赣南某些作物中稀土元素地球化学特征

Geochemical Characteristics of Rar e Earth Elements(REE)in Some Crops in Gannan

对赣南地区(我国稀土元素高背景区)烟、茶、柿、枣典型产地植物样品(叶、果)和土壤样品中的稀土元素进行了采样测试分析研究。结果表明,植物稀土含量具有烟叶>枣叶>柿叶>茶叶>枣果>柿果的特点,这除了与产地土壤稀土丰度有一定关系外,主要受各种作物对稀土的吸收富集强度控制;同时,植物对稀土的吸收过程引起了稀土的分馏作用,在烟、枣、柿的叶片中轻、中稀土得到分馏富集,而茶叶呈现弱的重稀土分馏富集;稀土元素Ho表现出相对强的植物生理活动性。

A survey was conducted and showed th at the REE metals concentrations in s everal plants decreased greatly as f ollowing order:tobacco leaf,jujube leaf,persimmon leaf,tea leaf,jujube fruit s and persimmon fruits in a region wit h REE -rich,in Gan-nan,China.It has been found that the accumulation of REE was partly related to the contents in soil where vegetable sample was collected,but mainly caused by enrichment coefficient for REEs in the re spective plants.It was found that ve getable REE frac-tionation existed,and in most cases light and medium REEs exhibited more ability in enrichment than heavy REE s in vegetation.It seemed that Ho has more capability to mobilize,transport in vegetables a nd accumulation in fruits than other REEs.