This study investigated the impact of topography and vegetation on distribution of rare earth elements(REE)in calcareous soils using methods of single extraction and mass balance calculation.The purposes of the study are to set a basis for further research on biogeochemical REE cycle,and give references for soil water conservation and REE-containing fertilizer amendment.The results showed that Post-Archean Average Australian Shale(PAAS)normalized REE pattern of the studied calcareous soils was generally flat.The enrichment degree of REE varied widely.The proportion of acid-soluble phases of heavy REE(HREE)was higher than that of light REE(LREE).From top to bottom of the studied hills,the source of REE in calcareous soils dominated by limestone in situ weathering was gradually replaced by input from REE-containing phases(i.e.,clay minerals,amorphous iron or REE-containing fluids).Our results indicate that the REE pattern of calcareous soils is mainly controlled by slope aspect,while the enrichment degree of REE is related to the geomorphological position and vegetation type.Furthermore,the proportion of acid-soluble phases of REE is mainly controlled by geomorphological position.
REE distribution Weathering and pedogenesis Topography and vegetation Calcareous soils
Zhaoliang Song Yuntao Wu Xiaomin Yang Zijuan Xu Linan Liu Xiaodong Zhang Qian Hao Shaobo Sun Guilin Han Congqiang Liu
Institute of the Surface-Earth System Science Research,Tianjin University,Tianjin 300072,China State Key Laboratory of Resources and Environment Information System,Institute of Geographic Science School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100083,Ch Institute of the Surface-Earth System Science Research,Tianjin University,Tianjin 300072,China;State