【作者】 毕华； 王薛平； 刘强； 赵志忠； 杨元根； 朱维晃；

【Author】 Bi Hua, Wang Xueping , Liu Qiang, Zhao Zhizhong , Yang Yuangen , Zhu Weihuang (Department of Resources , Environment and Tourism , Hainan Normal University, Haikou 571158, China; Biology Department, Hainan Normal University, Haikou 571158, China; Institute of Geochemistry , Chinese Academy of Sciences , Guiyang 550002 , China )

【机构】 海南师范大学资源环境与旅游系； 海南师范大学生物系； 中国科学院地球化学研究所；

【摘要】 海南岛花岗岩砖红壤中稀土、轻稀土、有效态稀土总量平均值均高于地壳的稀土总量平均值186 μg·g-1;富集轻稀土;有效态稀土含量高,介于17．99％～80．25％之间,平均为43．35％,与稀土总量之间有显著的正相关关系,且与海南岛热带高温潮湿的气候、强烈的化学风化作用、酸性-弱酸性的土壤环境有关。水平空间上,海南岛花岗岩砖红壤中稀土、轻稀土、有效态稀土总量平均值从低山丘陵区→中部山地→台地平原降低;而重稀土总量平均值则从中部山地→低山丘陵→台地平原降低。在垂直空间上,海南岛砖红壤各发生层自下而上(从C →B→A),稀土、轻稀土的总量平均值逐渐降低;重稀土、有效态稀土总量平均值从B→C→A减少,但在台地平原区,与稀土、轻稀土的变化规律相同。海南岛花岗岩砖红壤属弱-中等铕亏损,为负铕异常。铈在各构造地貌单元花岗岩砖红壤近地表处(A层)及海拔较低的台地平原相对富集,为正异常;向土壤深处,由无异常到弱负异常。更多还原

【Abstract】 The average gross of rare earth elements (REE), light rare earth elements (LREE) and available REE are higher than the crustal mean value of 186 ppm in granitic laterite in Hainan Island, which is rich in LREE. The content of available REE is high with average of 43.35%, between 17.99% and 80. 25 % , which has positive correlation with the gross of REE and relates to the tropical high temperature-damp climate and the acidity-weak acidity soil environment in Hainan Island. On the horizontal space, the average gross of REE, LREE and available REE are in the order of low mountain area > middle mountain area > mesa plain area, while the average gross of HREE is in the order of middle mountain area > low mountain area>mesa plain area. On the vertical space, the average gross of REE and LREE reduce gradually from the bottom to top of the laterite of Hainan Island (C→B→A), while the average gross of HREE and available REE reduce in the order of B→C→A, but in the mesa plain area, the mutative rule is the same as REE and LREE. The granitic laterite of Hainan Island belongs to the type of infirm-middle Eu depletion and negative Eu anomaly. Ce is positive anomaly and rich in the A layer of granitic laterite of every structural landform unit and low elevation mesa plain area correspondingly , while in the depth of soil, it is infirm negative anomaly and tends to be normal.更多还原