中国土壤重金属的时空变化:污染状况与风险评估。
Spatiotemporal variation of soil heavy metals in China: The pollution status and risk assessment.
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; Nanjing University (Suzhou) High-tech Institute, Suzhou 215123, China.
State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
出版信息
Sci Total Environ. 2023 May 1;871:161768. doi: 10.1016/j.scitotenv.2023.161768. Epub 2023 Feb 3.
Soil heavy metal pollution has been a serious and widespread problem in China. Although more attention has been paid on soil pollution status of heavy metals in China, systematic reviews on the spatiotemporal distribution of soil heavy metals and their related health risk considering different land use types at a national scale are still lacking. In this review, we extracted concentrations of seven heavy metals in soils including lead (Pb), cadmium (Cd), mercury (Hg), chromium (Cr), arsenic (As), nickel (Ni), and copper (Cu), assessed the spatiotemporal distribution of soil heavy metal concentrations from studies carried out between 1977 and 2020, and estimated the ecological and human health risks on a national scale. Among the seven metals, associated risks posed by Pb and As are more serious compared to other metals. Based on the temporal trend of the geoaccumulation index of the seven heavy metals during 1977-2020, there is no further increasing trend. Among different land use types, mining areas showed higher risk compared to others. Totally, the pollution was more serious in southeast China than those in northwest. Children and adult females are identified as the priority group for protection. This paper presents a comprehensive ecological and health risk assessment of seven heavy metals in soils across China considering different land use types and spatiotemporal variation, and provides important evidence for policy makers to manage and reduce soil heavy metal pollution and related health risks.
土壤重金属污染在中国一直是一个严重且广泛存在的问题。尽管中国对土壤重金属污染状况的关注度不断提高,但对于全国不同土地利用类型的土壤重金属时空分布及其相关健康风险的系统评价仍然缺乏。在本综述中,我们提取了土壤中包括铅(Pb)、镉(Cd)、汞(Hg)、铬(Cr)、砷(As)、镍(Ni)和铜(Cu)在内的七种重金属的浓度,评估了 1977 年至 2020 年间开展的研究中土壤重金属浓度的时空分布,并对全国范围内的生态和人体健康风险进行了评估。在这七种金属中,与 Pb 和 As 相关的风险比其他金属更为严重。基于 1977-2020 年这七种重金属的地积累指数的时间趋势,没有进一步增加的趋势。在不同的土地利用类型中,矿区的风险高于其他类型。总的来说,中国东南部的污染比西北部更为严重。儿童和成年女性被确定为优先保护群体。本文综合考虑了不同土地利用类型和时空变化,对中国土壤中七种重金属的生态和健康风险进行了评估,为决策者管理和减少土壤重金属污染及相关健康风险提供了重要依据。