Preprints
https://doi.org/10.5194/egusphere-2025-1259
https://doi.org/10.5194/egusphere-2025-1259
14 Apr 2025
 | 14 Apr 2025

Implementing a process-based representation of soil water movement in a second-generation dynamic vegetation model: application to dryland ecosystems (LPJ-GUESS-RE v1.0)

Wim Verbruggen, David Wårlind, Stéphanie Horion, Félicien Meunier, Hans Verbeeck, and Guy Schurgers

Abstract. Dryland ecosystems are globally important, yet state-of-the-art dynamic vegetation models often lack specific processes or parameterizations that are critical for accurately simulating dryland dynamics. These missing processes include a realistic calculation of soil water movement, detailed plant-water relations, or a representation of deep water uptake. In this study we show how including a process-based soil hydrology scheme in the LPJ-GUESS (Lund-Potsdam-Jena General Ecosystem Simulator) model can improve its usefulness for simulating the functioning of dryland ecosystems. By replacing the default 15-layer bucket representation of soil hydrology in LPJ-GUESS v4.1 with a mechanistic description of soil water movement based on the 1D Richards Equation, we show that the model is better able to capture seasonal patterns of water cycling through dryland ecosystems at both the site level and the regional level. In addition, the inclusion of a new set of bottom boundary conditions, such as a permanent groundwater layer, further expands the range of ecosystems the LPJ-GUESS model can simulate. We show that soil bottom boundary conditions, in particular varying levels of groundwater depth, can have a large influence on vegetation composition and water cycling. Our new model developments open new avenues to simulate dryland ecohydrology more realistically.

Competing interests: One of the co-authors (Prof. Dr. Hans Verbeeck) is a member of the editorial board of Geoscientific Model Development.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
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Journal article(s) based on this preprint

30 Sep 2025
Implementing a process-based representation of soil water movement in a second-generation dynamic vegetation model: application to dryland ecosystems (LPJ-GUESS-RE v1.0)
Wim Verbruggen, David Wårlind, Stéphanie Horion, Félicien Meunier, Hans Verbeeck, Aleksander Wieckowski, Torbern Tagesson, and Guy Schurgers
Geosci. Model Dev., 18, 6623–6645, https://doi.org/10.5194/gmd-18-6623-2025,https://doi.org/10.5194/gmd-18-6623-2025, 2025
Short summary
Wim Verbruggen, David Wårlind, Stéphanie Horion, Félicien Meunier, Hans Verbeeck, and Guy Schurgers

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1259', Anonymous Referee #1, 19 May 2025
    • AC1: 'Reply on RC1', Wim Verbruggen, 14 Jul 2025
  • CC1: 'Comment on egusphere-2025-1259', David Hötten, 10 Jun 2025
  • RC2: 'Comment on egusphere-2025-1259', David Hötten, 17 Jun 2025
    • AC2: 'Reply on RC2', Wim Verbruggen, 14 Jul 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1259', Anonymous Referee #1, 19 May 2025
    • AC1: 'Reply on RC1', Wim Verbruggen, 14 Jul 2025
  • CC1: 'Comment on egusphere-2025-1259', David Hötten, 10 Jun 2025
  • RC2: 'Comment on egusphere-2025-1259', David Hötten, 17 Jun 2025
    • AC2: 'Reply on RC2', Wim Verbruggen, 14 Jul 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Wim Verbruggen on behalf of the Authors (14 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (15 Jul 2025) by Christoph Müller
AR by Wim Verbruggen on behalf of the Authors (16 Jul 2025)  Manuscript 

Journal article(s) based on this preprint

30 Sep 2025
Implementing a process-based representation of soil water movement in a second-generation dynamic vegetation model: application to dryland ecosystems (LPJ-GUESS-RE v1.0)
Wim Verbruggen, David Wårlind, Stéphanie Horion, Félicien Meunier, Hans Verbeeck, Aleksander Wieckowski, Torbern Tagesson, and Guy Schurgers
Geosci. Model Dev., 18, 6623–6645, https://doi.org/10.5194/gmd-18-6623-2025,https://doi.org/10.5194/gmd-18-6623-2025, 2025
Short summary
Wim Verbruggen, David Wårlind, Stéphanie Horion, Félicien Meunier, Hans Verbeeck, and Guy Schurgers

Model code and software

LPJ-GUESS with soil water movement based on Richard's equation (LPJ-GUESS-RE v1.0) Wim Verbruggen et al. https://doi.org/10.5281/zenodo.15024130

Wim Verbruggen, David Wårlind, Stéphanie Horion, Félicien Meunier, Hans Verbeeck, and Guy Schurgers

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
We improved the representation of soil water movement in a state-of-the-art dynamic vegetation model. This is especially important for dry ecosystems, as they are often driven by changes in soil water availability. We showed that this update resulted in a generally better match with observations, and that the updated model is more sensitive to soil texture. This updated model will help scientists to better understand the future of dry ecosystems under climate change.
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