由于母质和土壤形成过程的复杂特征,土壤重金属分布表现出区域异质性,强调在评估土壤风险之前需要适当的区域标准。本研究以海南岛为研究对象,利用多功能区域地球化学调查数据集,采用迭代法建立土壤重金属地球化学基线和背景值。地理探测器分析表明,母体材料是影响重金属分布的主要因素,其次是土壤类型和土地利用。建立了该岛三个环境和行政区域的重金属地球化学基线值。值得注意的是,通用的地球化学基线值不能充分代表重金属分布的区域变化,母体材料在各种情况下都起着至关重要的作用。基于母材的当地适用值对海南岛最具代表性。这项研究为开发特定区域的土壤重金属评估环境基线值提供了参考框架。
Soil heavy metal distributions exhibit regional heterogeneity due to the complex characteristics of parent materials and soil formation processes, emphasizing the need for appropriate regional standards prior to assessing soil risks. This
study focuses on Hainan Island and employs the Multi-purpose Regional Geochemical Survey dataset to establish heavy metal geochemical baseline and background values for soil using an iterative method. Geographical detector analysis reveals that parent materials are the primary factor influencing heavy metal distribution, followed by soil types and land use. Heavy metal geochemical baseline values are established for the island\'s three environments and administrative regions. Notably, a universal geochemical baseline value cannot adequately represent regional variations in heavy metal distribution, with parent materials playing a crucial role in various scenarios. Locally applicable values based on parent material are the most representative for Hainan Island. This
study provides a reference framework for developing region-specific environmental baseline values for soil heavy metal assessments.