Abstract
Quantitative analysis of the factors influencing heavy metal migration could be useful for controlling heavy metal migration. In this paper, a geographical detector was used to calculate the contributions of and interactions among factors in Huanjiang County, South China, covering an area of 273 km2. In this paper, nine factors were analyzed. The results showed that, among these factors, soil type was the main factor influencing the migration of As, Pb and Cd; the other eight factors did not have big differences and were lower than soil type. In addition, there were obvious synergistic effects between the soil type and concentration of water-soluble heavy metals (CWS) and the concentration of water-insoluble heavy metals (CWI) and NDVI. Therefore, these factors of the study area were especially focused on. Furthermore, the results of the key factor identification and the high-risk region identification in the nine factors were reliable, based on the geographical detector software. Therefore, the geographical detector software could be used as an effective tool to quantitatively analyze the contribution of the factors, and identify the high-risk regions for the factors influencing soil heavy metal lateral migration in rainfalls.
Highlights
Heavy metals in soil affect the soil quality [1,2], but can migrate laterally through runoff and sediment transport with rainfall [3]
SustaiBnaabsileitdy 2o0n17t,h9e, 1f2a2c7tor detector of the geographical detector software, the contributions of nine fa7ctoofr1s3 on the migration of As, Pb and Cd are shown in Table 1 and Figure 3
The spatial correlations of concentration of water-soluble heavy metals (CWS), normalized difference vegetation index (NDVI), CT, and land-use type with the Pb migration quantity were strong, following soil type; this result was similar to the calculation result from the geographical detector
Summary
Heavy metals in soil affect the soil quality [1,2], but can migrate laterally through runoff and sediment transport with rainfall [3]. Land-use type and vegetation coverage could affect soil properties and soil contamination [15] These factors can all affect the migration quantity of heavy metals, this study investigated which factor(s) had the greatest impact and should be considered first, and whether they had synergistic effects between them. After the key factors were identified, for a certain factor, it was investigated which regions had the highest risks of heavy metal migration. Quantitative analysis of factors influencing soil heavy metal migration is important to identify the key factors and the high-risk regions for a certain factor. These results are useful to control and reduce heavy metal lateral migration
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