Rare earth elements including samarium have been widely used in modern technologies in recent decades. Following over-exploitation and soil contamination, they can accumulate in plants and be toxic at high concentrations. Arbuscular mycorrhizae benefit plants in metal-contaminated soils by improving their survival and growth and alleviating metal toxicity, but little information is available about soil contaminated by rare earth elements. We performed two experiments using samarium to study the role of arbuscular mycorrhizal fungi on plant growth and samarium transfer to alfalfa in a samarium-spiked soil. A pot experiment was conducted in a soil spiked with two concentrations of samarium and a non-spiked control, inoculated or not with a metal-tolerant Funneliformis mosseae. A compartmented pot experiment was then performed with a separated compartment containing samarium-spiked sand only accessible by F. mosseae fungal hyphae to further study the transport of samarium from the soil to alfalfa. The biomass of alfalfa grown on samarium-spiked soil was reduced, while it was significantly higher following arbuscular mycorrhiza inoculation in the pot experiment, both in the control and samarium-spiked soil. Although mycorrhizal plants had a higher phosphorus content than non-mycorrhizal ones, there was no significant difference in samarium concentrations between mycorrhizal and non-mycorrhizal plants. The compartment experiment confirmed that there was no significant samarium transfer to the plant by F. mosseae. Other fungi and plants should be tested, and field experiments performed, but our results suggest that arbuscular mycorrhizal plants might be considered in phytorestoration of rare-earth-contaminated soils.

近几十年来，包括sa在内的稀土元素已广泛用于现代技术中。在过度开发和土壤污染之后，它们会积聚在植物中，并在高浓度时有毒。丛枝菌根通过提高植物的存活率和生长并减轻金属毒性而使植物在金属污染的土壤中受益，但有关稀土元素污染的土壤的信息很少。我们使用sa进行了两个实验，以研究丛枝菌根真菌对掺growth土壤中植物的生长以及transfer向苜蓿的转移的作用。盆栽试验是在掺有两种sa的浓度和未掺入对照的土壤中进行的，无论是否接种了耐金属的Funneliformis mosseae。然后，用一个分离的隔间进行了一个盆栽试验，该隔间包含只有F苔真菌真菌菌丝才能进入的掺mar沙子，进一步研究了from从土壤到苜蓿的运输。在盆栽试验中，无论是对照还是掺mar土壤，苜蓿在掺mar土壤上生长的苜蓿的生物量都减少了，而丛枝菌根接种后，苜蓿的生物量却明显更高。尽管菌根植物的磷含量高于非菌根植物，但在菌根植物和非菌根植物之间sa浓度没有显着差异。隔室实验证实，F。mosseae没有明显的sa转移到植物中。其他真菌和植物应进行测试，并进行田间试验，但我们的结果表明，在稀土污染土壤的植物贮藏中可考虑使用丛枝菌根植物。