Lead Accumulation in Soils under Different Land Use Types in Beijing City
Received date: 2005-02-19
Revised date: 2005-06-27
Online published: 2005-09-25
Supported by
National Science Fund for Distinguished Young Scholars, No.40325003; Project of Natural Science Foundation of Beijing, No.6990002
To obtain an overview of land use effects on the accumulation of Pb in the soil, 600 samples were collected from Beijing. The results showed that the geometric mean of all soil samples was 26.6 mg/kg, significantly higher than the background concentration of Beijing soil (24.6 mg/kg). Based on the assessment compared with background concentration, increasing of Pb was found to be the highest in greenbelt and orchard and to a somewhat lesser extent in vegetable field and paddy field, whereas anthropogenic input seemed to be less important in natural soil. And the concentrations of Pb in greenbelt and orchard were significantly higher than those in other land use types. Using baseline as the criterion, the orchard showed the highest ratio beyond the limit for 21.4%. Corresponding values of greenbelt, vegetable field, paddy field, and cornfield were 18.2%, 11.1%, 8.3% and 5.2%, respectively and 7.2% for the total samples. The samples over the limit were mainly distributed in districts of Changping, Chaoyang, Daxing, Fengtai, Haidian and Shijingshan. The six districts were attributed with high ratios beyond the baseline limit for soil samples. Therefore, the concentrations of Pb in the soils declined gradually with the increment of the distance of the soils from the city zone. Through present investigation, it was found that the impacts of human activities of atmospheric precipitation, landfill of waste and fertilizer application are probably the important reasons for Pb concentrations under different land-use types.
Key words： land use type; soil; heavy metal; Pb; Beijing; land fill
ZHENG Yuanming, CHEN Tongbin, CHEN Huang, ZHENG Guodi, LUO Jinfa . Lead Accumulation in Soils under Different Land Use Types in Beijing City[J]. Acta Geographica Sinica, 2005 , 60(5) : 791 -797 . DOI: 10.11821/xb200505010
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