S. Sheshnitsan, N. Golubkina, Tatiana Sheshnitsan, O. Murariu, A. Tallarita, Gianluca Caruso
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Water-soluble Se (0.09 ± 0.03 mg·kg−1) in soils was 32.1% of the total Se (0.33 ± 0.13 mg·kg−1) and increased with the total rising Se content (r = 0.845). The results indicated that plants had a greater Zn accumulation capacity than that of the other HMs, suggesting its importance as a trace element for plant requirements. Se also had a high bioaccumulation rate. Se and Zn accumulation varied in different soil types, reflecting differences in bioavailability. In contrast, Mn and Cu showed low bioaccumulation, which varied with soil conditions and anthropogenic Cu pollution. Despite the Cu contamination of the soils in the investigated region, it can be inferred that the hydrogeochemical province with high Se content in groundwater has favorable conditions for Se mobilization in soils. The absence of antagonistic interactions with HMs in the soil–plant system contributes to the enhanced Se accumulation in plants in the Lower Dniester Valley. 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引用次数: 0
摘要
硒(Se)和重金属(HMs)在植物中的生物累积非常重要,因为它会影响植物健康和人类营养。认识影响硒在植物中积累的因素可能会对富硒地区的农业实践和人类健康产生重要影响。这项研究主要侧重于下德涅斯特河谷土壤-植物系统中 Se 和 HMs 之间的相互作用。通过原子吸收光谱法测定了 HMs(铜、锰、锌)的总浓度,而通过灵敏的单试管荧光测定法测定了溶液和提取物中的硒浓度。土壤中的水溶性硒(0.09 ± 0.03 mg-kg-1)占总硒(0.33 ± 0.13 mg-kg-1)的 32.1%,并随总硒含量的上升而增加(r = 0.845)。结果表明,植物对锌的积累能力大于其他 HMs,这表明锌作为微量元素对植物需求的重要性。硒的生物累积率也很高。在不同的土壤类型中,硒和锌的积累量各不相同,这反映了生物利用率的差异。相比之下,锰和铜的生物累积率较低,且随土壤条件和人为铜污染而变化。尽管调查地区的土壤受到了铜污染,但可以推断,地下水中硒含量较高的水文地质化学省为土壤中硒的迁移提供了有利条件。土壤-植物系统中不存在与 HMs 的拮抗作用,这也是下德涅斯特河谷植物体内硒积累增加的原因。这些结果强调了土壤-植物系统中 Se 与 HMs 之间相互作用的复杂性及其对农业实践的潜在影响。
Selenium and Heavy Metals in Soil–Plant System in a Hydrogeochemical Province with High Selenium Content in Groundwater: A Case Study of the Lower Dniester Valley
The bioaccumulation of selenium (Se) and heavy metals (HMs) in plants is important because it can affect plant health and human nutrition. Recognizing the factors affecting Se accumulation in plants may have important implications for agricultural practices and human health in selenium-rich regions. The study primarily focused on the interactions between Se and HMs in the soil–plant system of the Lower Dniester Valley. Total concentrations of HMs (Cu, Mn, Zn) were determined by atomic absorption spectrometry, while Se concentrations were determined by a sensitive single-test-tube fluorometric method in solutions and extracts. Water-soluble Se (0.09 ± 0.03 mg·kg−1) in soils was 32.1% of the total Se (0.33 ± 0.13 mg·kg−1) and increased with the total rising Se content (r = 0.845). The results indicated that plants had a greater Zn accumulation capacity than that of the other HMs, suggesting its importance as a trace element for plant requirements. Se also had a high bioaccumulation rate. Se and Zn accumulation varied in different soil types, reflecting differences in bioavailability. In contrast, Mn and Cu showed low bioaccumulation, which varied with soil conditions and anthropogenic Cu pollution. Despite the Cu contamination of the soils in the investigated region, it can be inferred that the hydrogeochemical province with high Se content in groundwater has favorable conditions for Se mobilization in soils. The absence of antagonistic interactions with HMs in the soil–plant system contributes to the enhanced Se accumulation in plants in the Lower Dniester Valley. These results emphasize the complexity of the interactions between Se and HMs in the soil–plant system and their potential impact on agricultural practices.