基于Unmix模型的庐江县土壤重金属空间分布和来源解析

doi:10.19741/j.issn.1673-4831.2021.0807

摘要/Abstract

摘要： 为探究庐江县土壤重金属(As、Cr、Cu、Ni、Pb、V和Zn)分布特征及来源情况，采用网格布点法采集土壤表层样品，采用Unmix模型进行土壤重金属源解析，并结合空间分布特征进一步解释当地土壤重金属来源。结果表明，研究区土壤中As、Cu存在少数点位超标，其他重金属存在个别点位超标。庐江县土壤重金属空间分布总体呈东南向西北递减的趋势，东南部土壤中As、Cu、Pb和V富集程度较为严重。源解析结果表明，研究区内土壤重金属存在3个来源，分别为母质来源、工业源和矿业源，其对于区内土壤重金属的贡献占比分别为47%、28%和25%。其中，母质源为研究区土壤重金属主要来源。3个来源对于土壤中As、V和Zn元素均有一定程度的贡献，Cr、Ni主要来源于母质，Cu主要来源于矿业活动，Pb主要来源于工业活动。研究结果可为当地土壤重金属污染管控和治理提供理论支撑。

关键词: 土壤重金属, Unmix模型, 空间分布, 来源解析, 庐江县

Abstract: To explore the distribution and sources characteristics of soil heavy metals As, Cr, Cu, Ni, Pb, V and Zn in Lujiang County, surface soil samples were collected by using grid point method. The spatial distribution data of heavy metals and the Unmix model were jointly adopted to explain the sources of heavy metals. The results show that the As and Cu contents of a few soil samples in the study area exceeded the standard values. In addition, the contents of other heavy metals only exceeded the standard at individual sites. The spatial distribution of soil heavy metal content in Lujiang County generally showed a decreasing trend from southeast to northwest. Among them, in the southeast, the enrichment of As, Cu, Pb and V in the soil was higher than that in other areas. Parent material sources, industrial sources and mining sources were the main sources of heavy metals in local soils, and their contribution to soil heavy metals accounted for 47%, 28%, and 25%, respectively. Among them, the parent material source was the main source of local soil heavy metals. As, V and Zn in soil were affected by all the three sources. Cr and Ni were mainly derived from parent materials, Cu was mainly derived from mining activities, and Pb was mainly derived from industrial activities. The study can provide theoretical support for the control and governance of local soil heavy metal pollution.

Key words: soil heavy metal, Unmix model, spatial distribution, source analysis, Lujiang County

中图分类号:

X825

吴静, 方凤满, 马康, 林跃胜, 葛磊, 陈辉, 周浩. 基于Unmix模型的庐江县土壤重金属空间分布和来源解析[J]. 生态与农村环境学报, 2022, 38(9): 1204-1210.

WU Jing, FANG Feng-man, MA Kang, LIN Yue-sheng, GE Lei, CHEN Hui, ZHOU Hao. Spatial Distribution and Source Analysis of Soil Heavy Metals in Lujiang County Based on Unmix Model[J]. Journal of Ecology and Rural Environment, 2022, 38(9): 1204-1210.

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