4.6 Article

Spatial variability of soil Cd content based on IDW and RBF in Fujiang River, Mianyang, China

期刊

JOURNAL OF SOILS AND SEDIMENTS
卷 21, 期 1, 页码 419-429

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11368-020-02758-1

关键词

Cadmium; Spatial variability; IDW; RBF

资金

  1. National Natural Science Foundation of China [41572302]
  2. School-based Research of City College, Southwest University of Science and Technology [2019XJXM43]

向作者/读者索取更多资源

The study aimed to determine the most accurate soil Cd interpolation method for spatial distribution analysis in Santai County, Sichuan Province. The results showed that Cd content decreased with depth in the 0-50 cm soil layer, with stronger spatial autocorrelation observed in the IDW method for areas influenced by human activities. The RBF method was superior for evaluating the spatial distribution of soil Cd content in this region.
Purpose Establishing the spatial distribution of soil properties in agro-ecosystems is critical to increasing the productivity of intensive tillage soils and reducing environmental pressure. Thus, a comprehensive understanding of soil's heavy metal distribution characteristics is important for optimal management. The goal of this study was to determine the most accurate soil Cd interpolation method for the study area and analyze the variation and spatial distribution of Cd content with depth. Materials and methods In this work, we employed two common spatial interpolation methods-inverse distance weighting (IDW) and radial basis function (RBF)-in conjunction with a geographic information system (GIS) to interpolate sampling data of the heavy metal cadmium (Cd) throughout Santai County; a locale in the lower part of Fujiang River, Mianyang, in the northeast of Sichuan Province. Results and discussion The results of our investigation are as follows. (1) At depths of 0-50 cm, the Cd content decreased with depth while the coefficient of variation (Cv) increased with depth. The exponential model and the Gauss model adequately described the Cd content's spatial autocorrelation and the determination coefficient (R-2) varied within 0.747-0.962, indicating that the model had high precision. (2) With respect to the accuracy of the IDW and RBF methods, IDW was more accurate than the RBF in the 0-20 cm soil layer, yet the reverse was found in the 20-50 cm soil layer. (3) Three-dimensional spatial distribution maps-constructed using the RBF and IDW methods at different soil depths-showed that the RBF method provided a greater smoothing effect than the IDW method. Conclusions The spatial variability of soil Cd content shows that: (1) the Cd content's spatial autocorrelation was strong in the 0-50 cm soil layer. (2) The IDW method is suitable for areas that are greatly influenced by human or farming activities while the RBF method is appropriate for areas that are greatly influenced by internal soil factors. The RBF is superior for evaluating the spatial distribution of soil Cd content in this area.

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