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Soil physiochemical properties and landscape patterns control trace metal contamination at the urban-rural interface in southern China.
Environ Pollut. 2019 Jul; 250:537-545.EP

Abstract

This study examined the influences of three subsets of environmental factors (i.e. soil physicochemical properties including pH, organic matters and soil texture, landscape patterns, and parent materials) on the spatial variations and sources of soil trace metal contamination across an urban-rural environmental gradient in Guangzhou City, southern China. We collected 318 surface soil samples from forests, orchards, farmlands, and urban lawns using a random tessellation design for selecting sample sites. The geo-accumulation indices showed that 18%-88% of soil samples were contaminated: moderate to high contamination with Cd and Hg, low to moderate contamination with Cu, Pb, Zn and Ni, and low contamination with As and Cr. However, less than 13% of soil samples were considered to have exceeded the national standards causing environmental and human health concerns. The mean geo-accumulation indices increased in the order of forest, paddy field/orchard, vegetable, road/residential, and park/residential areas for As, Cd, Ni, Pb, Zn, closely following a land disturbance gradient. Spearman Correlation and Cluster Analyses showed that Pb-Cu-Zn had traffic-related origins, Cd-Hg were mainly influenced by fertilization or industrial emissions, and As-Cr-Ni had geogenic origins for agricultural soils. In contrast, the Ni, Hg and Cd contamination sources for urban soils included both anthropogenic and geogenic origins. The Stepwise Regression and Partial Redundancy Analyses showed that three subsets of environmental factors explained 43%-87% of variations of soil contamination for both agricultural and urban soils. We concluded that soil contamination was mainly controlled by soil physiochemical properties followed by landscape patterns. Soil absorption of aerial loads of trace metal pollutants dominated the soil contamination processes. Our findings implied that improving soil physiochemical properties and landscape designs can strengthen environmental buffering and carrying capacity, thus alleviating soil contamination and reducing non-point-source pollution in the study region.

Authors+Show Affiliations

Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental Science and Technology, Guangzhou, 510650, China. Electronic address: licheng@soil.gd.cn.Eastern Forest Environmental Threat Assessment Center, USDA Forest Service, Research Triangle Park, NC, 27709, USA. Electronic address: ge.sun@usda.gov.School of Geographical Sciences, Guangzhou University, Guangzhou, 510006, China. Electronic address: gzuwzf@163.com.Department of Geographical Sciences, University of Maryland, College Park, 20742, USA. Electronic address: hzhong1@umd.edu.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental Science and Technology, Guangzhou, 510650, China. Electronic address: rpwang@soil.gd.cn.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental Science and Technology, Guangzhou, 510650, China. Electronic address: xnliu@soil.gd.cn.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental Science and Technology, Guangzhou, 510650, China. Electronic address: zxguo@soil.gd.cn.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental Science and Technology, Guangzhou, 510650, China. Electronic address: CJsoil@126.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31026701

Citation

Li, Cheng, et al. "Soil Physiochemical Properties and Landscape Patterns Control Trace Metal Contamination at the Urban-rural Interface in Southern China." Environmental Pollution (Barking, Essex : 1987), vol. 250, 2019, pp. 537-545.
Li C, Sun G, Wu Z, et al. Soil physiochemical properties and landscape patterns control trace metal contamination at the urban-rural interface in southern China. Environ Pollut. 2019;250:537-545.
Li, C., Sun, G., Wu, Z., Zhong, H., Wang, R., Liu, X., Guo, Z., & Cheng, J. (2019). Soil physiochemical properties and landscape patterns control trace metal contamination at the urban-rural interface in southern China. Environmental Pollution (Barking, Essex : 1987), 250, 537-545. https://doi.org/10.1016/j.envpol.2019.04.065
Li C, et al. Soil Physiochemical Properties and Landscape Patterns Control Trace Metal Contamination at the Urban-rural Interface in Southern China. Environ Pollut. 2019;250:537-545. PubMed PMID: 31026701.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Soil physiochemical properties and landscape patterns control trace metal contamination at the urban-rural interface in southern China. AU - Li,Cheng, AU - Sun,Ge, AU - Wu,Zhifeng, AU - Zhong,Honglin, AU - Wang,Rongping, AU - Liu,Xiaonan, AU - Guo,Zhixing, AU - Cheng,Jiong, Y1 - 2019/04/15/ PY - 2018/12/13/received PY - 2019/04/10/revised PY - 2019/04/13/accepted PY - 2019/4/27/pubmed PY - 2019/7/26/medline PY - 2019/4/27/entrez KW - Heavy metal KW - Landscape pattern KW - Soil contamination KW - Soil property KW - Urban-rural interface SP - 537 EP - 545 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 250 N2 - This study examined the influences of three subsets of environmental factors (i.e. soil physicochemical properties including pH, organic matters and soil texture, landscape patterns, and parent materials) on the spatial variations and sources of soil trace metal contamination across an urban-rural environmental gradient in Guangzhou City, southern China. We collected 318 surface soil samples from forests, orchards, farmlands, and urban lawns using a random tessellation design for selecting sample sites. The geo-accumulation indices showed that 18%-88% of soil samples were contaminated: moderate to high contamination with Cd and Hg, low to moderate contamination with Cu, Pb, Zn and Ni, and low contamination with As and Cr. However, less than 13% of soil samples were considered to have exceeded the national standards causing environmental and human health concerns. The mean geo-accumulation indices increased in the order of forest, paddy field/orchard, vegetable, road/residential, and park/residential areas for As, Cd, Ni, Pb, Zn, closely following a land disturbance gradient. Spearman Correlation and Cluster Analyses showed that Pb-Cu-Zn had traffic-related origins, Cd-Hg were mainly influenced by fertilization or industrial emissions, and As-Cr-Ni had geogenic origins for agricultural soils. In contrast, the Ni, Hg and Cd contamination sources for urban soils included both anthropogenic and geogenic origins. The Stepwise Regression and Partial Redundancy Analyses showed that three subsets of environmental factors explained 43%-87% of variations of soil contamination for both agricultural and urban soils. We concluded that soil contamination was mainly controlled by soil physiochemical properties followed by landscape patterns. Soil absorption of aerial loads of trace metal pollutants dominated the soil contamination processes. Our findings implied that improving soil physiochemical properties and landscape designs can strengthen environmental buffering and carrying capacity, thus alleviating soil contamination and reducing non-point-source pollution in the study region. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/31026701/Soil_physiochemical_properties_and_landscape_patterns_control_trace_metal_contamination_at_the_urban_rural_interface_in_southern_China_ DB - PRIME DP - Unbound Medicine ER -