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(χ_(lf))、频率磁化率(χ_(fd))、高场磁化率(χ_(para))]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,χ_(lf)与Cr、Zn、As含量显著正相关,χ_(fd)%与各重金属含量不相关;χ_(para)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χ_(lf)和χ_(para)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。χ_(para)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。
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(χ_(lf),χ_(fd)%,χ_(para))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 χ_(lf) was positively correlated with the contents of Cr,Zn and As,and the frequency susceptibility χ_(fd)%was not correlated with the contents of heavy metals.High-field magnetic susceptibilityχpara was significantly positively correlated with the contents of heavy metals Cr,Pb,As,Hg and Zn.This study showed that soil magnetic parameters χ_(lf) and χ_(para) 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 χ_(para) 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.
作者
叶俊民
任二慧
罗鑫
李海侠
李刚强
陈宇东
YE Jun-min;REN Er-hui;LUO Xin;LI Hai-xia;LI Gang-qiang;CHEN Yu-dong(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093)
出处
《中国土壤与肥料》
北大核心
2025年第1期62-72,共11页
Soil and Fertilizer Sciences in China
基金
国家自然科学基金(42064005)。
关键词
土壤
重金属
磁化率
相关性
soil
heavy metals
magnetic susceptibility
relevance
