Iron Isotope Fractionation during Fe Uptake and Translocation in Alpine Plants

MIRJAM KICZKA; JAN G. WIEDERHOLD; STEPHAN M. KRAEMER; BERNARD BOURDON; RUBEN KRETZSCHMAR

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Iron Isotope Fractionation during Fe Uptake and Translocation in Alpine Plants

机译：高山植物铁吸收和转运过程中的铁同位素分馏

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The potential of stable Fe isotopes as a tracer for the biogeochemical Fe cycle depends on the understanding and quantification of the fractionation processes involved. Iron uptake and cycling by plants may influence Fe speciation in soils. Here, we determined the Fe isotopic composition of different plant parts including the complete root system of three alpine plant species [Oxyria digyna, Rumex scutatus, Agrostis gigantea) in a granitic glacier forefield, which allowed us, for the first time, to distinguish between uptake and in-plant fractionation processes. The overall range of fractionation was 4.5‰ in δ~(56)fe. Mass balance calculations demonstrated that fractionation toward lighter Fe isotopic composition occurred in two steps during uptake: (1) before active uptake, probably during mineral dissolution and (2) during selective uptake of Fe at the plasma membrane with an enrichment factor of -1.0 to -1.7‰ for all three species. lron isotopes were further fractionated during remobilization from old into new plant tissue, which changed the isotopic composition of leaves and flowers over the season. This study demonstrates the potential of Fe isotopes as a new tool in plant nutrition studies but also reveals challenges for the future application of Fe isotope signatures in soil-plant environments.

机译：稳定的Fe同位素作为生物地球化学Fe循环示踪剂的潜力取决于对相关分馏过程的理解和定量。植物对铁的吸收和循环可能会影响土壤中铁的形态。在这里，我们确定了花岗岩冰川前场中三个高山植物物种（Oxyria digyna，Rumex scutatus，Agrostis gigantea）的完整根系的不同植物部分的铁同位素组成，这使我们首次能够区分吸收和工厂内分馏过程。 δ〜（56）fe的总分馏范围为4.5‰。质量平衡计算表明，在吸收过程中分两步向较轻的Fe同位素组成分馏：（1）在主动吸收之前，可能在矿物质溶解期间；（2）在质膜上选择性吸收铁，富集系数为-1.0至所有三个物种为-1.7‰。铁同位素在从旧植物组织迁移到新植物组织的过程中被进一步分级分离，从而在整个季节改变了叶子和花朵的同位素组成。这项研究证明了铁同位素作为植物营养研究中一种新工具的潜力，但也揭示了铁同位素特征在土壤植物环境中的未来应用面临的挑战。

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《Environmental Science & Technology》 |2010年第16期|p.6144-6150|共7页
作者
MIRJAM KICZKA; JAN G. WIEDERHOLD; STEPHAN M. KRAEMER; BERNARD BOURDON; RUBEN KRETZSCHMAR;
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Institute of Biogeochemistry and Pollutant Dynamics,ETH Zurich, CHN, 8092 Zurich, Switzerland rnInstitute of Geochemistry and Petrology, ETH Zurich, NW, 8092 Zurich, Switzerland;

rnInstitute of Biogeochemistry and Pollutant Dynamics,ETH Zurich, CHN, 8092 Zurich, Switzerland rnInstitute of Geochemistry and Petrology, ETH Zurich, NW, 8092 Zurich, Switzerland;

rnDepartment of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

rnInstitute of Geochemistry and Petrology, ETH Zurich, NW, 8092 Zurich, Switzerland;

rnInstitute of Biogeochemistry and Pollutant Dynamics,ETH Zurich, CHN, 8092 Zurich, Switzerland;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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Iron Isotope Fractionation during Fe Uptake and Translocation in Alpine Plants

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