Modeling daily gas exchange of a Douglas-fir forest: comparison of three stomatal conductance models with and without a soil water stress function

Citation
Mt. Van Wijk et al., Modeling daily gas exchange of a Douglas-fir forest: comparison of three stomatal conductance models with and without a soil water stress function, TREE PHYSL, 20(2), 2000, pp. 115-122
Citations number
49
Categorie Soggetti
Plant Sciences
Journal title
TREE PHYSIOLOGY
ISSN journal
0829318X → ACNP
Volume
20
Issue
2
Year of publication
2000
Pages
115 - 122
Database
ISI
SICI code
0829-318X(200001)20:2<115:MDGEOA>2.0.ZU;2-9
Abstract
Modeling stomatal conductance is a key element in predicting tree growth an d water use at the stand scale. We compared three commonly used models of s tomatal conductance, the Jarvis-Loustau, Ball-Berry and Leuning models, for their suitability for incorporating soil water stress into their formulati on, and for their performance in modeling forest ecosystem fluxes. We optim ized the parameters of each of the three models with sap flow and soil wate r content data. The optimized Ball-Berry model showed clear relationships w ith air temperature and soil water content, whereas the optimized Leuning a nd Jarvis-Loustau models only showed a relationship with soil water content . We conclude that use of relative humidity instead of vapor pressure defic it, as in the Ball-Berry model, is not suitable for modeling daily gas exch ange in Douglas-fir (Pseudotsuga menziesii (Mirb.) France) in the Speulderb os forest near the village of Garderen, The Netherlands. Based on the calcu lated responses to soil water content, we linked a model of forest growth, FORGRO, with a model of soil water, SWIF, to obtain a forest water-balance model that satisfactorily simulated carbon and water (transpiration) fluxes and soil water contents in the Douglas-fir forest for 1995.