阿克苏市绿地土壤重金属含量特征及污染评价
Assessment of heavy metal concentration charatc eristics and pollution risk in Aksu City
阿依加马力·克然木 1玉米提·哈力克1
作者信息
- 1. 新疆大学资源与环境科学学院, 新疆乌鲁木齐830046;新疆维吾尔自治区绿洲生态教育部重点实验室, 新疆乌鲁木齐830046
- 折叠
摘要
为研究阿克苏市土壤重金属污染现状,选择阿克苏市具有代表性的5个不同功能区的绿地土壤为研究对象,按0～20 cm、20～40 cm、40～60 cm、60～100 cm分层取样,对土壤中Cu、Pb、Zn、Ni和Cr等重金属含量进行测定,利用统计分析、 主成分分析、 地累积指数法和潜在生态风险指数法对土壤重金属的污染状况进行评价.结果表明:不同功能区绿地土壤中Pb、Cu和Zn含量严重超标,分别是新疆土壤背景值的3.92、3.64和1.75倍,是国家土壤环境质量二级标准值(GB15618—1995)的2.92、4.30和1.62倍.不同土层重金属含量对比可知,随着土层深度的增加重金属含量逐渐降低.不同功能区绿地土壤重金属含量有明显差异,交通枢纽区的土壤重金属含量较高,城郊林区较低.5种重金属元素的污染程度大小依次为Pb>Cu>Zn>Cr>Ni,工业区土壤中Cu元素处于中度生态风险之外,其它元素基本处于无风险状态.5个功能区绿地土壤重金属综合潜在生态风险指数都低于150,属轻度污染.Zn和Cu元素主要来自于城市交通、 生活垃圾以及工业废物等人工源,Ni和Pb是双源型,受人为因素和成土母质的影响,而Cr主要来源于土壤母质等自然源.
Abstract
In order to investigate soil heavy metal pollution level of green space at 5 different functional areas in the Aksu City, Xinjiang, soil samples were taken from 0-20 cm, 20-40 cm, 40-60 cm and 60-100 cm layer, and the content of Cu, Pb, Zn, Ni and Cr were measured.This paper analysed the soil heavy metal pollution situation and its pollution assessment based on the statistical analysis, principal component analysis, geo-accumulation index and potential ecological risk index.The results showed that the average content of Pb, Cu, Zn heavy metals exceeded the reference value of Xinjiang by 3.92, 3.64 and 1.75 times as well as exceeded the national soil environment qualityⅡstandard value ( GB15618—1995) by 2.92, 4.30 and 1.62 times.Heavy metal concentration appeared decrease trend with the increase of the soil depth.Soil heavy metal concentrations showed significantly different among the 5 areas and the level of transportation area was relatively high while that of suburban forest area was relatively low.The assessment of soil heavy metal pressented that 5 heavy metal ranked by Pb>Cu>Zn>Cr>Ni, Cu were located in moderate pollution situation but no pollution danger for Cr and Ni comprehensive potential ecological risk index of 5 heavy metal were all lower than 150 ( minor ecological risk) .The heavy metals in soil of urban green space came from different sources, Zn and Cu were mainly originated from anthropogenic sources, such as traffic, life waste, indurstrial waste, and Ni, Pb were originated from anthropogenic as well as natural sources while Cr were only controlled by natural sources.
关键词
阿克苏市/绿地/土壤/重金属/生态风险/污染评价Key words
Aksu City/soil/green space/heavy metal/ecological risk/pollution assessment引用本文复制引用
基金项目
国家自然科学基金(31770750)
国家自然科学基金(51704259)
新疆大学优秀博士研究生创新基金(XJUBSCX-2015013)
出版年
2018
国家科技期刊平台
NSTL
维普
万方数据