<br>钒在土-孔隙-水-玉米系统中的迁移和转化机制,Science of the Total Environment

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钒在土-孔隙-水-玉米系统中的迁移和转化机制
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-12-23 , DOI: 10.1016/j.scitotenv.2023.169563
Ying Yang ₁ , Yi Huang ₂ , Yunhe Liu ₁ , Ganghui Jiao ₁ , Hao Dai ₁ , Xiaowen Liu ₃ , Scott S Hughes ₄

Affiliation

钒（V）在土壤-孔隙-水-玉米系统中的迁移机制尚未揭示。本研究在人工对照条件下进行盆栽试验，以揭示不同生长阶段和 V 含量梯度胁迫下 V 的分布和转运机制。土壤孔隙水中的 V 含量逐渐增加一个数量级。无株组孔隙水的 V 含量高于植物组，表明玉米根系吸收了 V。V 以五价氧阴离子的形式存在，其中 H2VO4− 占最显着的比例。随着 V 含量的增加，根面积、根数、根长和尖端数显著减少。玉米叶片丙二醛含量呈增加趋势，表明脂质过氧化程度逐渐增强。V含量依次为根>、叶、>茎、>果实和成熟期、>开花期、>拔节期。转移系数在自然条件下达到最大值，并随生长逐渐增加。同步辐射 X 射线吸收近边缘结构（XANES）分析结果表明，玉米根系中的 Fe 主要由 Fe2O3 和 Fe3O4 组成。土壤中的 Fe 主要存在于鳞辉石和 Fe2O3 中。μ-XRF 分析表明，V 和 Fe 在根中富集呈正相关，表明根对 V 和 Fe 的协同吸收。Fe2+ 的一部分以 VO2+、V（OH）2+ 或 V（OH）3 （s）的形式将 V5+ 还原为 V4+ 或 V3+，并在根部固定 V。土壤弱酸溶性组分 V 和土壤总 V 是玉米提取的重要因素。本研究为V生物地球化学行为提供了新的见解，并为正确评估其生态和人类健康风险提供了科学依据。

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The migration and transformation mechanism of vanadium in a soil-pore water-maize system

The migration mechanism of vanadium (V) in the soil-pore water-maize system has not been revealed. This study conducted pot experiments under artificial control conditions to reveal V's distribution and transport mechanism under different growth stages and V content gradient stress. The V content in the soil pore water gradually increased by an order of magnitude. The V content of pore water in the no-plant group was higher than that in the plant group, indicating that the maize roots absorbed V. The V exists in the form of pentavalent oxygen anions, in which H2VO4− occupies the most significant proportion. With increasing V content, the root area, root number, root length, and tip number decreased significantly. The malondialdehyde content in maize leaves showed an increasing trend, indicating the degree of lipid peroxidation was gradually enhanced. The V content was in the order of root > leaf > stem > fruit and maturity stage > flowering stage > jointing stage, respectively. The transfer coefficient reached a maximum under natural conditions, and increased gradually with the growth. The results of synchrotron radiation X-ray absorption near edge structure (XANES) analysis showed that Fe in maize roots mainly comprised of Fe2O3 and Fe3O4. The Fe in the soil is primarily existed in lepidocrocite and Fe2O3. The μ-XRF analysis showed that V and Fe enriched in the roots with a positive relationship, indicating the synergistic absorption of V and Fe by roots. Part of the Fe2+ reduced V5+ to V4+ or V3+ in the forms of VO2+, V(OH)2+, or V(OH)3 (s), and fixed V at the root. Soil weak acid-soluble fraction V and soil total V were vital factors to maize extraction. This study provides new insights into V biogeochemical behavior and a scientific basis for correctly evaluating its ecological and human health risks.

更新日期：2023-12-23

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