水稻田垂直剖面土壤稀土元素来源解析及生态风险评价——基于锶钕同位素示踪结合MixSIAR模型  

Source apportionment and ecological risk assessment of rare earth elements in vertical profiles of paddy soils—Based on Strontium and neodymium isotope tracing combined with MixSIAR model

作　　者：曹劼 闫钰 于瑞莲[1] 翁铂森 胡恭任[1,2] 崔建勇 颜妍[3] 黄华斌 CAO Jie;YAN Yu;YU Rui-lian;WEN Bo-sen;HU Gong-ren;CUI Jian-yong;YAN Yan;HUANG Hua-bin(Department of Environmental Science and Engineering,Huaqiao University,Xiamen 361021,China;Key Laboratory of Fujian Universities for Environmental Monitoring,Xiamen 361021,China;Center of Analysis,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]华侨大学环境科学与工程系,福建厦门361021 [2]环境监测福建省高校重点实验室,福建厦门361021 [3]核工业北京地质研究院分析测试研究中心,北京100029

出　　处：《中国环境科学》2023年第6期3002-3012,共11页China Environmental Science

基　　金：福建省自然科学基金资助项目(2022J01313)。

摘　　要：为研究水稻田垂直剖面土壤中稀土元素的来源及生态风险,采集了福建省东南部地区3个水稻田垂直剖面土壤及周边潜在源样品,分析测定垂直剖面土壤和潜在源中稀土元素含量及锶钕同位素组成.在垂直剖面土壤和潜在源稀土元素含量、地球化学特征定性分析垂直剖面土壤中稀土元素来源的基础上,利用锶钕同位素结合MixSIAR模型定量计算各潜在源对垂直剖面土壤中稀土元素的具体贡献,将潜在生态风险评价与MixSIAR模型计算贡献率结果相结合,得出潜在源对垂直剖面土壤中稀土元素综合潜在生态风险的贡献.结果表明,P1垂直剖面土壤中稀土元素主要来源于土壤母质层,稀土元素达到中等生态风险水平;P2垂直剖面土壤中稀土元素受化肥影响较大,浅层土壤中稀土元素生态风险大于深层土壤;P3垂直剖面土壤中稀土元素受多种因素综合影响,稀土元素生态风险较小.垂直剖面土壤中稀土元素生态风险受人为因素影响的同时自然来源也不可忽视.To investigate the sources and ecological risks of rare earth elements in vertical profiles of paddy soils,soil samples from three vertical profiles of paddy soils in southeastern Fujian Province and the surrounding potential sources were collected,and the rare earth element contents and strontium-neodymium isotopic compositions in these samples were determined.The source identification was firstly performed based on rare earth element contents and geochemical characteristics of vertical profile soils and potential sources.The source contribution was then quantified by using strontium-neodymium isotopes in combination with the MixSIAR model.Finally,the contribution of potential sources to the integrated potential ecological risks of rare earth elements in the vertical profile soils were evaluated by the combined results of ecological risk assessment and MixSIAR model.The results showed that rare earth elements in the P1 vertical profile soils were mainly originated from the soil parent material,and rare earth elements reached the medium ecological risk level.Rare earth elements in the P2 vertical profile soils were influenced by chemical fertilizers,and the ecological risks of rare earth elements in the shallow soil were greater than those in the deep soil.Rare earth elements in the P3 vertical profile soils were influenced by combination factors,and the ecological risks of rare earth elements were smaller.The ecological risks of rare earth elements in vertical profile soils were influenced by human factors while natural sources cannot be ignored.

关 键 词：锶钕同位素 MixSIAR模型 稀土元素 垂直剖面土壤 生态风险 

分 类 号：X53[环境科学与工程—环境工程]