The accumulation of potentially toxic elements (PTEs) in terrestrial ecosystems has become a global concern, as PTEs may exert a wide range of negative impacts on forest’s ecological state due to local or transboundary pollution. Forest vegetation and soil display great potential as means of coping with the accumulation mechanisms, absorption and dissolving the pollutants. Therefore, it is crucial to study the transfer of PTEs across these basic components of the forest ecosystem. Investigation on the PTEs concentrations in the soil–plant system in relatively non-polluted environment of Central Balkan National Park (Sredna Stara Planina Mountain) provides more information about the role of the forest patterns and soil properties for the bioaccumulation processes in the context of ecosystem services concept. In this paper, the transfer of PTEs in soil–plant system in relatively clean environment is studied in order to assess and map the ecosystem capacity of different types of forest ecosystems to mediate toxic elements. Based on in situ observations and sampling, the PTEs concentrations in soil and aboveground vegetation were analyzed. The potential of each forest type to reduce the impact of PTEs and bioaccumulation as an indicator of ecosystem service is also discussed. The GIS analysis supports the study by creating a common database and setting the basis for ecosystem services assessment. The generated maps represent areas where the forest ecosystems have the greatest capacity to provide related ecosystem service and mediate toxic elements. The bioaccumulation of PTEs in forest territories results in medium to low rates and higher supply capacity is not present at any spatial unit as the accumulation process is focused in the soil. The obtained results highlight the ecological importance of soil in terms of acting as a buffer against pollution, especially in areas with intensive road traffic.

陆地生态系统中潜在有毒元素（PTEs）的积累已成为全球关注的问题，因为 PTEs 可能由于当地或跨界污染对森林生态状况产生广泛的负面影响。森林植被和土壤作为应对污染物积累机制、吸收和溶解的手段显示出巨大的潜力。因此，研究 PTE 在森林生态系统的这些基本组成部分之间的转移至关重要。对中巴尔干国家公园（Sredna Stara Planina Mountain）相对未污染环境中土壤-植物系统中 PTEs 浓度的调查提供了有关森林格局和土壤性质在生态系统背景下生物积累过程中的作用的更多信息服务理念。在本文中，为了评估和绘制不同类型森林生态系统介导有毒元素的生态系统能力，研究了相对清洁环境中土壤-植物系统中 PTEs 的转移。基于现场观察和采样，分析了土壤和地上植被中的 PTEs 浓度。还讨论了每种森林类型作为生态系统服务指标减少 PTE 和生物累积影响的潜力。GIS 分析通过创建一个通用数据库并为生态系统服务评估奠定基础来支持这项研究。生成的地图代表了森林生态系统最有能力提供相关生态系统服务和调解有毒元素的区域。PTE 在森林地区的生物积累导致中低速率，并且在任何空间单元都不存在更高的供应能力，因为积累过程集中在土壤中。获得的结果突出了土壤作为污染缓冲的生态重要性，特别是在道路交通密集的地区。