海南岛东部地区砖红壤中稀土元素含量及其纵向分异研究  

VERTICAL DISTRIBUTION PATTERN OF REE CONTENTS IN LATOSOL IN THE EASTERN AREAS OF HAINAN ISLAND

作　　者：赵志忠[1] 许德如[1] 毕华[2] 唐少霞[2] 

机构地区：[1]中国科学院边缘海地质重点实验室,广东广州510640 [2]海南师范大学资源环境与旅游系,海南海口571158

出　　处：《大地构造与成矿学》2006年第3期401-407,共7页Geotectonica et Metallogenia

基　　金：中国科学院边缘海地质重点实验室项目(MSGL0621);教育部科学技术研究重点项目(地方03148;地方02166);海南省教育厅科学技术项目(Hikj200311);国家自然科学基金项目(40061003);海南省自然科学基金项目(40304)联合资助.

摘　　要：对海南岛东部地区发育典型的5个砖红壤剖面的REE组成特征及其纵向变化规律进行研究发现,基岩与成土母质决定着土壤中稀土元素的最初含量,由花岗岩风化而成的砖红壤的REE含量大于砂页岩风化而成的砖红壤的REE含量,土壤表层强烈的淋溶作用又导致由土壤剖面深部至浅部∑REE逐步减少。基岩及成土母质决定了砖红壤中呈现的LREE富集及Eu亏损的特点,而土壤发育过程中REE分异作用又使这些特征在成土母岩的基础上发生了一定程度的叠加。砖红壤剖面表层氧化和水解作用导致Ce在土壤表层中的富集,并导致由剖面深部至浅部,Ce呈现出由负异常向正异常演化之趋势。Various soil samples were collected from five latosol profiles in the eastern Hainan Province, and the REE composition features of these samples and their spatial changes in these latosol profiles were analyzed. The analytical results show that the total REE contents in soils are correlative with both material horizon and basic rocks. Moreover, the total REE contents of latosol which were developed from granite are higher than those developed from sand-shale rocks, and the total REE contents decreased from horizon A to horizon C in each latosol profile. With the intensive development of soil, LREE gains and HREE loses. The results also indicate that the negative Eu anomaly of latosol is due to both the material horizon and basic rocks, but the tendency of negative Ce anomaly turns out to be positive Ce anomaly from horizon C to horizon A of latosol profiles is resulted from the migration of REE due to oxidation and hydrolysis at the top of the latosol profiles.

关 键 词：稀土元素 砖红壤 纵向分布 海南岛 

分 类 号：S151[农业科学—土壤学]