Rare earth element geochemistry in soils along arid and semiarid grasslands in northern China

作     者：Yi‑Wen Cao Xiao‑Ming Liu Chao Wang Edith Bai Nanping Wu Yi-Wen Cao;Xiao-Ming Liu;Chao Wang;Edith Bai;Nanping Wu

作者机构：CAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of SciencesBeijing 100049China Department of EarthMarine and Environmental SciencesUniversity of North Carolina‑Chapel HillChapel HillNC 27515USA Key Laboratory of Geographical Processes and Ecological Security of Changbai MountainsSchool of Geographical SciencesNortheast Normal UniversityChangchun 130024China Institute of Deep‑Sea Science and EngineeringChinese Academy of SciencesSanya 572000China 

出 版 物：《Ecological Processes》 (生态过程（英文）)

年 卷 期：2022年第11卷第1期

页      面：386-399页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by Chinese Academy of Sciences(No.E01X0301) National Natural Science Foundation of China(Grant No.41673005) support from China Scholarship Council.Youth Innovation Promotion Association CAS to Chao Wang(2018231) 

主　　题：Rare earth elements Soil Grassland Northern China Aridity index 

摘      要：Background:Rare earth elements(REE)are a group of trace elements that behave geochemically *** fractionation patterns normalized to reference materials provide a powerful tool for documenting *** processes are particularly difficult to illustrate with respect to contemporary and past climate *** this study,we characterize the rare earth element(REE)contents in bulk soils and respective geochemical fractions(e.g.,exchangeable,carbonate‑bound,reducible,and oxidizable fractions)and to decipher the relationships between REE geochemistry components and climatic factors across a large‑scale northern China transect(NCT).Results:Across the NCT,bulk REE concentrations ranged from 55.2 to 241.1μg g^(−1)with a main portion in the residual fraction(49–79%),followed by oxidizable fraction(2–40%),reducible fraction(3–22%),carbonate‑bound fraction(0.1–16%),and negligible exchangeable *** REE contents of geochemical components(carbonate‑bound,reducible,and oxidizable)in topsoils correlated to climate factors(mean annual precipitation,mean annual temperature,potential evaporation,and aridity index(AI)).The normalized abundances to the upper continental crust(UCC)composition show that the middle REE was generally enriched than the light REE and heavy REE in topsoils along the *** overall UCC‑normalized bulk REE patterns in topsoils and subsoils were similar,characterized by weak negative Ce anomalies and positive Eu ***:Our data in topsoils and depth profiles collectively suggest that cycling of REE was primarily regulated by abiotic processes in area with AI*** similar UCC normalized patterns in topsoils suggest that the REE was originated from a common source with limited influences from other sources(e.g.,atmospheric dusts and anthropogenic contribu‑tions).Our results to some extent provide evidence for