贵州省土壤重金属背景值再研究
Redistribution of heavy metal background in soil in Guizhou Province
李龙 1马丽钧 1周浪 1宋波1
作者信息
- 1. 桂林理工大学,环境科学与工程学院,桂林,541004
- 折叠
摘要
为探究贵州省背景土重金属含量的基本状况,进行了系统的场调工作,共采集自然土样468件.通过统计学和对比研究的方法,在"省域尺度"、"市域尺度"和"主要土类"的3个视角下重新提出贵州省土壤重金属的背景值.结果表明,省域推荐值分别为ω(Cd)0.220mg·kg-1、ω(Co)12.35mg·kg-1、ω(Cr)87.68 mg·kg-1、ω(Cu)33.70 mg·kg-1、ω(Mn)668.7 mg·kg-1、ω(Ni)33.99 mg·kg-1、ω(Pb)19.91 mg·kg-1、ω(Zn)88.88 mg·kg-1、ω(As)21.29mg·kg-1和ω(Hg)0.151 mg·kg-1.与《中国土壤元素背景值》相比,Hg含量提高77.41％;Cu和As含量分别提高25.28％和33.06％;而Co和Pb含量低于省域推荐值,分别降低29.83％和36.39％.市域尺度下,贵州省背景土的重金属含量在地理空间上呈西北高、东南低的分布特点,其中,安顺市所有元素的均值水平均超过省域推荐值,超出5％-60％;而黔东南全部未超.主要土类下,黄棕壤土和石灰土表现出对重金属较强的富集特点,其中黄棕壤土在全省的分布与市域推荐值的高值区域基本吻合,毕节的中西部、六盘水和黔西南的北部都以黄棕壤为主要土类,研究涉及的重金属含量普遍偏高.水稻土的重金属含量受成土母质和人为因素的叠加影响,对于地质高背景区和工矿区附近,其含量水平较土类推荐值存在偏低的估计,需要开展针对性的研究工作.省域推荐值对于了解各重金属的实际分布存在局限性,因此,市域推荐值和土类推荐值有助于识别重金属含量的区域性分布特征.
Abstract
In order to explore the background value of soil heavy metals in Guizhou Province,We have conducted a systematic survey in the local,and 468 natural soil samples were collected.By means of statistics and comparative study,through the three perspectives of"province","cities"and"main soil types",the background values of soil heavy metals in Guizhou Province are re-proposed.The recommended value of province as follows:ω(Cd)0.220 mg·kg-1,ω(Co)12.35 mg·kg-1,ω(Cr)87.68 mg·kg-1,w(Cu)33.70 mg·kg-1,ω(Mn)668.7 mg·kg-1,ω(Ni)33.99 mg·kg-1,ω(Pb)19.91 mg·kg-1,ω(Zn)88.88 mg·kg-1,ω(As)21.29 mg·kg-1和ω(Hg)0.151 mg·kg-1.Compared with the Background Values of Soil Elements in China,the Hg content increased by 77.41％,followed by the Cu and As contents increased by 25.28％and 33.06％;while the Co and Pb contents were lower than the provincial recommended values and decreased by 29.83％and 36.39％.At the city scale,the content of heavy metals in the background soils of Guizhou Province shows a geographical distribution characteristic of high in the northwest and low in the southeast.The average levels of all elements in Anshun exceed the provincial recommended values,the excess value ranges from 5％to 60％,while those in Qiandongnan by contrast.Among the main soil types,yellow-brown soil and lime soil showed a strong trend of heavy metal enrichment,and the coverage of yellow-brown soil in the whole province was basically similar to the regional distribution of the high value of heavy metal content in the recommended value of the city.Yellow brown soil is the main soil type in the central and western parts of Bijie,Liupanshui and the northern part of Qianxinan,and the content of heavy metals involved is generally high.The content of heavy metals in paddy soil is affected by the superposition of soil parent materials and human factors.For paddy soils in high background areas and near industrial and mining areas in the province,their content levels are estimated to be lower than the recommended values for soil types,which need to be targeted to research.The provincial recommended value has a high or low estimate about the average level with a particular element in a local area.Therefore,the proposal of the recommended value about the cities and the soil types can help to better understand the regional distribution characteristics.
关键词
贵州省/自然土/背景值/重金属/行政区划/土类Key words
Guizhou Province/natural soil/the background value/heavy metal/administrative division/soil types引用本文复制引用
基金项目
国家重点研发计划重点专项(2018YFD0800600)
广西壮族自治区科技重大专项(AA17204047-2)
出版年
2024
NETL
NSTL
万方数据