| 母岩类型对土壤和沉积物镉背景的控制: 以贵州为例 |
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| 引用本文： | 夏学齐,季峻峰,杨忠芳,卢新哲,黄春雷,魏迎春,徐常艳,梁卓颖.母岩类型对土壤和沉积物镉背景的控制: 以贵州为例[J].地学前缘,2022,29(4):438-447. |
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| 作者姓名： | 夏学齐 季峻峰 杨忠芳 卢新哲 黄春雷 魏迎春 徐常艳 梁卓颖 |
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| 作者单位： | 1.中国地质大学(北京) 地球科学与资源学院, 北京 1000832.自然资源部 平原区农用地生态评价与修复工程技术创新中心, 浙江 杭州 3112003.南京大学 地球科学与工程学院, 南京 210023 |
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| 基金项目： | 国家重点研发计划项目(2017YFD0800303);中央高校基本科研业务费资助项目(2652018128);浙江省地勘资金项目(【省资】2019007) |
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| 摘 要： | 镉是土壤和沉积物中最受关注的重金属污染物之一,合理确定其自然背景对于环境管理具有重要意义。然而,由于不同基岩中该元素含量差异很大,且在风化成壤过程中元素也可能发生富集或贫化,造成该元素具有很大的空间变异,甚至可以超出筛选值和管制值。本文从基岩-土壤地球化学元素迁移规律出发,以基岩类型较复杂、镉空间变异较大的贵州省为例,基于土壤和沉积物调查数据,建立基岩与土壤或沉积物中镉含量的对应关系,筛选合理的岩性类型端员和背景区域划分方法,为环境管理确定基础背景。研究结果显示,岩性类型是造成土壤镉空间变异的重要因素,石灰岩(排除白云岩)、玄武岩、辉绿岩和碳质页岩等是造成土壤高镉背景的重要岩石类型。相对母岩类型,岩石所在地层时代对土壤镉背景的影响不太明显。本文通过大量数据统计,给出了相对较纯的岩性发育土壤的镉背景值和变异区间,不纯岩性或地质单元发育土壤的镉背景值可能受多个岩性端员的影响。
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| 关 键 词： | 土壤 镉 地质 高背景 重金属 |
| 收稿时间： | 2021-03-02 |
Parent rock type control on cadmium background in soil and sediment: An example from Guizhou Province |
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| XIA Xueqi,JI Junfeng,YANG Zhongfang,LU Xinzhe,HUANG Chunlei,WEI Yingchun,XU Changyan,LIANG Zhuoying.Parent rock type control on cadmium background in soil and sediment: An example from Guizhou Province[J].Earth Science Frontiers,2022,29(4):438-447. |
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| Authors: | XIA Xueqi JI Junfeng YANG Zhongfang LU Xinzhe HUANG Chunlei WEI Yingchun XU Changyan LIANG Zhuoying |
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| Institution: | 1. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China2. Technology Innovation Center of Ecological Evaluation and Remediation of Agricultural Land in Plain Area, Ministry of Natural Resources, Hangzhou 311200, China3. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China |
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| Abstract: | Cadmium (Cd) is one of the most concerned heavy metal pollutants in soil and sediment, and the accurate determination of its natural background values is of great significance in environmental management. However, due to the inherent concentration variability associated with bedrock types and elemental enrichment/depletion caused by weathering, Cd concentrations in surface soil and sediment vary greatly spatially. In some areas, Cd concentration may exceed the safety standard for agricultural land use (GB 15618-2018) under natural conditions. In this study, Guizhou Province, which has relatively complex bedrock types and high soil Cd variation, was selected as the study area. From the perspective of elemental migration from bedrock to soil, and based on geochemical survey data of the entire province, this study sought to investigate the link between bedrock and Cd concentrations in soil and sediment and develop classification schemes for endmember rock types and regions selected for Cd background measurements. The results showed that lithology was the key factor contributing to soil Cd variation, while limestone (relative to dolomite), basalt, diabase and carbonaceous shale contributed to high Cd background value in soil. Compared with the parent rock type, rock formation age had less influence on Cd background values. Through rigorous statistical analysis, the Cd background value and variance in soil were obtained for soils developed from relatively pure rock material. For soils developed from impure rock materials or from mixed geological units, the Cd background value may be affected by more than one endmember rock types. |
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| Keywords: | soil cadmium geology high background heavy metal |
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