Journal
CHEMICAL GEOLOGY
Volume 444, Issue -, Pages 49-58Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemgeo.2016.09.036
Keywords
Cu isotopes; Fractionation; Elsholtzia splendens; Plant; Translocation; Remobilization
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Funding
- National Natural Science Foundation of China [41203005, 41430104]
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This study investigates the magnitude and direction of Cu isotopic fractionation in the Cu-tolerant, strategy I plant, Elsholtzia splendens, considering the effect of soil condition and plant growth cycle. Uptake of Cu by E. splendens from soil was found to favor light Cu isotopic enrichment (delta Cu-65 < 0 parts per thousand) due to reduction at the soil root interface. The magnitude of fractionation between soil and plant was found to be dependent on free Cu ion species in soil solution correlated with pH value of soil other than the phytoavailable component of soil or total soil for the same parent soil. Cu isotopic fractionation occurs in plant, the fractionation direction and magnitude would vary between different plant organs (i.e., root and stem) as well as different plant tissues (i.e., xylem and phloem). Remobilization of Cu associated with plant senescence was found to have a considerable effect on Cu isotopic fractionation within the plant, and the fractionation factor was found to change with the degree of remobilization. Overall, the results show that the Cu isotopic composition is useful as a tracer for probing the mechanisms of Cu translocation and retranslocation between soil and plants, and within plants. (C) 2016 Elsevier B.V. All rights reserved.
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