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Published online 25 May 2007
Published in J Environ Qual 36:935-942 (2007)
DOI: 10.2134/jeq2006.0184
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Right arrow Watershed and Landscape Processes
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Geostatistical Analysis and Risk Assessment on Soil Total Nitrogen and Total Soil Phosphorus in the Dongting Lake Plain Area, China

Peng Lua, Yirong Sub, Zheng Niua and Jinshui Wub,*

a The State Key Lab. of Remote Sensing Science, Jointly Sponsored by the Inst. of Remote Sensing Applications, Chinese Academy of Sciences and Beijing Normal Univ., Beijing 100101, P.R. China
b The Inst. of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P.R. China


Figure 1
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  		Fig. 1. Sampling diagram of soil nutrients in Dongting Lake area in subtropical area, China.

 

Figure 2
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  		Fig. 2. Plots of local variances versus local means computed from 600 by 600 m moving windows overlaid across the study area. (A) Total soil nitrogen. (B) Total soil phosphorus.

 

Figure 3
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  		Fig. 3. Box-Cox normality plots of (A) total soil nitrogen and (B) total soil phosphorus. The horizontal axis represents the value of the {lambda} transformation parameter. The vertical axis refers to the correlation coefficient.

 

Figure 4
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  		Fig. 4. Isotropic semi-variogram of (A) total soil nitrogen and (B) total soil phosphorus.

 

Figure 5
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  		Fig. 5. Anisotropic ratio of (A) total soil nitrogen and (B) total soil phosphorus at different directions. K(h), ratio of anisotropy in different directions.

 

Figure 6
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  		Fig. 6. Spatial distribution pattern of (A) total soil nitrogen (TN) and (B) total soil phosphorus (TP).

 

Figure 7
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  		Fig. 7. Kriging SD (KSD) of (A) total soil nitrogen and (B) total soil phosphorus.

 

Figure 8
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  		Fig. 8. Probability distribution map of (A) total soil nitrogen (TN) and (B) total soil phosphorus (TP) exceeding the threshold value (TN, 3.2 g/kg; TP, 1.05 g/kg).

 




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Copyright © 2007 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.