Establishment of Diffusion Characteristics Extraction Model of Heavy Metal Pollution in Agricultural Soil

Wen Huang, Yinfeng Xu

Ekoloji, 2019, Issue 108, Pages: 629-633


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The patterns of heavy metal pollution in agricultural soils in China are diverse, and the risk of regional pollution is prominent. Heavy metal pollution mainly includes strong spatial heterogeneity of heavy metals in soil, large differences in heavy metal accumulation between soil types and crop varieties, serious soil acidification, imbalance of soil elements, difficulty in reversing the trend of heavy metal accumulation in soil, insignificant linear relationship between soil and crop in heavy metal accumulation, imperfect remediation technology, and lack of long-term risk control mechanism of remediation measures. In order to further clarify the diffusion characteristics of heavy metal pollution in agricultural soils, based on a large number of spatial distance data and heavy metal content data, Kriging interpolation method is used to draw the spatial distribution map of heavy metal elements and establish a spatial distribution model. At the same time, the mathematical model of heavy metal pollution degree in agricultural soil surface is established. The pollution degree of agricultural soil is evaluated by Nemerow comprehensive index method and single pollution index method, and the main cause of heavy metal pollution is found to be industrial activities. Finally, the convection-dispersion-adsorption equation model of heavy metal pollutants in agricultural soils is established by analyzing the main characteristics of heavy metal pollutants in the process of transmission.


agricultural soils, heavy metal pollution, Kriging interpolation method, Nemerow composite index method


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