Abstract
It is extremely important to explore the heavy metal content and spatial distribution in different cultivated soils. In our study, cokriging (COK) method was used to investigate the relationship between heavy metals and land use types. A total of six heavy metals including Zn, Fe, Cu, Mn, B, S were selected to forecast the heavy metals in cultivated soils. Five types of cultivated land were considered in the study area, including vegetable land, irrigated land, irrigated paddy field, dry land, orchard. Test of normality was firstly carried out to assure that higher prediction accuracy can be obtained, and then correlation analysis and analysis of variance (ANOVA) were performed to find out the most sensitive heavy metals for spatial interpolation. The analysis results showed that Zn, Cu and Fe were the primary heavy metals in soil of the study area. It was obvious that the effect of Mn and Fe were much greater caused by land use types, while they were smaller for B and S. Three errors of mean standard (MS), root mean square error (RMSE), and root mean square standardized error (RMSSE) were derived to assess the prediction accuracy. In comparison with ordinary kriging (OK), the MS of COK approached to 1, the RMSE was much smaller and the RMSSE also approached to 1, which showed that COK can make better predictions than OK.
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Acknowledgements
This work was supported by and Anhui Provincial Major Scientific and Technological Special Project (17030701062), National Key Research and Development Program of China (2016YFD0800904), Fund for “Integration of Cloud Computing and Big Data, Innovation of Science and Education” (2017A10014), and Application Research of Anhui Provincial Public Welfare Technology on Linkage Projects (1704f0704059).
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Zhao, J., Liu, C., Song, Q., Jiang, Y., Hong, Q., Huang, L. (2018). Mapping Heavy Metals in Cultivated Soils Based on Land Use Types and Cokriging. In: Yuan, H., Geng, J., Liu, C., Bian, F., Surapunt, T. (eds) Geo-Spatial Knowledge and Intelligence. GSKI 2017. Communications in Computer and Information Science, vol 848. Springer, Singapore. https://doi.org/10.1007/978-981-13-0893-2_32
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DOI: https://doi.org/10.1007/978-981-13-0893-2_32
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