云南景洪茶园土壤重金属分布特征及其与磁化率的相关性研究
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(昆明理工大学国土资源工程学院,云南 昆明 650093)

作者简介:

叶俊民(1999-),硕士研究生,主要从事土壤与岩石磁学研究。E-mail:yejunmin1999@163.com。

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基金项目:国家自然科学基金(42064005)。


Vertical distribution characteristics of heavy metals and their correlation with magnetic susceptibility in tea plantation soil of Jinghong Yunnan
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(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093)

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    摘要:

    以种植不同茶龄的土壤为研究对象,采集9条剖面共计54个样品,分析土壤中重金属(Cr、Cu、Pb、Zn、As、Cd、Hg)和3种磁化率[低频磁化率(χlf)、频率磁化率(χfd)、高场磁化率(χpara)]的分布特征及两者相关性。结果表明,研究区重金属含量空间变异性为中等变异,主要受自然因素影响;重金属污染指数均处于安全级别,土壤未受到污染。相关分析及主成分分析结果显示,Cr、Pb、As、Hg、Zn和Cu主要来源于自然成壤,Cd可能主要来源于施用的有机肥。结合磁参数分析发现,χlf与Cr、Zn、As含量显著正相关,χfd%与各重金属含量不相关;χpara与重金属Cr、Pb、As、Hg和Zn含量显著正相关。研究发现,土壤磁性参数χlf和χpara对来源于自然土壤的重金属元素的分布也具有很好的指示意义。χpara与5种重金属含量的相关系数R均大于0.8,剖面上的分布特征也与重金属的分布具有非常好的一致性,显示了该参数能够指示重金属在土壤中的迁移和积累。

    Abstract:

    In this study,54 samples were collected from 9 soil profiles of different tea ages to analyze the distribution characteristics and correlation of heavy metals(Cr,Cu,Pb,Zn,As,Cd,Hg)and magnetic susceptibility(χlf,χfd%,χpara)in soil. The results showed that the spatial variability of heavy metal content in the study area was medium,which was mainly affected by natural factors. Heavy metal pollution index content was at a safe level,and the soil was uncontaminated. The results of correlation analysis and principal component analysis showed that Cr,Pb,As,Hg,Zn and Cu were mainly derived from natural soils,and Cd might be mainly derived from organic fertilizers. Combined with magnetic parameter analysis,it was found the low frequency mass susceptibility χlf was positively correlated with the contents of Cr,Zn and As,and the frequency susceptibility χfd% was not correlated with the contents of heavy metals. High-field magnetic susceptibility χpara was significantly positively correlated with the contents of heavy metals Cr,Pb,As,Hg and Zn. This study showed that soil magnetic parameters χlf and χpara also had a good indication of the distribution of heavy metal elements from natural soil. At the same time,this study found that the correlation coefficient R between the high field magnetic susceptibility χpara and the content of five heavy metals was greater than 0.8,and the distribution characteristics on the profile were also in good agreement with the distribution of heavy metals,indicating that this parameter could indicate the migration and accumulation of heavy metals in the soil.

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叶俊民,任二慧,罗鑫,李海侠,李刚强,陈宇东.云南景洪茶园土壤重金属分布特征及其与磁化率的相关性研究[J].中国土壤与肥料,2025,(1):62-72.

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  • 收稿日期:2024-05-14
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  • 录用日期:2024-08-30
  • 在线发布日期: 2025-03-21
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