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Plant and Soil

, Volume 330, Issue 1–2, pp 481–501 | Cite as

Modelling rhizosphere transport in the presence of goethite, including competitive uptake of phosphate and arsenate

  • Krisztian SzegediEmail author
  • Doris Vetterlein
  • Reinhold Jahn
Regular Article

Abstract

A modelling approach was used to extend the knowledge about the processes that affect the availability of the nutrient P and the toxic agent AsV in the rhizosphere in the presence of a strong sorbent. Based on compartment system experiments in which Zea mays was grown the following hypothesis were assumed: a) measured P concentration gradients can be explained by the mobilisation of P by the root exudate citrate, and b) measured AsV concentration gradients can be explained by the simultaneous effect of the competitive sorption of AsV and P and the competitive uptake of AsV and P. First, the feasibility of the applied description of soil chemical processes was justified. Then competitive uptake was implemented in the computer code using two different mathematical approaches. Our model calculation provided support for hypothesis a) and suggested that hypothesis b) has to be extended. The results show that the competitive uptake of AsV and P has an influence on AsV concentrations in the rhizosphere, but including competitive uptake was not sufficient to predict observed AsV concentration profiles. Recent results on plant As-metabolism like AsIII efflux and Si AsIII interaction probably have to be included in addition for simulation of measured AsV concentration profiles.

Keywords

Rhizosphere Modelling Speciation Phosphate Arsenate Goethite 

Notes

Acknowledgements

The authors thank for the valuable comments of the anonymous reviewers of this manuscript.

This work was conducted in the framework of the BASS Helmholtz-University Young Investigators Group, supported by the Helmholtz Association Germany.

Supplementary material

11104_2009_221_MOESM1_ESM.doc (40 kb)
Table S1 (DOC 40 kb)
11104_2009_221_MOESM2_ESM.doc (40 kb)
Figure S1 (DOC 39 kb)

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Krisztian Szegedi
    • 1
    • 2
    Email author
  • Doris Vetterlein
    • 1
    • 2
  • Reinhold Jahn
    • 2
  1. 1.Department of Soil PhysicsHelmholtz Centre for Environmental Research-UFZHalle (Saale)Germany
  2. 2.Soil Science and Soil Protection Group, Institute of Agricultural and Nutritional SciencesMartin Luther University Halle-WittenbergHalle (Saale)Germany

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