Effects of Arbuscular Mycorrhizal Fungi （AMF） on Distribution of Pb Forms in Rhizosphere of Upland Rice

摘要

Abstract [Objective] The aim was to study the effects of AMF on distribution of Pb in different chemical forms in rhizosphere soil of upland rice. [Method] A pot experi- ment was conducted to explore effects of AMF inoculation on distribution of Pb in different forms in rhizosphere of rice （Oryzal sativa L.） with Pb in different concen- trations （0, 300 and 600 mg/kg）. [Resultl With inoculation adopted, mycorrzhial colo- nization rate of upland rice under Pb pdlution root declined substantially with Pb in- creasing in soils （P〈0.05）. Compared with non-inoculation, rhizosphere pH signifi- cantly enhanced by inoculation; when Pb was at 300 mg/kg, glomalin content in soils improved significantly by inoculation; when Pb was at 600 mg/kg, glomalin con- tent in soils declined substantially （P〈0.05）. In addition, inoculation significantly im- proved contents of Pb in exchangeable and organic forms, but lowered Pb in car- bonate bound and Fe-Mn oxides bound forms （P〈0.05）. [Conclusion] The research indicated that AMF inoculation would change distribution of Pb in different forms in rhizesphere soils of upland rice.