Abstract:

In order to study the effects of arbuscular mycorrhizal fungi on the soil Pb distributional pattern in the upland rice (Oryzal sativa L.) rhizosphere, pot culture was conducted to investigate the effects of AMF-Glomus mosseae on the change of Pb forms under different Pb levels including 0, 300, 600 mg/kg soil. The results indicated that, the root colonization and hyphae length decreased by the root colonization of Glomus mosseae with increasing of soil Pb concentration. Compared with non-mycorrhizal plants, the mycorrhizal colonization increased rhizospheric soil pH under both Pb treatments. The mycorrhizal colonization enhanced the soil gomalin concentration under 300 mg/kg soil Pb treatments, yet it decreased under 600 mg/kg soil Pb treatments. In rhizosphere of AM upland rice, exchangeable Pb and the amounts of Pb bound to organic matter increased significantly yet the amounts of Pb bound to carbonates and to iron and manganese oxides decreased significantly compared with that of non-mycorrhizal plants. It suggested that, the soil Pb distribution pattern in the upland rice rhizosphere could be changed by the colonization of Glomus mosseae.