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Volume 19 Issue 4
Aug 2008
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Lei DOU, Yong-zhang ZHOU, Jin MA, Yong LI, Qiu-ming CHENG, Shu-yun XIE, Hai-yan DU, Yuan-hang YOU, Hong-fu WAN. Using Multivariate Statistical and Geostatistical Methods to Identify Spatial Variability of Trace Elements in Agricultural Soils in Dongguan City, Guangdong, China. Journal of Earth Science, 2008, 19(4): 343-353.
Citation: Lei DOU, Yong-zhang ZHOU, Jin MA, Yong LI, Qiu-ming CHENG, Shu-yun XIE, Hai-yan DU, Yuan-hang YOU, Hong-fu WAN. Using Multivariate Statistical and Geostatistical Methods to Identify Spatial Variability of Trace Elements in Agricultural Soils in Dongguan City, Guangdong, China. Journal of Earth Science, 2008, 19(4): 343-353.

Using Multivariate Statistical and Geostatistical Methods to Identify Spatial Variability of Trace Elements in Agricultural Soils in Dongguan City, Guangdong, China

Funds:

the Ministry of Land and Resources of China [2005]011-16

State Environment Protection Administration of China 2001-1-2

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, and the Guangdong Provincial Office of Sciences and Technology via NSF Team Project and Key Project 06202438

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, and the Guangdong Provincial Office of Sciences and Technology via NSF Team Project and Key Project 2004A3030800

More Information
  • Corresponding author: Zhou Yongzhang, E-mail: houyz@mail.sysu.edu.cn
  • Received Date: 28 Mar 2008
  • Accepted Date: 30 May 2008
  • Dongguan (东莞) City, located in the Pearl River Delta, South China, is famous for its rapid industrialization in the past 30 years. A total of 90 topsoil samples have been collected from agricultural fields, including vegetable and orchard soils in the city, and eight heavy metals (As, Cu, Cd, Cr, Hg, Ni, Pb, and Zn) and other items (pH values and organic matter) have been analyzed, to evaluate the influence of anthropic activities on the environmental quality of agricultural soils and to identify the spatial distribution of trace elements and possible sources of trace elements. The elements Hg, Pb, and Cd have accumulated remarkably here, incomparison with the soil background content of elements in Guangdong (广东) Province. Pollution is more serious in the western plain and the central region, which are heavily distributed with industries and rivers. Multivariate and geostatistical methods have been applied to differentiate the influences of natural processes and human activities on the pollution of heavy metals in topsoils in the study area. The results of cluster analysis (CA) and factor analysis (FA) show that Ni, Cr, Cu, Zn, and As are grouped in factor F1, Pb in F2, and Cd and Hg in F3, respectively. The spatial pattern of the three factors may be well demonstrated by geostatistical analysis. It is shown that the first factor could be considered as a natural source controlled by parent rocks. The second factor could be referred to as "industrial and traffic pollution sources". The source of the third factor is mainly controlled by long-term anthropic activities, as a consequence of agricultural activities, fossil fuel consumption, and atmospheric deposition.

     

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