Spatial distribution of heavy metal concentrations in peri-urban soils in eastern China

被引:40
|
作者
Li, Shoujuan [1 ,2 ]
Yang, Lei [1 ,2 ]
Chen, Liding [1 ,2 ]
Zhao, Fangkai [1 ,2 ]
Sun, Long [1 ]
机构
[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Heavy metals; Peri-urban; Land use; Human activities; Spatial variability; YANGTZE-RIVER DELTA; HEALTH-RISK ASSESSMENT; URBAN-RURAL GRADIENT; DIFFERENT LAND USES; ECOSYSTEM SERVICES; AGRICULTURAL SOILS; INDUSTRIAL-AREA; SURFACE SOIL; CONTAMINATION; ACCUMULATION;
D O I
10.1007/s11356-018-3691-6
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Complex land use patterns and intense human activities significantly affect the spatial distribution of heavy metals in soils. This is especially true in peri-urban areas. The land use in peri-urban areas is complex and the risk of heavy metal pollution is relatively high. Identifying the correlations between land use patterns and spatial distribution of heavy metals in peri-urban soils is important for enhancing soil security and sustaining soil ecosystem services in areas undergoing rapid urbanisation. In this study, soil samples were collected from 82 experimental sites in a typical peri-urban watershed in eastern China. Copper (Cu), zinc (Zn), cadmium (Cd), nickel (Ni), arsenic (As), chromium (Cr), lead (Pb) and mercury (Hg) concentrations at different soil depths were analysed. Results showed that heavy metal concentrations in peri-urban soils were significantly affected by land use type and varied with soil depth. Farmland had the highest heavy metal concentrations, whereas forestland had the lowest concentrations; the concentrations in soils decreased with increasing soil depth. Spatial analysis of heavy metals in soils showed that their concentrations rapidly increased with the increasing percentage of town areas in buffer zones. This indicated that land use structure influenced the heavy metal concentrations in peri-urban soils and the influences were correlated to the locations of towns and villages. Correlation analysis showed that Cu, Zn, Cd, Pb and Hg concentrations in soils were significantly affected by altitude, distance from roads, distance from towns and villages and soil clay content. Interestingly, historic land use was also found to affect heavy metal concentrations in forestland. These results can provide scientific guidance for designing effective soil management practices for peri-urban areas.
引用
收藏
页码:1615 / 1627
页数:13
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