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@ARTICLE{Wu:874046,
      author       = {Wu, B. and Wang, Y. and Berns, A. E. and Schweitzer, K. and
                      Bauke, S. L. and Bol, R. and Amelung, W.},
      title        = {{I}ron isotope fractionation in soil and graminaceous crops
                      after 100 years of liming in the long-term agricultural
                      experimental site at {B}erlin-{D}ahlem, {G}ermany},
      journal      = {European journal of soil science},
      volume       = {72},
      number       = {1},
      issn         = {1351-0754},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2020-01201},
      pages        = {289-299},
      year         = {2021},
      abstract     = {Sustainable arable cropping relies on repeated liming. Yet,
                      the associated increase in soil pH can reduce the
                      availability of iron (Fe) to plants. We hypothesized that
                      repeated liming, but not pedogenic processes such as
                      lessivage (i.e., translocation of clay particles), alters
                      the Fe cycle in Luvisol soil, therewith affecting Fe isotope
                      composition in soils and crops. Hence, we analyzed Fe
                      concentrations and isotope compositions in soil profiles and
                      winter rye from the long‐term agricultural experimental
                      site in Berlin‐Dahlem, Germany, where a controlled liming
                      trial with three field replicates per treatment has been
                      conducted on Albic Luvisols since 1923. Heterogeneity in
                      subsoil was observed at this site for Fe concentration but
                      not for Fe isotope composition. Lessivage had not affected
                      Fe isotope composition in the soil profiles. The results
                      also showed that almost 100 years of liming lowered the
                      concentration of the HCl‐extractable Fe that was
                      potentially available for plant uptake in the surface soil
                      (0–15 cm) from 1.03 (SE 0.03) to 0.94 (SE 0.01) g
                      kg−1. This HCl‐extractable Fe pool contained
                      isotopically lighter Fe (δ56Fe = −0.05 to −0.29‰)
                      than the bulk soil (δ56Fe = −0.08 to 0.08‰). However,
                      its Fe isotope composition was not altered by the
                      long‐term lime application. Liming resulted in relatively
                      lower Fe concentrations in the roots of winter rye. In
                      addition, liming led to a heavier Fe isotope composition of
                      the whole plants compared with those grown in the
                      non‐limed plots $(δ56FeWholePlant_ + Lime$ =
                      −0.12‰ SE 0.03 vs. $δ56FeWholePlant_‐Lime$ =
                      −0.21‰ SE 0.01). This suggests that the elevated soil pH
                      (increased by 1 unit due to liming) promoted the Fe uptake
                      strategy through complexation of Fe(III) from the
                      rhizosphere, which favoured heavier Fe isotopes. Overall,
                      the present study showed that liming and related increase in
                      pH did not affect the Fe isotope compositions of the soil,
                      but may influence the Fe isotope composition of plants grown
                      in the soil if they alter their Fe uptake strategy upon the
                      change of Fe availability.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000562445200001},
      doi          = {10.1111/ejss.12944},
      url          = {https://juser.fz-juelich.de/record/874046},
}