地球地壳中潜在有毒元素(PTE)在土壤中的生物利用度,例如,As,Hg,Tl,还有Pb,由于人类活动可能会造成潜在的环境和健康风险,特别是与采矿开采有关。生物监测可以通过在树木等生物体中进行测量来检测PTE污染。然而,选择要分析的植物种类和组织是与PTE吸收和易位有关的评估的关键点。这项工作的目的是评估As,Hg,Tl,板栗和铅的分布。植物组织,鉴于其对生物质和粮食生产的重要性。该研究确定了AlpiApuane(意大利)的两个地点,在相似的环境条件下(例如,高程,暴露,森林类型,和树种),但土壤PTE水平不同。表土的特征是,并测定不同生物利用度的PTE组分。还分析了板栗植物组织中的PTE浓度(叶子,吠叫,木头,坚果,和贝壳)通过确定微量和大量营养素浓度以及叶片C和N同位素组成(δ13C或δ15N),与植物健康状况同时进行评估。栗树表现出良好的健康状况,突出了其对Tl的适用性,As,Hg,和铅生物监测,通过组织特异性PTE分配。在所有植物组织中检测到相似浓度的铊和汞,正如在树叶中发现的那样,木头,和坚果,而铅只在树皮中。δ15N与叶片Mn和Tl浓度呈负相关,表明由于高污染水平和酸性土壤pH值,氮源和/或植物代谢可能发生变化。LaCulla站点树木的Tl与它在碳酸盐岩中的存在有关,而不是在表土中,强调栗子在为地球化学测量提供有价值信息方面的潜力。
Bioavailability of potentially toxic elements (PTEs) from the Earth\'s crust in the soil, e.g., As, Hg, Tl, and Pb, can pose a potential environmental and health risk because of human activities, especially related to mining extraction. The biomonitoring allows to detect PTE contamination through their measurement in living organisms as trees. However, the choice of which plant species and tissue to analyse is a key point to be evaluated in relation to PTE absorption and translocation. The aim of this work was to assess the As, Hg, Tl, and Pb distribution in Castanea sativa Mill. plant tissues, given its importance for both biomass and food production. The study identified two sites in the Alpi Apuane (Italy), with similar environmental conditions (e.g., elevation, exposure, forest type, and tree species) but different soil PTE levels. The topsoil was characterized, and the PTE fractions with different
bioavailability were measured. The PTE concentrations were also analysed in chestnut plant tissues (leaves, bark, wood, nuts, and shells) in parallel with and evaluation of plant health status through the determination of micro and macronutrient concentrations and the leaf C and N isotope composition (δ13C or δ15N). Chestnut trees showed a good health status highlighting its suitability for Tl, As, Hg, and Pb biomonitoring, by a tissue-specific PTE allocation. Thallium and Hg were detected in all plant tissues at similar concentrations, As was found in leaves, wood, and nuts while Pb only in the bark. The δ15N negatively correlated with leaf Mn and Tl concentrations, suggesting possible changes in N source and/or plant metabolism due to the high contamination level and acid soil pH. The Tl in La Culla site trees was associated with its presence in the carbonate rocks but not in the topsoil, highlighting the potentiality of chestnut in providing valuable information for geochemical surveying.