我国南方镭污染区优势植物及根际微生物分析OA北大核心CSTPCD

In order to explore the enrichment rule of 226Ra by dominant plants and characteristics of their rhizosphere microorganisms in medium-low level radium contaminated soil in southern China,a field quadrat survey was conducted on a typical uranium mining area in the subtropical humid monsoon climate region,dominant plants and soil were collected.Species dominance,the soil pollution level of radium,the plant transfer and bioaccumulation characteristics of 226Ra,and characteristics of plant rhizosphere microorganism were analyzed.The results showed that:a total 15 dominant herbs were screened,the biomass of Sorghum sudanense was the largest,the bio-concentration factor and translocation factor were 0.17 and 0.45,respectively.The average concentration of 226Ra was 211 Bq·kg-1 in soil.There were a large number of Proteobacteria,Ascomycota and other microorganisms in soil,and specific microbial groups were enriched in different plant rhizospheres,which has application potential in the treatment and remediation of radioactive environments,and the formation of combined plant-microbial remediation.The results could provide a basis for screening of combined plant-microbial remediation technologies for in-situ remediation of radioactive contaminated soil in the future.