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A Dynamic Model for Strategies and Dynamics of Plant Water-Potential Regulation Under Drought Conditions

Papastefanou, Phillip ; Zang, Christian S. ; Pugh, Thomas A.M. LU ; Liu, Daijun ; Grams, Thorsten E.E. ; Hickler, Thomas LU and Rammig, Anja LU (2020) In Frontiers in Plant Science 11.
Abstract

Vegetation responds to drought through a complex interplay of plant hydraulic mechanisms, posing challenges for model development and parameterization. We present a mathematical model that describes the dynamics of leaf water-potential over time while considering different strategies by which plant species regulate their water-potentials. The model has two parameters: the parameter λ describing the adjustment of the leaf water potential to changes in soil water potential, and the parameter Δψww describing the typical ‘well-watered’ leaf water potentials at non-stressed (near-zero) levels of soil water potential. Our model was tested and calibrated on 110 time-series datasets containing the leaf- and soil water potentials of... (More)

Vegetation responds to drought through a complex interplay of plant hydraulic mechanisms, posing challenges for model development and parameterization. We present a mathematical model that describes the dynamics of leaf water-potential over time while considering different strategies by which plant species regulate their water-potentials. The model has two parameters: the parameter λ describing the adjustment of the leaf water potential to changes in soil water potential, and the parameter Δψww describing the typical ‘well-watered’ leaf water potentials at non-stressed (near-zero) levels of soil water potential. Our model was tested and calibrated on 110 time-series datasets containing the leaf- and soil water potentials of 66 species under drought and non-drought conditions. Our model successfully reproduces the measured leaf water potentials over time based on three different regulation strategies under drought. We found that three parameter sets derived from the measurement data reproduced the dynamics of 53% of an drought dataset, and 52% of a control dataset [root mean square error (RMSE) < 0.5 MPa)]. We conclude that, instead of quantifying water-potential-regulation of different plant species by complex modeling approaches, a small set of parameters may be sufficient to describe the water potential regulation behavior for large-scale modeling. Thus, our approach paves the way for a parsimonious representation of the full spectrum of plant hydraulic responses to drought in dynamic vegetation models.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
climate change, drought, isohydricity, leaf water potential, plant-hydraulics, water stress
in
Frontiers in Plant Science
volume
11
article number
373
publisher
Frontiers Media S. A.
external identifiers
  • scopus:85084598824
  • pmid:32411150
ISSN
1664-462X
DOI
10.3389/fpls.2020.00373
language
English
LU publication?
yes
id
ec59db5f-5668-4494-b132-8117a32906fc
date added to LUP
2020-11-19 22:02:59
date last changed
2024-05-02 20:02:06
@article{ec59db5f-5668-4494-b132-8117a32906fc,
  abstract     = {{<p>Vegetation responds to drought through a complex interplay of plant hydraulic mechanisms, posing challenges for model development and parameterization. We present a mathematical model that describes the dynamics of leaf water-potential over time while considering different strategies by which plant species regulate their water-potentials. The model has two parameters: the parameter λ describing the adjustment of the leaf water potential to changes in soil water potential, and the parameter Δψ<sub>ww</sub> describing the typical ‘well-watered’ leaf water potentials at non-stressed (near-zero) levels of soil water potential. Our model was tested and calibrated on 110 time-series datasets containing the leaf- and soil water potentials of 66 species under drought and non-drought conditions. Our model successfully reproduces the measured leaf water potentials over time based on three different regulation strategies under drought. We found that three parameter sets derived from the measurement data reproduced the dynamics of 53% of an drought dataset, and 52% of a control dataset [root mean square error (RMSE) &lt; 0.5 MPa)]. We conclude that, instead of quantifying water-potential-regulation of different plant species by complex modeling approaches, a small set of parameters may be sufficient to describe the water potential regulation behavior for large-scale modeling. Thus, our approach paves the way for a parsimonious representation of the full spectrum of plant hydraulic responses to drought in dynamic vegetation models.</p>}},
  author       = {{Papastefanou, Phillip and Zang, Christian S. and Pugh, Thomas A.M. and Liu, Daijun and Grams, Thorsten E.E. and Hickler, Thomas and Rammig, Anja}},
  issn         = {{1664-462X}},
  keywords     = {{climate change; drought; isohydricity; leaf water potential; plant-hydraulics; water stress}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Frontiers Media S. A.}},
  series       = {{Frontiers in Plant Science}},
  title        = {{A Dynamic Model for Strategies and Dynamics of Plant Water-Potential Regulation Under Drought Conditions}},
  url          = {{http://dx.doi.org/10.3389/fpls.2020.00373}},
  doi          = {{10.3389/fpls.2020.00373}},
  volume       = {{11}},
  year         = {{2020}},
}