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Spatial distribution of heavy metals of agricultural soils in Dongguan, China

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Distribution and speciation of heavy metals of agricultural soils(85 surface soil samples and 4 soil profiles) in Dongguan were investigated, while total Cr, Cu, Ni, Pb, Zn(abbreviated as Cr, Cu, Ni, Pb, Zn) and available Cu, Zn(Av-Cu, Av-Zn) were analyzed by a flame absorption spectrophotometer(AAS), and total Cd(Cd) was analyzed using graphite furnace AAS. The content of Cd, Cu and Ni was partially much more than the second grade of GB15618-1995 even though the mean contents of all heavy metal were less than the threshold value of the second grade and only the mean content of Pb was more than the value of national background. Results of descriptive statistic showed that the mean content of heavy metals should depend on land utilization and spatial location at some extent. The heavy metal contents were higher in the Southwest and Northwest than in the Central. In addition, the mean contents of Zn and Pb in Dongguan paddy soils were significantly higher than those of Pearl River Delta(PRD) and Taihu Lake region(TLR). Correlation analyses indicated that there existed significant correlation between Cr and Ni in orchard soils, and among Zn, Cd and Cu, between Av-Cu and Cu, between Av-Zn and Cr, Ni, pH value in vegetable soils, and a weak relationship between Cd, Cu and Pb, between Av-Zn and Zn. Principal component analyses(PCA) showed that the order of importance should be Zn> Pb> Cr> Ni> Cu.

heavy metalspatial distributionagricultural soilDongguan

XIA Yun-sheng、LI Fang-bai、WAN Hong-fu、MA Jin、YANG Guo-yi、ZHANG Tian-bin、LUO Wei

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Guangdong Institute of Eco-Environment and Soil Sciences, Guangdong Key Laboratory of Integrated Control of Agro-environment, Guangzhou 510650, China

State Environmental Protection Administration of China and Guangdong Environmental Protection AgencyGuangdong Key Laboratory of Integrated Control of Agro-Environment China

2001-1-2,2001-082KB07211T

2004

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

CSTPCDCSCDSCI
影响因子：0.862
ISSN：1001-0742
年,卷(期)：2004.16(6)
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