Strontium isotopes (⁸⁷Sr/⁸⁶Sr) provide valuable information to help reconstruct past mobility. For the analysis of archaeological tooth enamel to provide a direct assessment of mobility, a comparison to the baseline ⁸⁷Sr/⁸⁶Sr in a region is required. In this study, a large-scale ⁸⁷Sr/⁸⁶Sr baseline of Portugal is created based on 151 paired plant and soil leachate samples combined with previously published data (20 additional plant and 33 additional soil leachate sites). Spatial patterns of ⁸⁷Sr/⁸⁶Sr are evident, following Portugal's geology and terrain, with higher ⁸⁷Sr/⁸⁶Sr in the granite dominated north and further inland. Influences from sea spray are observed along the coastal regions of the country. The bioavailable strontium range for Portugal is 0.70575–0.73487, and paired plant-soil leachate site measurements show a strong positive relationship. Empirical Bayesian Kriging (EBK) alongside mean ⁸⁷Sr/⁸⁶Sr per geological unit are used to provide predictive surfaces for bioavailable ⁸⁷Sr/⁸⁶Sr. We find that the addition of archaeological site-specific measurements is required in archaeological mobility studies to ensure local-scale ⁸⁷Sr/⁸⁶Sr variation is captured, illustrated in this study using the Late Middle Neolithic to Early Bronze Age site of Perdigões. The bioavailable strontium isoscape for Portugal provides a baseline map for future archaeological and palaeoecological studies in this region and contributes to the global efforts to map strontium isotope variability.

锶同位素 ( ⁸⁷ Sr/ ⁸⁶ Sr) 提供有价值的信息来帮助重建过去的流动性。为了对考古牙釉质进行分析以提供对流动性的直接评估，需要与某个区域的基线⁸⁷ Sr/ ⁸⁶ Sr 进行比较。在这项研究中，葡萄牙的大规模⁸⁷ Sr/ ⁸⁶ Sr 基线是基于 151 个配对的植物和土壤渗滤液样本以及先前公布的数据（20 个额外的植物和 33 个额外的土壤渗滤液位点）创建的。⁸⁷ Sr/ ⁸⁶ Sr 的空间格局明显，遵循葡萄牙的地质和地形，⁸⁷ Sr/ ^86较高花岗岩中的 Sr 在北部和更远的内陆地区占主导地位。在该国沿海地区观察到海浪的影响。葡萄牙的生物可利用锶范围为 0.70575–0.73487，配对的植物-土壤渗滤液现场测量显示出强烈的正相关关系。经验贝叶斯克里金法 (EBK) 以及每个地质单元的平均⁸⁷ Sr/ ⁸⁶ Sr 用于为生物可利用的⁸⁷ Sr/ ⁸⁶ Sr 提供预测表面。我们发现，在考古流动性研究中需要添加特定于考古地点的测量，以确保局部-规模⁸⁷ Sr/ ⁸⁶捕获了 Sr 变异，本研究使用 Perdigões 的新石器时代晚期至青铜时代早期遗址进行了说明。葡萄牙的生物可利用锶等值景观为该地区未来的考古和古生态研究提供了基线图，并有助于全球绘制锶同位素变异性的努力。