为探索我国南方中低水平镭污染土壤环境中优势植物对 226Ra的富集规律及其根际微生物特征,对属于中亚热带湿润型季风气候区的南方典型铀矿区进行了野外实地样方调查,采集该地区优势植物和土壤,分析物种优势度、土壤镭污染水平、植物对 226Ra的转移和富集特征、植物根际微生物特征.结果表明,现场共筛选出15种优势草本植物,以苏丹草(Sorghum sudanense)的生物量最大,富集系数和转运系数分别为 0.17、0.45;采样区 226Ra的平均浓度为 211 Bq·kg-1;土壤中存在大量的变形菌门(Proteobacteria)、子囊菌门(Ascomycota)等微生物,且不同的植物根际有特定的微生物类群富集,在放射性环境治理和修复、形成植物-微生物联合修复组合方面具有应用潜力.本研究结果为后期筛选原位治理土壤放射性污染的植物-微生物联合修复技术提供了依据.
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.
原寒;乔新燕;曹少飞;吴仁杰;李建国;商照荣
中国辐射防护研究院,中核集团核环境模拟与评价技术重点实验室,山西 太原 030006中国原子能科学研究院,北京 102413生态环境部核与辐射安全中心,北京 100082
镭;超富集植物;转移参数;根际微生物
radium;hyperaccumulator;transfer parameters;rhizosphere microorganism
《核农学报》 2024 (006)
1146-1152 / 7
国家重点研发计划(2020YFC1806603)
10.11869/j.issn.1000-8551.2024.06.1146
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