Soil Cd concentration related to carbonate background can be predicted by major element concentrations, which is useful for differentiating Cd background from human pollution in the future soil pollution monitoring. Warm and humid climate in forest land helps to enrich Cd during weathering. The high Cd background effect of limestone is higher than that of dolomite and their effects decease with increasing detritus component they contain. The composition of parent rock, climate conditions, and landuse are controlling factors of the enrichment. In the total area (68.9 × 10 3 km 2) with high Cd concentration, 89.8% is related to carbonates.
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Spatially, the high Cd area (Cd > 1.5 m/kg with reference of the GB15618-2018 soil environmental quality in China, 68.9 × 10 3 km 2) coincide well with the carbonate distribution. Summarize function ArcGIS Summarize Within (Analysis)ArcGIS Pro Documentatio. It was found that the RGNR is an ideal data source for regional Cd background studies. This study collected data from the Multi-Purpose Regional Geochemical Survey (MPRGS) and the Regional Geochemistry-National Reconnaissance Program (RGNR) to investigate the extent and its controlling factors based on spatial analysis. However, the extent of the high value background and the geographical factors influencing its spatial distribution are still unknown. Previous studies have found that Cadmium (Cd) may be condensed during the processes of the weathering and soil formation over carbonate bedrock, which is a typical phenomenon in the southwest region of China.
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