【摘要】 用3.0和25.0 kGy剂量的60Coγ射线分别对供试土壤进行了辐照处理,以区分土壤中的内生菌根菌和其他土壤微生物;并以未经辐照处理的土壤为对照研究了土壤微生物对黑麦草和百喜草吸收89Sr的影响。结果表明:在对照土壤中黑麦草和百喜草根部内生菌根的侵染率分别为48.0%和28.0%,说明两种草均易与内生菌根菌形成内生菌根。尽管内生菌根菌和其他土壤微生物对黑麦草和百喜草的地上部分生物量没有明显影响,但它们都不同程度地降低了两种草对89Sr的吸收。更多还原

【Abstract】 In present study,⁶⁰Co γ-rays was used to irradiate soil with doses of 3.0 kGy and 25.0 kGy,respectively,to discriminate between arbuscular mycorrhizal （AM） fungi and other soil microorganisms,while soil without irradiation was used as control to study the effects of soil microorganisms on uptake of ⁸⁹Sr by ryegrass and bahia grass.The results showed that the AM infection rates in ryegrass and bahia grass were 48.0 % and 28.0% in the control soil,respectively which indicated that both grass species were prone to forming AM symbiosis with AM fungi.Although AM fungi and other soil microorganisms had no significant effect on above ground biomass in ryegrass and bahia grass,both AM fungi and other soil microorganisms decreased the uptake of（）⁸⁹Sr in the two grass species,though to a more or less extant.更多还原