嘉陵江流域紫色土区土壤磁化率和粒度对重金属污染的响应特征

doi:10.16036/j.issn.1000-2650.202103199

摘要/Abstract

摘要： 目的: 嘉陵江流域紫色土区是长江上游重要的农业区,人为作用对土壤扰动较强,水土流失严重,探讨该区不同土地利用方式下土壤重金属污染现状及其对磁化率和粒度的影响,对长江上游生态环境保护具有重要意义。方法: 采集并测试了嘉陵江流域中段南充市城区和郊区不用土地利用方式下78个表层土壤的重金属元素（Cr、Ni、Cu、Zn、As、Cd、Pb和Mn）、磁化率和粒度组成,采用数理统计方法对这3个指标进行了相关性分析。结果: 研究区土壤质量磁化率与频率磁化率、粒度相关性不显著,有别于自然发育土壤和污染严重土壤,表明人为作用改变了土壤自然发育形成的物理性质,但土壤未受污染;土壤磁性颗粒主要受人类活动影响,表现为频率磁化率偏低;质量磁化率与主要重金属污染元素呈显著正相关,Pb、Cu和As是研究区主要的外源性输入物;土壤黏粒含量与Cr、Ni、Cu、Zn及As呈显著正相关,而与Cd呈显著负相关,粒度与Pb相关性不显著;土壤中Cd、Cr和Ni主要受控于自然因素,未受人为活动影响。结论: 土壤磁化率、粒度特征及其与重金属含量的相关性分析可初步判断土壤是否受到污染,并辨识主要重金属污染物。

关键词: 紫色土, 重金属污染, 磁化率, 粒度, 环境响应

Abstract: 【Objective】 As an important agricultural area in the upper reaches of the Yangtze River,purple soil area in the Jialing River Basin has serious soil erosion as the purple soil was frequently disturbed by humans. It is helpful for protection of ecological environment to investigate the status of heavy metal pollution and its relation with magnetic susceptibility and particle size of soils in the region. 【Method】 Heavy metal elements （Cr,Ni,Cu,Zn,As,Cd,Pb and Mn）,magnetic susceptibility and grain size composition of 78 topsoil samples in the urban and suburban areas of Nanchong City in the middle Jialing River,and their correlations were analyzed. 【Result】 The insignificance relationships between the magnetic susceptibility,frequency magnetic susceptibility and particle size,are different from the correlation from that of the obvious polluted soil or the soil formed in natural environment,indicating that the soil physical properties ascribed by natural development were changed by human activities,whereas the soil was not polluted. The soil magnetic particles were mainly affected by human activities,resulted in a low frequency susceptibility. The mass magnetic susceptibility was significantly positively correlated with the main pollution elements including Pb,Cu,and As. A significantly positive relationship was detected between the clay content and the elements of Cr,Ni,Cu,Zn and As,whereas the clay content was obvious negatively correlated with Cd. The particle size had no correlation with Pb. Cd,Cr and Ni contents of the soils were mainly controlled by natural factors and were not affected by human activities. 【Conclusion】 The correlation analysis between soil magnetic susceptibility,particle size characteristics and heavy metal content may be used as a method for identifying heavy metal pollution of soil environment.

Key words: purple soil, heavy metal pollution, magnetic susceptibility, grain size distribution, environmental response

中图分类号:

S153.1

周如玉, 王迪, 文敏, 文星跃. 嘉陵江流域紫色土区土壤磁化率和粒度对重金属污染的响应特征[J]. 四川农业大学学报, 2023, 41(4): 683-689.

ZHOU Ruyu, WANG Di, WEN Min, WEN Xingyue. Response of Magnetic Susceptibility and Particle size to Heavy Metal Pollution for the Purple Soil in the Jialing River Basin, China[J]. Journal of Sichuan Agricultural University, 2023, 41(4): 683-689.

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