丛枝菌根作用下土壤中多环芳烃的残留及形态研究

采用盆栽试验方法,以苊为多环芳烃(PAHs)代表物,研究了丛枝菌根(AM)作用下土壤中 PAHs 的残留及形态.供试污染土壤中苊的起始浓度为 35.0 mg/kg.结果表明,AM作用下土壤中苊总残留量明显降低;接种摩西球囊霉菌Glomus mosseae或幼套球囊霉菌Glomus etunicatum后,供试两个污染土样中苊总残留降解率达32.7%～45.2%,比未接种对照高 6.8%～9.8%.有机溶剂提取态是土壤中苊残留的主要部分,AM 作用促进了苊各形态之间的转化;接种AM后土壤 1、2 中苊可脱附态和有机溶剂提取态残留量分别比对照降低了17.0%～37.8% 和 5.4%～26.6%,而结合态残留量比对照增加了12.2%～89.5%.AM 作用能降低土壤中苊可提取态残留含量;但培养55 天后土壤中仍有 65.7%～81.7% 苊属于可提取态残留,对生物有毒害风险.

Effects of arbuscular mycorrhiza (AM) on residual and forms of polycyclic aromatic hydrocarbons in soils

Pot experiment was conducted with a series of treatments of soils in a greenhouse to investigate the effects of arbuscular mycorrhiza (AM) on the residual forms of PAHs in soils.The initial concentrations of acenaphthene in soils were 35.0 mg/kg.It has been found that AM significantly reduced acenaphthene content in soils.The degradation rates of acenaphthene in soils with inoculation of Glomus mosseae and Glomus etunicatum were 32.7% - 45.2%,increased by 6.8% - 9.8% than the control (without AM).The non-de...