南渡河流域农田土壤-水稻系统硒与镉富集特征及其相互关系  

Enrichment characteristics of selenium and cadmium in farmland soil-rice system and their relationships in the Nandu River basin

作　　者：沈琳丽 罗松英 梁志鹏 梁晓琪 林千策 SHEN Lin-li;LUO Song-ying;LIANG Zhi-peng;LIANG Xiao-qi;LIN Qian-ce(School of Geographical Sciences,Lingnan Normal University,Zhanjiang 524048,Guangdong,China;School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 528478,Guangdong,China)

机构地区：[1]岭南师范学院地理科学学院,广东湛江524048 [2]中山大学地球科学与工程学院,广东珠海528478

出　　处：《湖北农业科学》2024年第9期22-27,共6页Hubei Agricultural Sciences

基　　金：广东省湛江市海洋青年人才创新项目(2021E05018);岭南师范学院燕岭优青教师培训计划项目(YL20200209);岭南师范学院红树林研究院开放课题(YBXM03);岭南师范学院大学生创新创业训练计划项目(X202210579023)。

摘　　要：测定南渡河流域农田表土和水稻共80份样品的硒(Se)和镉(Cd)含量,采用生物富集系数分析土壤-水稻系统中Se与Cd的富集特征,并结合Pearson系数分析表土与稻米Se含量、Cd含量、pH以及有机碳含量的相互关系。结果表明,研究区农田土壤达到了足硒-富硒标准,且有40%稻米样品达到富Se大米标准;土壤中Cd含量均未超出国家农用地土壤污染风险筛选值(0.300 mg/kg),稻米Cd含量均小于食品安全国家标准限值(0.200 mg/kg),未发现有Cd污染。研究区土壤-水稻系统中Se含量呈正态分布,有明显的分段现象;Cd含量受外源干扰强,空间分布较不均衡。Se与Cd在水稻中都达到中等富集,其中稻米对Cd的富集能力强于对Se的富集能力。研究区的富Se土壤与当地酸性土壤环境以及高有机碳含量有着密切联系。综上,南渡河流域农田土壤Se资源丰富,不存在“富硒镉米”现象,可加以开发利用生产绿色富Se农产品。Selenium(Se)and Cadmium(Cd)contents in 80 samples of farmland topsoil and rice in the Nandu River basin were deter-mined.The enrichment characteristics of Se and Cd in the soil-rice system were analyzed using bioenrichment coefficients,and the in-terrelationships among Se content,Cd content,pH value and organic carbon content of topsoil and rice were analyzed using Pearson coefficient analysis.The results showed that,the farmland soil of the study area met the standards for sufficient and rich selenium,and 40%of the rice samples met the Se rich rice standard.The Cd content in the soil did not exceed the national agricultural land pollution risk screening value(0.300 mg/kg),and the Cd content in rice was less than the national food safety standard value(0.200 mg/kg),indicating no Cd pollution in the study area.The Se content in the soil-rice system in the study area showed a normal distribution,with an obvious segmentation phenomenon.Cd content was strongly influenced by external interference and was unevenly distributed in space.Both Se and Cd elements were moderately enriched in rice,with rice having a stronger ability to enrich Cd than Se.The Se rich soil in the study area was closely related to the local acidic soil environment and high organic carbon content.In summary,the farm-land soil Se resources in the Nandu River basin were abundant,and there was no phenomenon of“se-rice and cd-unpvlluted rice”.It could be developed and utilized to produce green Se rich agricultural products.

关 键 词：土壤-水稻系统 硒 镉 富集特征 原子荧光光谱仪(AFS) 电感耦合等离子体质谱仪(ICP-MS) 南渡河流域 

分 类 号：P595[天文地球—地球化学] X503.231[天文地球—地质学]