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| Spatio-temporal Variation of Soil Heavy Metals in Agricultural Land in Beijing, China |
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| KeyWord:soil heavy metals; spatio-temporal variation; risk ranking; Beijing |
| Author Name | Affiliation | | WANG Bin-wu | Key Laboratory of Land Quality, Ministry of Land and Resources, College of Resources and Environment, China Agricultural University, Beijing 100193, China | | LI Hong | Institute of Comprehensive Research, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | JIANG Hong-qun | Key Laboratory of Land Quality, Ministry of Land and Resources, College of Resources and Environment, China Agricultural University, Beijing 100193, China | | SUN Dan-feng | Key Laboratory of Land Quality, Ministry of Land and Resources, College of Resources and Environment, China Agricultural University, Beijing 100193, China |
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| Abstract: |
| In this study, temporal and spatial variation of soil heavy metals were analyzed from 1985 to 2006 in Beijing. The contents and their spatial distribution of Cr, Ni, Zn and Hg were analyzed by comparing the interpolating maps, while environmental risks of As, Cu, Pb and Cd were evaluated using Hakanson potential ecological risk index. Indicator Kriging was employed to draw the probability distribution maps of the risk and to analyze the spatial distribution information. Heavy metal contents in the soils of Beijing were still at reasonable level, but showed certain accumulation between 1985 and 2006 due to urbanization and intensive agriculture, with Hg accumulating greatest. During 1985—2006, the spatial distribution remained almost unchanged for Cr, Ni, Zn, and As, while the scope of Hg, Cd, Pb, and Cu pollution expanded. These metals still had low environmental risks, though the most dramatic changes occurred in Miyun, Pinggu, Daxing and their urbanized areas. |
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