Abstract Nickel bearing soils derived from serpentinized ultramafic rocks are widely exposed as two parallel zones in Bavanat region along the Sedimentary Zagros Orogenic (SZO) and Metamorphic Sanandaj-Sirjan (MSS) belts. These laterites in the Mazayejan area of the Northern zone are divided into two groups; the in situ soils found mainly in the east, and the transported soils which are common in the west of the study area. The maximum Ni concentration of the studied soils is 1787 μg g−1. The main vegetation types of the area include open shrub lands and semi-desert steppes. Many soil characteristics in the study area are quite variable, such as Mg/Ca ratio, exchangeable metal fraction, extraction efficiency (EF), pH, organic content (OM), texture, and cation exchange capacity (CEC) as well as seasonal variation of Ni availability and metal transfer to plants. This study indicated that low Mg/Ca ratio (0.1–2.3 μg g−1), high carbonate content (up to 42.8 wt%) and very low exchangeable Ni fraction (0.01–0.34 μg g−1) result in low uptake of nickel by plants. Low EF, but high pH and OM result in Ni fixation in the soils, and consequently low Ni transfer factor to plants. Clay textured soils with high CEC (10.5 wt%) are characterized by the lowest transfer coefficient of Ni from soil to plant, due to the stronger adsorption of Ni in the soils. Ni concentration in living tissues change with the season, the leaves of the same plants investigated in autumn contain more Ni than in spring. As a result, plant sampling in autumn should be preferred for nickel exploration when using biogeochemical and other methods such as Ni phytoextraction, by selected plants.

中文翻译：

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生长在镍红土上的植物吸收镍的控制因素：伊朗西南部马扎耶詹地区生物地球化学勘探的案例研究

摘要 源自蛇纹石化超基性岩的含镍土壤在巴瓦纳特地区沿着沉积扎格罗斯造山带 (SZO) 和变质的 Sanandaj-Sirjan (MSS) 带广泛暴露为两个平行带。北部地区马扎耶詹地区的这些红土分为两组；原位土主要分布在东部，迁移土常见于研究区西部。所研究土壤的最大镍浓度为 1787 μg g-1。该地区的主要植被类型包括开阔灌木地和半荒漠草原。研究区的许多土壤特征变化很大，例如镁/钙比例、可交换金属分数、提取效率 (EF)、pH、有机物含量 (OM)、质地、和阳离子交换容量 (CEC) 以及 Ni 可用性和金属向植物转移的季节性变化。该研究表明，低 Mg/Ca 比（0.1-2.3 μg g-1）、高碳酸盐含量（高达 42.8 wt%）和极低的可交换镍分数（0.01-0.34 μg g-1）导致镍的低吸收由植物。低 EF，但高 pH 值和 OM 导致土壤中的 Ni 固定，从而导致 Ni 向植物的转移因子低。具有高 CEC (10.5 wt%) 的粘土质地土壤的特点是镍从土壤到植物的转移系数最低，因为土壤中的镍吸附更强。活组织中Ni浓度随季节变化，秋季调查的同种植物叶片中Ni含量高于春季。因此，