Inclusion of a cold hardening scheme to represent frost tolerance is essential to model realistic plant hydraulics in the Arctic-boreal zone in CLM5.0-FATES-Hydro
(2022) In Geoscientific Model Development 15(23). p.8809-8829- Abstract
As temperatures decrease in autumn, vegetation of temperate and boreal ecosystems increases its tolerance to freezing. This process, known as hardening, results in a set of physiological changes at the molecular level that initiate modifications of cell membrane composition and the synthesis of anti-freeze proteins. Together with the freezing of extracellular water, anti-freeze proteins reduce plant water potentials and xylem conductivity. To represent the responses of vegetation to climate change, land surface schemes increasingly employ "hydrodynamic"models that represent the explicit fluxes of water from soil and through plants. The functioning of such schemes under frozen soil conditions, however, is poorly understood. Nonetheless,... (More)
As temperatures decrease in autumn, vegetation of temperate and boreal ecosystems increases its tolerance to freezing. This process, known as hardening, results in a set of physiological changes at the molecular level that initiate modifications of cell membrane composition and the synthesis of anti-freeze proteins. Together with the freezing of extracellular water, anti-freeze proteins reduce plant water potentials and xylem conductivity. To represent the responses of vegetation to climate change, land surface schemes increasingly employ "hydrodynamic"models that represent the explicit fluxes of water from soil and through plants. The functioning of such schemes under frozen soil conditions, however, is poorly understood. Nonetheless, hydraulic processes are of major importance in the dynamics of these systems, which can suffer from, e.g., winter "frost drought"events. In this study, we implement a scheme that represents hardening into CLM5.0-FATES-Hydro. FATES-Hydro is a plant hydrodynamics module in FATES, a cohort model of vegetation physiology, growth, and dynamics hosted in CLM5.0. We find that, in frozen systems, it is necessary to introduce reductions in plant water loss associated with hardening to prevent winter desiccation. This work makes it possible to use CLM5.0-FATES-Hydro to model realistic impacts from frost droughts on vegetation growth and photosynthesis, leading to more reliable projections of how northern ecosystems respond to climate change.
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- author
- Lambert, Marius S.A. ; Tang, Hui ; Aas, Kjetil S. ; Stordal, Frode ; Fisher, Rosie A. ; Fang, Yilin ; Ding, Junyan and Parmentier, Frans Jan W. LU
- organization
- publishing date
- 2022-12
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geoscientific Model Development
- volume
- 15
- issue
- 23
- pages
- 21 pages
- publisher
- Copernicus GmbH
- external identifiers
-
- scopus:85145603510
- ISSN
- 1991-959X
- DOI
- 10.5194/gmd-15-8809-2022
- language
- English
- LU publication?
- yes
- id
- 98da3300-0f3b-40f8-8256-0ebe8d4244bc
- date added to LUP
- 2023-01-16 15:39:39
- date last changed
- 2023-01-16 15:39:39
@article{98da3300-0f3b-40f8-8256-0ebe8d4244bc,
abstract = {{<p>As temperatures decrease in autumn, vegetation of temperate and boreal ecosystems increases its tolerance to freezing. This process, known as hardening, results in a set of physiological changes at the molecular level that initiate modifications of cell membrane composition and the synthesis of anti-freeze proteins. Together with the freezing of extracellular water, anti-freeze proteins reduce plant water potentials and xylem conductivity. To represent the responses of vegetation to climate change, land surface schemes increasingly employ "hydrodynamic"models that represent the explicit fluxes of water from soil and through plants. The functioning of such schemes under frozen soil conditions, however, is poorly understood. Nonetheless, hydraulic processes are of major importance in the dynamics of these systems, which can suffer from, e.g., winter "frost drought"events. In this study, we implement a scheme that represents hardening into CLM5.0-FATES-Hydro. FATES-Hydro is a plant hydrodynamics module in FATES, a cohort model of vegetation physiology, growth, and dynamics hosted in CLM5.0. We find that, in frozen systems, it is necessary to introduce reductions in plant water loss associated with hardening to prevent winter desiccation. This work makes it possible to use CLM5.0-FATES-Hydro to model realistic impacts from frost droughts on vegetation growth and photosynthesis, leading to more reliable projections of how northern ecosystems respond to climate change.</p>}},
author = {{Lambert, Marius S.A. and Tang, Hui and Aas, Kjetil S. and Stordal, Frode and Fisher, Rosie A. and Fang, Yilin and Ding, Junyan and Parmentier, Frans Jan W.}},
issn = {{1991-959X}},
language = {{eng}},
number = {{23}},
pages = {{8809--8829}},
publisher = {{Copernicus GmbH}},
series = {{Geoscientific Model Development}},
title = {{Inclusion of a cold hardening scheme to represent frost tolerance is essential to model realistic plant hydraulics in the Arctic-boreal zone in CLM5.0-FATES-Hydro}},
url = {{http://dx.doi.org/10.5194/gmd-15-8809-2022}},
doi = {{10.5194/gmd-15-8809-2022}},
volume = {{15}},
year = {{2022}},
}