A new model for root growth in soil with macropores

Magdalena Landl (Lead / Corresponding author), Katrin Huber, Andrea Schnepf, Jan Vanderborght, Mathieu Javaux, A. Glyn Bengough, Harry Vereecken

Research output: Contribution to journalArticle

15 Citations (Scopus)
193 Downloads (Pure)

Abstract

Background and aims: The use of standard dynamic root architecture models to simulate root growth in soil containing macropores failed to reproduce experimentally
observed root growth patterns. We thus developed a new, more mechanistic model approach for the simulation of root growth in structured soil.

Methods: In our alternative modelling approach, we distinguish between, firstly, the driving force for root growth, which is determined by the orientation of the previous root segment and the influence of gravitropism and, secondly, soil mechanical resistance to root growth. The latter is expressed by its inverse, soil mechanical conductance, and treated similarly to hydraulic conductivity in Darcy’s law. At the presence of macropores, soil mechanical conductance is anisotropic, which leads to a difference between the direction of the driving force and the direction of the root tip movement.

Results: The model was tested using data from the literature, at pot scale, at macropore scale, and in a series of simulations where sensitivity to gravity and macropore orientation was evaluated.

Conclusions: Qualitative and quantitative comparisons between simulated and experimentally observed root systems showed good agreement, suggesting that the drawn analogy between soil water flow and root growth is a useful one.
Original languageEnglish
Pages (from-to)99-116
Number of pages18
JournalPlant and Soil
Volume415
Early online date17 Dec 2016
DOIs
Publication statusPublished - Jun 2017

Keywords

  • Macropores
  • Root architecture model
  • Root growth direction
  • R-SWMS

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    Landl, M., Huber, K., Schnepf, A., Vanderborght, J., Javaux, M., Bengough, A. G., & Vereecken, H. (2017). A new model for root growth in soil with macropores. Plant and Soil, 415, 99-116. https://doi.org/10.1007/s11104-016-3144-2