Effects of topography and vegetation on distribution of rare earth elements in calcareous soils  

作　　者：Zhaoliang Song Yuntao Wu Xiaomin Yang Zijuan Xu Linan Liu Xiaodong Zhang Qian Hao Shaobo Sun Guilin Han Congqiang Liu 

机构地区：[1]Institute of the Surface-Earth System Science Research,Tianjin University [2]State Key Laboratory of Resources and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences [3]School of Water Resources and Environment, China University of Geosciences (Beijing) [4]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry, Chinese Academy of Sciences

出　　处：《Acta Geochimica》2017年第3期469-473,共5页地球化学学报（英文）

基　　金：supported jointly by the National Natural Science Foundation of China(41571130042,41522207,41325010);the State’s Key Project of Research and Development Plan of China(2016YFA0601002)

摘　　要：This study investigated the impact of topography and vegetation on distribution of rare earth elements(REEs)in calcareous soils using methods of single extraction and mass balance calculation. The purposes of the study were to set a basis for further research on the biogeochemical REE cycle and to provide references for soil–water conservation and REE-containing fertilizer amendments. The results show a generally flat Post-Archean Average Australian Shale—normalized REE pattern for the studied calcareous soils. REE enrichment varied widely. The proportion of acidsoluble phases of heavy REEs was higher than that of light REEs. From top to bottom of the studied hills, dominant REE sources transitioned from limestone in-situ weathering to input from REE-containing phases(e.g., clay minerals,amorphous iron, REE-containing fluids). Our results indicate that the REE content of calcareous soils is mainly controlled by slope aspect, while the enrichment degree of REEs is related to geomorphological position and vegetation type.Furthermore, the proportion of acid-soluble phases of REEs is mainly controlled by geomorphological position.This study investigated the impact of topography and vegetation on distribution of rare earth elements（REEs）in calcareous soils using methods of single extraction and mass balance calculation. The purposes of the study were to set a basis for further research on the biogeochemical REE cycle and to provide references for soil–water conservation and REE-containing fertilizer amendments. The results show a generally flat Post-Archean Average Australian Shale—normalized REE pattern for the studied calcareous soils. REE enrichment varied widely. The proportion of acidsoluble phases of heavy REEs was higher than that of light REEs. From top to bottom of the studied hills, dominant REE sources transitioned from limestone in-situ weathering to input from REE-containing phases（e.g., clay minerals,amorphous iron, REE-containing fluids）. Our results indicate that the REE content of calcareous soils is mainly controlled by slope aspect, while the enrichment degree of REEs is related to geomorphological position and vegetation type.Furthermore, the proportion of acid-soluble phases of REEs is mainly controlled by geomorphological position.

关 键 词：REE distribution Weathering and pedogenesis Topography and vegetation Calcareous soils 

分 类 号：S153.6[农业科学—土壤学]