© 2007 Heron Publishing—Victoria, Canada
Stored water use and transpiration in Scots pine: a modeling analysis with ANAFORE
Hans Verbeeck (1, 2), Kathy Steppe (3), Nadja Nadezhdina (4), Maarten Op de Beek (1), Gaby Deckmyn (1), Linda Meiresonne (5), Raoul Lemeur (3), Jan Čermák (4), Reinhart Ceulemans (1) and Ivan A. Janssens (1)
1. Research Group of Plant and Vegetation Ecology, Department of Biology, University of Antwerp, Universiteitsplein 1, B-2610
Antwerp, Belgium / 2. Corresponding author (hans.verbeeck@ua.ac.be) / 3. Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Ghent University, Coupure Links 653,
B-9000 Ghent, Belgium / 4. Institute of Forest Ecology, Mendel University of Agriculture and Forestry, Zemědělská 3, 61300 Brno, Czech Republic / 5. Research Institute for Nature and Forest, Ministry of the Flemish Community, Gaverstraat 4, 9500 Geraardsbergen, Belgium / Received October 27, 2006; accepted February 26, 2007; published online September 4, 2007
Summary
We estimated daily use of stored water by Scots pine (Pinus sylvestris L.) trees growing in a temperate climate with the ANAFORE model (ANAlysis of FORest Ecosystems) and compared the simulation
results with sap flow measurements. The original model was expanded with a dynamic water flow and storage model that simulates
sap flow dynamics in an individual tree. ANAFORE was able to accurately simulate diurnal patterns of measured sap flow under
microclimatic conditions that differ from those of the calibration period. Strong relationships were found between stored
water use and several tree characteristics (diameter at breast height, sapwood area, leaf area), but not with tree height.
Relative to transpiration, stored water use varied over time (between < 1% and 44% of daily transpiration). On days when transpiration
was high, trees were more dependent on stored water, indicating that the contribution of internal water to transpiration is
not a constant in the water budget of trees.
Keywords:
nighttime transpiration, Pinus sylvestris, sap flow, stomatal conductance.
