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重庆侏罗纪地层区土壤硒含量分异:以江津和石柱地区为例

Differentiation Mechanism of Se Concentration in Soil Covering the Jurassic Strata in Chongqing:Case Studies from Jiangjin and Shizhu Regions
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摘要 相似地质背景区、相同成土母岩下土壤硒的空间分异特征的研究相对薄弱,长期制约着对土壤硒素分异机制的全面认识。本文以同处四川中生代前陆盆地且成土母岩同为侏罗纪陆相红色碎屑岩的重庆市江津区和石柱县为研究区,通过野外采样、室内分析和数理统计等方法,探讨土壤硒及其生物有效性的分异特征,对揭示土壤硒富集机制提供新的参考。结果表明,江津区表层土壤总硒(TSe)含量(0.32×10^(-6))显著高于石柱县(0.21×10^(-6));江津区富硒等级土壤占比46%,而石柱县为21%。江津区表土磷酸盐提取态硒(ASe)含量(0.03×10^(-6))和ASe/TSe(11.2%),均显著高于石柱县(0.02×10^(-6)和9.9%)。与石柱县相比,江津区表土TSe、ASe与土壤有机质(SOM)的相关程度较强。研究认为,即使同发育在四川中生代前陆盆地侏罗纪陆相红色碎屑岩上的土壤,土壤硒含量及其生物有效性也具有显著性差异,而这种差异可能是由于土壤有机质含量等土壤理化性质差异影响了土壤硒的迁移和富集所致。 The differentiation mechanism of selenium(Se),and its bioavailability in soils developed from same pedogenic rocks in a similar geological environment remains elusive.To further explore the above issue,the surface soil samples above the Jurassic continental red beds were collected from the Jiangjin district(Se-rich)and Shizhu County(Se-poor)of Chongqing,and their chemical compositions were analyzed.This study provides an important reference to reveal the soil Se enrichment mechanism,and shows that the total soil Se content(TSe)at Jiangjin(0.32×10^(-6),arithmetic mean)is much higher than that of the Shizhu County(0.21×10^(-6)).The proportion of Se-rich soil is 46%at Jiangjin and 21%at Shizhu.The phosphate extractable Se(ASe)content and ASe/TSe ratio at Jiangjin are significantly higher than those at Shizhu(0.02×10^(-6)and 9.9%,respectively).A stronger positive correlation between the TSe and ASe and organic matter(SOM)in the soil at Jiangjin than at Shizhu are revealed.It is concluded that the soil Se content and its bioavailability are very different from those developed on the Jurassic red beds in the Mesozoic Sichuan foreland basin,and this difference may be caused by the differences in soil physicochemical properties(such as the soil organic matter content),which affected the soil Se migration and enrichment.
作者 刘永林 赵家宇 刘怡 吴梅 肖慧娴 刘丁慧 田兴磊 LIU Yonglin;ZHAO Jiayu;LIU Yi;WU Mei;XIAO Huixian;LIU Dinghui;TIAN Xinglei(Key Laboratory of GIS Application Research,Chongqing Normal University,Chongqing 401331,China;Geography and Tourism College,Chongqing Normal University,Chongqing 401331,China;Shandong Institute of Geological Sciences,Jinan,Shandong 250013,China)
出处 《现代地质》 CAS CSCD 北大核心 2023年第6期1644-1654,共11页 Geoscience
基金 国家自然科学基金项目“重庆江津百岁老人与天然水、土壤中生命元素的区域分异研究”(41502329) 重庆市教育委员会科学技术计划重点项目“相似地质环境下克山病区和长寿区域土壤硒及生物有效性的对比研究”(KJZDK202100504) 重庆市自然科学基金项目“不同地层岩性下土地利用覆被变化对土壤硒及其赋存形态分异的影响机制”(CSTB2023NSCQ-MSX0496)。
关键词 侏罗纪 陆相红色碎屑岩 江津区 石柱县 selenium Jurassic continental red bed Jiangjin district Shizhu County
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