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Int. J. Environ. Res. Public Health 2011, 8(2), 374-387; doi:10.3390/ijerph8020374
Article

Field-Scale Spatial Variation of Saline-Sodic Soil and Its Relation with Environmental Factors in Western Songnen Plain of China

1,* , 1
, 1,2
 and 3
Received: 24 November 2010; in revised form: 20 January 2011 / Accepted: 24 January 2011 / Published: 31 January 2011
(This article belongs to the Special Issue Geostatistics in Environmental Pollution and Risk Assessment)
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Abstract: The objectives of this study were to investigate the degree of spatial variability and variance structure of salinization parameters using classical and geostatistical method in Songnen Plain of China, which is one of largest saline-sodic areas in the World, and to analyze the relationship between salinization parameters, including soil salinity content (SC), electrical conductivity (EC), sodium adsorption ratio (SAR), and pH, and seven environmental factors by Pearson and stepwise regression analysis. The environmental factors were ground elevation, surface ponding time, surface ponding depth, and soil moistures at four layers (0–10 cm, 10–30 cm, 30–60 cm, and 60–100 cm). The results indicated that SC, EC, and SAR showed great variations, whereas pH exhibited low variations. Four salinization parameters showed strongly spatial autocorrelation resulting from the compound impact of structural factors. The empirical semivariograms in the four parameters could be simulated by spherical and exponential models. The spatial distributions of SC, EC, SAR and pH showed similar patterns, with the coexistence of high salinity and sodicity in the areas with high ground elevation. By Pearson analysis, the soil salinization parameters showed a significant positive relationship with ground elevation, but a negative correlation with surface ponding time, surface ponding depth, and soil moistures. Both correlation and stepwise regression analysis showed that ground elevation is the most important environmental factor for spatial variation of soil sanilization. The results from this research can provide some useful information for explaining mechanism of salinization process and utilization of saline-sodic soils in the Western Songnen Plain.
Keywords: geostatistic; spatial variability; micro-topography; saline-sodic land; western songnen plain geostatistic; spatial variability; micro-topography; saline-sodic land; western songnen plain
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yang, F.; Zhang, G.; Yin, X.; Liu, Z. Field-Scale Spatial Variation of Saline-Sodic Soil and Its Relation with Environmental Factors in Western Songnen Plain of China. Int. J. Environ. Res. Public Health 2011, 8, 374-387.

AMA Style

Yang F, Zhang G, Yin X, Liu Z. Field-Scale Spatial Variation of Saline-Sodic Soil and Its Relation with Environmental Factors in Western Songnen Plain of China. International Journal of Environmental Research and Public Health. 2011; 8(2):374-387.

Chicago/Turabian Style

Yang, Fan; Zhang, Guangxin; Yin, Xiongrui; Liu, Zhijun. 2011. "Field-Scale Spatial Variation of Saline-Sodic Soil and Its Relation with Environmental Factors in Western Songnen Plain of China." Int. J. Environ. Res. Public Health 8, no. 2: 374-387.


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