Geochemical soil atlas of Switzerland: Magnesium

Interpolated element concentrations (mg/kg fine soil) in the topsoil (0-20 cm) of Switzerland. For the Ordinary Kriging interpolations (1 km x 1 km), measurement data from a total of 1,201 sites of the Swiss Biodiversity Monitoring, the National Soil Monitoring and the European Geochemical Soil Atlas were taken into account. The element concentrations were analyzed in aqua regia digests (HNO₃:HCl:H₂O) of dried (40°C), sieved (< 2 mm) and subsequently ground soil samples using inductively coupled plasma mass spectrometry. Sites with known anthropogenic overprinting of element concentrations (point sources) were excluded in advance. The results of the geochemical soil atlas are a snapshot of the element concentrations in the topsoils of Switzerland (sampling period 2011-2015). The interpolated maps serve to improve the visualization of regions with elevated or low concentrations. However, no plot-specific information or definitive conclusions on the geology, bioavailability, percentage distribution of geogenic and anthropogenic sources or soil contamination can be derived from them. Citation of the publication: J. E. Reusser, M. B. Siegenthaler, L. H. E. Winkel, D. Wächter, R. Kretzschmar, R. G. Meuli: Geochemischer Bodenatlas der Schweiz. Agroscope; Zürich, 2023.瑞士表层土壤（0-20 cm）中插值得到的元素浓度（单位：mg/kg细土）。针对分辨率为1 km×1 km的普通克里金（Ordinary Kriging）插值，研究纳入了瑞士生物多样性监测、国家土壤监测以及欧洲地球化学土壤图集共计1201个采样点的实测数据。本研究对经40℃烘干、过2 mm筛后研磨的土壤样品，采用王水（aqua regia，HNO₃:HCl:H₂O）消解，并通过电感耦合等离子体质谱法（inductively coupled plasma mass spectrometry）测定元素浓度。预先排除了已知存在元素浓度人为叠加影响（点源污染）的采样点。欧洲地球化学土壤图集的结果为瑞士表层土壤元素浓度的一次快照式调查（采样周期为2011-2015年）。插值得到的分布图旨在提升浓度偏高或偏低区域的可视化效果。但据此无法获取针对特定样地的信息，也无法得出关于土壤地质背景、元素生物有效性、地质成因与人为来源占比分布，或土壤污染状况的确定性结论。引用文献：J. E. Reusser、M. B. Siegenthaler、L. H. E. Winkel、D. Wächter、R. Kretzschmar、R. G. Meuli：《瑞士地球化学土壤图集（Geochemischer Bodenatlas der Schweiz）》，Agroscope；苏黎世，2023年。