岩石-土壤-脐橙系统中稀土元素迁聚特征  

Characteristics of migration and accumulation of rare earth elements in the rock-soil-navel orange system

作　　者：汪振立[1] 邓通德[1] 王瑞敏[2] 邵文军[2] 徐明[1] 廖万琪 

机构地区：[1]江西应用技术职业学院,江西赣州341000 [2]国土资源部沈阳矿产资源监督检测中心,辽宁沈阳110032 [3]赣州市农业局,江西赣州341000

出　　处：《中国地质》2009年第6期1382-1394,共13页Geology in China

基　　金：江西省农业攻关重点项目(见赣科发计字[2006]38号<关于2006年部门预算内省直部门科技计划项目及经费安排的通知>)资助

摘　　要：在赣南稀土高背景区和稀土低背景区不同地质环境脐橙果园,系统采集岩、土、脐橙植物样,用ICP-MS法测定样品中15种稀土元素的含量,并对稀土元素在岩石、土壤和脐橙植物体内的分布、迁移、累积特征进行了研究。结果表明a.基岩的稀土元素含量影响(决定)土壤各层位的稀土元素含量;b.土壤环境中稀土元素含量高低直接影响脐橙植物体稀土元素含量,但不完全成正比;c.基岩的稀土元素配分模式基本上贯穿土壤各层位、脐橙植物体各器官;d.岩、土、脐橙三大环节稀土元素的百分含量,总的趋势是轻稀土比重逐渐增高,重稀土比重逐渐降低,但重稀土在脐橙植物体末稍器官比例有所增加;e.岩土脐橙生态系统立体剖面中,稀土元素的垂直方向运动呈向量关系;f.由于土壤-植物壁垒作用和脐橙植物体自身的选择性吸收、控制性积累功能,高、低稀土背景区脐橙果肉的稀土含量均低于国家食品卫生限量标准。Samples of rocks,soils and navel orange trees were taken systematically in several orchards located in different geological conditions characterized by rich or poor REE in southern Jiangxi Province.The contents of 15 rare earth elements in these samples were measured by using the method of ICP-MS,and the distribution,migration and accumulation of REE in rocks,soils and navel orange plants were studied.Some conclusions have been reached：a.The content of REE in the bedrock affects or decides the content of REE in all layers;b.The content of REE in soil directly affects the content of REE in navel orange plants;nevertheless,they are sometimes not in a direct proportion with each other;c.The distribution pattern of REE in bedrock seems to be the same in every layer of the soil and in all organs of the navel orange plants;d.General trend of the percentage content of REE in rock,soil and navel orange plants is that the proportion of the light REE increases gradually and that of the heavy REE decreases gradually.However,the percentage content of the heavy REE somewhat increases in the peripheral organs of navel orange plants;e.In the three-dimensional profile of the rock-soil-navel orange system,the vertical direction of movement of the REE assumes the relationship between vectors.f.The content of REE in navel orange flesh is lower than the limitation standard stipulated by national food and health regulations.

关 键 词：稀土元素 岩石 土壤 脐橙 迁聚特征 

分 类 号：P595[天文地球—地球化学] S154.2[天文地球—地质学]