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Published online 1 May 2008
Published in J Environ Qual 37:780-787 (2008)
DOI: 10.2134/jeq2007.0154
© 2008 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Spatial Distributions and Potential Risk Analysis of Total Soil Selenium in Guangdong Province, China

H. H. Zhanga,b,c, Z. F. Wua,c,*, C. L. Yanga, B. Xiab, D. R. Xub and H. X. Yuana

a Guangdong Inst. of Eco-environmental and Soil Sciences, 510650, Guangzhou, China
b CAS Key Lab. of Marginal Sea Geology, Guangzhou Inst. of Geochemistry, Chinese Academy of Sciences, 510640, China
c State Key Lab. of Soil and Sustainable Agriculture, Inst. of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China


Figure 1
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  		Fig. 1. Location of Guangdong Province, China (A), geological sketch indicating the distribution of parent rocks (B), and sampling locations (C). Number 1 is the Beijiang River, 2 is the Xijiang River, 3 is the Dongjiang River, 4 is the Huanjiang River, and 5 is the Jianjiang River.

 

Figure 2
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  		Fig. 2. Distribution frequency of selenium concentration in A-, B-, and C-horizon soils in Guangdong Province, China. Left: original data; right: log10-transformed data.

 

Figure 3
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  		Fig. 3. Semivariograms of selenium concentration in A-, B-, and C-horizon in Guangdong Province, China, obtained by spherical model.

 

Figure 4
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  		Fig. 4. Lognormal probability plot for total selenium concentration in surface soils (A-horizon soil) in Guangdong Province, China.

 

Figure 5
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  		Fig. 5. Spatial distributions of selenium concentrations in A-, B-, and C-horizon soils in Guangdong Province, China. Red line areas (<0.125 mg kg–1): selenium deficiency areas; yellow line areas (0.125–0.175 mg kg–1): selenium marginal areas; green line areas (0.175–0.4 mg kg–1): selenium medium areas; outer areas of green line (>0.4 mg kg–1): selenium adequate areas.

 

Figure 6
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  		Fig. 6. Scatter diagrams showing correlation for soil selenium in A-, B-, and C-horizon soils

 




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