Tepanosyan Gevorg, Pipoyan Davit, Beglaryan Meline, Sahakyan Lilit
Center for Ecological-Noosphere Studies of NAS RA, Abovyan 68, 0025, Yerevan, Armenia.
Center for Ecological-Noosphere Studies of NAS RA, Abovyan 68, 0025, Yerevan, Armenia.
Chemosphere. 2022 Nov;306:135492. doi: 10.1016/j.chemosphere.2022.135492. Epub 2022 Jun 24.
Soil geochemical data is compositional. Hence the studies targeting the potential of accumulation of toxic elements (TE) in plants have to consider the compositional nature of soil chemical environment. In this study, the combined application of compositional data analysis and geospatial mapping was used to investigate Pb geochemical associations in agricultural soils, revealing the link between these associations and Pb contents in plants, as well as identifying source-specific transfer of Pb from soil to plants. The obtained results showed that soil chemical composition was conditioned by the geological peculiarities of the study area and the potential sources of chemical elements' release. Particularly, k-means clustering and CoDa-biplot allows to identify three distinct subsamples and the application of HCA showed that both Pb soil and plants contents were in the same cluster in all subsamples. However, the geochemical association of elements in subsamples I and III suggested that Pb contents in plants were conditioned by the geochemical behaviors of carbonates whereas in subsample II Pb plant contents were presented in a geochemical association (K, Rb, Pb, and Zn) typical for both fertilizers and the potassium feldspar. The transfer factor (TF) for the comparatively higher values is observed for the subsample linked to K, Rb, Pb, and Zn geochemical association. At the same time, the negative influence of carbonates on the Pb availability in the plants was evidenced. The results of this study can serve as a good example for other investigations targeting the role of soil chemical elements compositional features in elements transfer to plant.
土壤地球化学数据具有成分性。因此，针对植物中有毒元素（TE）积累潜力的研究必须考虑土壤化学环境的成分性质。在本研究中，结合成分数据分析和地理空间制图来研究农业土壤中的铅地球化学关联，揭示这些关联与植物中铅含量之间的联系，并确定铅从土壤到植物的特定来源转移。所得结果表明，土壤化学成分受研究区域的地质特性和化学元素释放的潜在来源制约。特别是，k均值聚类和成分双标图能够识别出三个不同的子样本，层次聚类分析（HCA）的应用表明，在所有子样本中，土壤铅含量和植物铅含量都在同一聚类中。然而，子样本I和III中元素的地球化学关联表明，植物中的铅含量受碳酸盐地球化学行为的制约，而在子样本II中，植物铅含量呈现出一种典型的与肥料和钾长石相关的地球化学关联（钾、铷、铅和锌）。在与钾、铷、铅和锌地球化学关联相关的子样本中，观察到相对较高值的转移因子（TF）。同时，证明了碳酸盐对植物中铅有效性的负面影响。本研究结果可为其他针对土壤化学元素成分特征在元素向植物转移中的作用的研究提供一个很好的范例。
