江西赣州瑞金-石城地区土壤与白莲果实中Se及其他有益元素地球化学特征

The geochemical characteristics of selenium and other beneficial elements in soil and white lotus in Ruijin-Shicheng,Ganzhou City,Jiangxi Province

为了配合赣州六县脱贫攻坚15万土地质量地球化学调查工作,选择江西瑞金和石城采集了表层土壤及70件白莲-根系土样品,测定了土壤和白莲果实中Se等23项元素指标,包括有益人体健康的10项微量元素。调查结果表明:①石城县白莲中Cd、Pb、Cr、Hg和As五种重金属均低于GB2762—2017标准中限量值,瑞金市白莲中除有36%Pb超标现象外,其他重金属都不超标。其对应根系土中5种重金属含量低于筛选值,瑞金—石城表层土壤是绿色安全的,并分别圈定了绿色富硒基地2块,面积分别为瑞金92 km^2和石城5.6 km^2;②瑞金—石城白莲富硒率较高,达80%以上,并富含人体所需的10项微量元素,这将为开发富硒白莲提供技术支撑;③在非富硒土壤中发现了富硒白莲,可能主要与土壤中硒的生物有效性和白莲自身特性有关。

In order to cooperate with the 150000 geochemical survey of land quality in six counties of Ganzhou,the authors selected Ruijin and Shicheng survey areas.Surface soils,70 sets of white lotus and root soil were collected in the whole area.Twenty three elements in lotus and root soil,including 10 trace elements beneficial to human health,were determined.The content,correlation and geological background of selenium and other beneficial elements in the fruit and root soil of white lotus were analyzed.The survey results are as follows:①The values of Cd,Pb,Cr,Hg and As in white lotus of Shicheng County are lower than the limit value in GB2762-2017 standard.Except for 36%Pb exceeding the standard,other heavy metals in white lotus in Ruijin do not exceed the standard.The content of five heavy metals in the corresponding root soil is lower than the screening value,and the surface soil of Ruijin Shicheng survey areas is green and safe.Two green selenium rich bases were delineated,with an area of 92 km^2 in Ruijin and 5.6 km^2 in Shicheng.②White lotus produced in Ruijin-Shicheng survey areas is rich in selenium,which is more than 80%,and is rich in 10 kinds of trace elements needed by human body,which will provide technical support for the development of selenium rich white lotus.③Selenium rich white lotus was found in non-selenium rich soil,which may be related to the biological availability of selenium in soil and its own characteristics.