Assuming that strontium (Sr) isotope ratios in trees mirror the bedrock isotope signal, between-site ⁸⁷Sr/⁸⁶Sr comparisons can serve as a powerful tool in archaeological wood provenance studies. Here we discuss the strengths and weaknesses of this approach using Sr isotope data for bedrock, trees and rainfall collected at seven sites in the Czech Republic. The study included basalt, durbachite, granite, paragneiss, limestone and phyllitic slate. The range of ⁸⁷Sr/⁸⁶Sr ratios of these bedrock types was extremely large (0.704–1.743). The investigated tree species included oak, pine, and spruce. Within-tree variability in ⁸⁷Sr/⁸⁶Sr ratios (~0.010) was two orders of magnitude smaller than the variability in Sr ratios across the studied bedrock types. Oak and pine growing on identical bedrock exhibited statistically indistinguishable ⁸⁷Sr/⁸⁶Sr ratios. In four types of spruce tissues from a particular site, the ⁸⁷Sr/⁸⁶Sr ratios were indistinguishable, while significantly different from spruce tissues at another site. The ⁸⁷Sr/⁸⁶Sr ratios of the wood differed from those of bedrock, converging to the ⁸⁷Sr/⁸⁶Sr ratio of rainfall (0.709–0.714). Even at a 450-km distance from the nearest sea, atmospheric Sr partly originated from sea-spray. Incorporation of atmospheric Sr in trees often results in overlapping ⁸⁷Sr/⁸⁶Sr ranges and hampers source identification of archaeological wood.

假设树木中的锶 (Sr) 同位素比率反映了基岩同位素信号，站点间⁸⁷ Sr/ ⁸⁶ Sr 的比较可以作为考古木材来源研究的有力工具。在这里，我们使用在捷克共和国七个地点收集的基岩、树木和降雨的 Sr 同位素数据讨论了这种方法的优缺点。该研究包括玄武岩、硬长石、花岗岩、副片麻岩、石灰石和千页岩板岩。这些基岩类型的⁸⁷ Sr/ ⁸⁶ Sr 比率范围非常大（0.704-1.743）。调查的树种包括橡树、松树和云杉。⁸⁷ Sr/ ⁸⁶的树内变异性Sr 比率 (~0.010) 比研究的基岩类型中 Sr 比率的变异性小两个数量级。生长在相同基岩上的橡树和松树表现出统计学上无法区分的⁸⁷ Sr/ ⁸⁶ Sr 比率。在来自特定地点的四种类型的云杉组织中，⁸⁷ Sr/ ⁸⁶ Sr 的比率无法区分，而与其他地点的云杉组织显着不同。木材的⁸⁷ Sr/ ⁸⁶ Sr 比率与基岩的比率不同，趋同于⁸⁷ Sr/ ⁸⁶降雨量 Sr 比率 (0.709–0.714)。即使距离最近的大海 450 公里，大气中的 Sr 也部分来自海喷雾。大气中 Sr 掺入树木通常会导致⁸⁷ Sr/ ⁸⁶ Sr 范围重叠，并妨碍考古木材的来源鉴定。