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Effect of a coupled soil water–plant gas exchange on forest energy fluxes: Simulations with the coupled vegetation–boundary layer model HIRVAC

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  • Fischer, Björn
  • Goldberg, Valeri
  • Bernhofer, Christian

Abstract

Long-living plant communities such as forests reduce their transpiration by closing and opening the leaf stomata as a common strategy to save water in dry periods. Meteorological models including vegetation should consider this mechanism to simulate realistic water transport from the plant to the atmosphere. Results of the German network project VERTIKO showed that commonly used meso-models such as Lokalmodell (German Weather Service) often overestimate evapotranspiration of vegetated surfaces during dry periods. This is, among other things, due to the insufficient plant-specific coupling between the soil water content and the physiological reactions of leaf stomata in the implemented SVAT modules. This study presents an approach to describe the above-mentioned coupling mechanism by upgrading the coupled vegetation boundary layer model HIRVAC. A stomatal reaction on soil moisture change, which is a part of HIRVAC, is parameterised in the included mechanistic photosynthesis model for C3 plants (PSN6).

Suggested Citation

  • Fischer, Björn & Goldberg, Valeri & Bernhofer, Christian, 2008. "Effect of a coupled soil water–plant gas exchange on forest energy fluxes: Simulations with the coupled vegetation–boundary layer model HIRVAC," Ecological Modelling, Elsevier, vol. 214(2), pages 75-82.
    • Handle: RePEc:eee:ecomod:v:214:y:2008:i:2:p:75-82
    DOI: 10.1016/j.ecolmodel.2008.02.037
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    References listed on IDEAS

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    1. Christoph Schär & Pier Luigi Vidale & Daniel Lüthi & Christoph Frei & Christian Häberli & Mark A. Liniger & Christof Appenzeller, 2004. "The role of increasing temperature variability in European summer heatwaves," Nature, Nature, vol. 427(6972), pages 332-336, January.
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    Cited by:

    1. Liu, Xiaoyin & Xu, Junzeng & Liu, Boyi & Wang, Weiguang & Li, Yawei, 2019. "A novel model of water-heat coupling for water-saving irrigated rice fields based on water and energy balance: Model formulation and verification," Agricultural Water Management, Elsevier, vol. 223(C), pages 1-1.
    2. Zhu, Lin & Chen, Jing M. & Qin, Qiming & Li, Jianping & Wang, Lianxi, 2009. "Optimization of ecosystem model parameters using spatio-temporal soil moisture information," Ecological Modelling, Elsevier, vol. 220(18), pages 2121-2136.

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