海南省土壤中稀土元素的生物有效态含量和总量  

Bioavailable and total concentrations of rare earth elements in Hainan Island soils

作　　者：朱维晃[1] 毕华[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]海南师范大学资源环境与旅游系,海南海口571158

出　　处：《生态环境》2008年第3期1244-1249,共6页Ecology and Environmnet

基　　金：国家自然科学基金项目(40061003)

摘　　要：利用高灵敏度、低检出限的ICP-MS研究了海南省土壤中稀土元素总量和有效态含量。结果表明:海南土壤中各稀土元素总量均高于全国背景值,是全国背景值的110～160%,各稀土元素的有效态含量与总量之间的相关系数在0.663～0.949范围内变化(p<0.01,n=63),具有明显正相关性。为深入探讨和评估土壤中稀土元素的生态和环境效应,制定农用稀土开发利用过程中的环境保护对策提供科学依据,将土壤中稀土元素总量和有效态含量结合起来研究是很有必要的;文章研究首次得出如下结论:海南土壤中生物有效态稀土元素含量占总量的23%～60%,显示出稀土元素生物有效性程度很高,所以稀土微肥在农业上的应用,在海南省应该区别不同的土壤类型,避免盲目向土壤中添加稀土,对保护土壤环境,维护农业生态系统有积极的科学指导意义。Total and bioavailable concentrations of rare earth elements （REEs） were measured for 63 soil samples in hainan province as well as the distribution, characteristics and concentrations of the REE in the soils are also discussed. The study covers the whole province. The study of the correlation between total and bioavailable concentrations of REE shows that it is necessary to study the bioavailable and total concentrations together in soils to assess the ecological and environmental effects and provide scientific information on REEs application as micro-elemental fertilizers, and consequently their potential environmental risks. Through this research, the author draw some conclusions as below： 1） the total concentration of the REEs in soils is higher than the that of the back ground values in China; 2） the pearson correlation coefficient between total and bioavailabie concentrations of rare earth elements is in the range of 0.663-0.949（p〈0.001, n=63）, which show positive correlation; 3） the percentage of the bioavailable concentrations in the soils is high enough to 60%, so REEs application as micro-elemental fertilizers should applied to specific kinds of soil in order to overcome the unreasonable application, and it also significative to maintain the agro-ecosystem and protection about the soil resource.

关 键 词：土壤 稀土元素 生物有效性 分布模式 

分 类 号：S153.62[农业科学—土壤学]