of alkanes were greater than those of aromatic hydrocarbons under both fertilized and control conditions. Phenanthrene, pyrene and benzoa] anthracene were the main components of the aromatic hydrocarbons, representing more than 80% of the total aromatic hydrocarbons in the soil. Our results demonstrate that fertilization could promote the remediation of petroleum contaminated soil by Sudangrass.