长江下游冲积平原区土壤稀土元素富集与分馏特征  

Enrichment and fractionation of rare earth elements in alluvial plain soils at the lower reaches of the Yangtze River

作　　者：杨洁[1] 张娅璐 宿宝巍 韩林芮 胡丹阳 张欢 高超[1] YANG Jie;ZHANG Yalu;SU Baowei;HAN Linrui;HU Danyang;ZHANG Huan;GAO Chao(School of Geography and Ocean Sciences,Nanjing University,Nanjing,210046,China;School of Marine Science and Engineering,Nanjing Normal University,Nanjing,210046,China)

机构地区：[1]南京大学地理与海洋科学学院,南京210046 [2]南京师范大学海洋科学与工程学院,南京210046

出　　处：《环境化学》2023年第10期3301-3309,共9页Environmental Chemistry

基　　金：国家自然科学基金(41877002)资助.

摘　　要：在长江下游冲积平原区建立了一个跨度约1500 a的土壤时间序列,通过对比稀土元素(REE)含量和分馏的变化,分析其在成土过程中的演变特征与控制因素.研究结果表明,REE含量经过成土初期的略有下降后,随着时间推移总体上呈增加的趋势.次生矿物和有机质对REE较强的捕获和吸附固定能力是土壤REE富集的主要原因,磷肥的长期施用可能也是REE在土壤中不断积累的重要原因.旱作和水旱轮作两种主要农用方式对单个REE含量和总量差异的影响不显著.土壤中轻、重REE的分馏和Ce、Eu的亏缺也随成土时间推移变化.水稻种植导致土壤氧化还原电位下降,直接和间接增加了Ce和Eu的亏损.A soil chronosequence with a span of about 1500 years was established in the alluvial plain area of the lower reaches of the Yangtze River.By comparing the changes of rare earth element(REE)contents and fractionations,their evolution characteristics and control factors in the pedological process were analyzed.The results show that after a slight decrease in the initial stage of soil formation,the content of REE generally increases with the passage of time.The strong scavenging and fixing ability of secondary minerals and organic matter on REE is suggested as the main reason for the enrichment of REE in soil.The long-term application of phosphorus fertilizer might also lead to the continuous accumulation of REE in soil.Dry farming and paddy dry rotation had no significant effect on the contents of single REE andΣREE.The fractionation of light and heavy REE and the deficiency of Ce and Eu also changed with the time of soil formation.Rice planting led to the decrease of soil redox potential,which directly and indirectly increased the negative anomalies of Ce and Eu.

关 键 词：长江下游平原 土壤时间序列 成土过程 稀土元素 分馏 

分 类 号：S153.6[农业科学—土壤学]