盐度对热带沿海和洪泛平原土壤吸附锌的显著影响

IF 4 2区 农林科学 Q2 SOIL SCIENCE European Journal of Soil Science Pub Date : 2024-09-24 DOI:10.1111/ejss.13575
Md. Hanif, Jay Bullen, Yves Plancherel, Matthew Kirby, Guy Kirk, Dominik Weiss
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引用次数: 0

摘要

气候变化导致海平面上升,使低洼的沿海和洪泛平原土壤盐碱化加剧,需要了解这一过程对植物养分生物利用率的影响,以调整缓解战略。锌(Zn)作为植物(包括水稻和其他主食)的微量营养元素,是一种特别重要的元素。在当前的研究中,我们的目的是调查盐碱化对代表高风险沿海和洪泛平原环境的土壤吸附锌的影响,尤其是解决我们对溶液化学和土壤成分所起作用的认识不足的问题。为此,我们在实验室进行了批量吸附实验,并在离子强度高达 0.7 mol L-1 的盐溶液中运行了地球化学模型,其中包括:(i) 包含三相(即氢氧化铁、有机物和植硅酸盐粘土)表面反应的多表面模型 (MSM);(ii) 水相与溶解的有机和无机配体的络合。使用扩散双层模型、NICA-Donnan 模型和使用 Gaines-Thomas 惯例的离子交换模型对表面反应进行了模拟。我们将实验确定的表面相质量组成与文献中的通用建模参数相结合。我们首先表明,在溶解有机物和碳酸氢盐存在的情况下,盐度的增加会促进水生锌-氯化物复合物的形成,从而降低自由 Zn2+ 的可用性,抑制锌向吸附相的分区。我们使用一种钙质水合物和一种钙矾石进行了批量吸附实验,结果表明,在 pH 值介于 3 和 6 之间的范围内,盐度会强烈降低锌的吸附。实验结果与模型计算结果的一致性令人满意,不同盐度下的均方根误差在 2.88% 至 2.92% 之间(水钙土)和 4.59% 至 2.74% 之间(托帕克特土壤)。在低盐度条件下,水曲柳土壤的吸附模型预测值略低,而在高盐度条件下,托帕阙特土壤的吸附模型预测值略高,这可能表明地球化学模型不完整,也可能表明需要对更高离子强度条件下的表面吸附模型进行参数化。目前的表面模型主要是在较低离子强度下进行参数化的。最后,我们应用 MSM 研究了代表孟加拉国土壤系列的五种内渗性土壤对锌的吸附。我们发现,盐度的增加会降低锌对土壤有机质和粘土组分的吸附。根据我们的研究结果,我们得出结论:海平面上升和气候变化导致的土壤盐度增加将对锌循环产生重大影响,并可能对三角洲和河口等沿海土壤和洪泛平原土壤重叠地区的其他微量营养元素产生影响。特别是,我们预测酸性至中性土壤对锌的吸附会减少。在盐碱化之后,包括水稻在内的农作物根系对锌的生物吸收能力将受到严重影响,从而很可能影响农作物的产量。我们的研究表明,地球化学建模与实验数据相结合,可以提高我们评估海水水位上升对世界脆弱地区盐碱化影响的能力。
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Significant effect of salinity on zinc adsorption on tropical coastal and floodplain soils

Rising sea levels due to climate change are causing increased salinisation of low-lying coastal and floodplain soils, and the impact of this process on the bioavailability of plant nutrients needs to be understood as mitigation strategies are adapted. Zinc (Zn) is an element of particular importance due to its function as a micronutrient for plants including rice and other staple foods. In the current study, our aim was to investigate the effects of salinisation on zinc adsorption onto soils representing at-risk coastal and floodplain environments, addressing in particular our knowledge gap concerning the roles that solution chemistry and soil composition play. To this end, we conducted batch adsorption experiments in the laboratory and ran geochemical models in saline solutions up to 0.7 mol L−1 ion strength incorporating both (i) a multi surface model (MSM) for surface reactions containing three phases, that is iron hydroxides, organic matter and phyllosilicate clays, and (ii) aqueous-phase complexation to dissolved organic and inorganic ligands. Surface reactions were modelled using the diffuse double layer model, the NICA–Donnan model and an ion exchange model using the Gaines–Thomas convention. We combined the experimentally determined mass composition of surface phases with generic modelling parameters taken from the literature. We first show that increasing salinity enhances the formation of aqueous Zn-chloride complexes in the presence of dissolved organic matter and bicarbonate, thereby decreasing the availability of free Zn2+ and supressing the partitioning of zinc to the adsorbed phase. We demonstrate using batch adsorption experiments with a calcareous hydraquent and a tropaquept, that salinity decreases zinc adsorption strongly in the pH range between 3 and 6. Satisfactory agreement between experiments and model calculations was achieved with root-mean-square errors ranging for different salinities between 2.88% and 2.92% for the hydraquent and between 4.59% and 2.74% for the tropaquept soil. Model predictions of adsorption were slightly inferior at low salinity for the hydraquent soil and at high salinity for the tropaquept soil, pointing possibly to an incomplete geochemical model or to a need to parametrise surface adsorption models at higher ionic strengths. Present surface models have been largely parametrised at lower ionic strength. We lastly apply the MSM to examine zinc adsorption in five endoaquepts soils, representing soil series from Bangladesh. We show that increasing salinity decreases zinc adsorption to the soil organic matter and the clay fractions. We conclude from our findings that increased soil salinity due to rising sea levels and climate change will have a significant impact on zinc cycling and possibly other micronutrients in areas where coastal soils and floodplain soils overlap, such as deltas and estuaries. In particular, we predict a decrease in zinc adsorption in acidic to neutral soils. The availability of zinc for biouptake through the roots of crop plants including rice will be significantly disturbed following salinisation, most likely affecting crop production. Our study demonstrates the potential that geochemical modelling combined with experimental data has to improve our capability to assess the effects of salinity due to rising seawater levels in vulnerable regions of the world.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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