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Modelling the effect of low soil temperatures on transpiration by Scots pine
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.
2006 (English)In: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 20, no 9, 1929-1944 p.Article in journal (Refereed) Published
Abstract [en]

For ecosystem modelling of the Boreal forest it is important to include processes associated with low soil temperature during spring-early summer, as these affect the tree water uptake. The COUP model, a physically based SVAT model, was tested with 2 years of soil and snow physical measurements and sap flow measurements in a 70-year-old Scots pine stand in the boreal zone of northern Sweden. During the first year the extent and duration of soil frost was manipulated in the field. The model was successful in reproducing the timing of the soil warming after the snowmelt and frost thaw. A delayed soil warming, into the growing season, severely reduced the transpiration. We demonstrated the potential for considerable overestimation of transpiration by the model if the reduction of the trees' capacity to transpire due to low soil temperatures is not taken into account. We also demonstrated that the accumulated effect of aboveground conditions could be included when simulating the relationship between soil temperature and tree water uptake. This improved the estimated transpiration for the control plot and when soil warming was delayed into the growing season. The study illustrates the need of including antecedent conditions on root growth in the model in order to catch these effects on transpiration. The COUP model is a promising tool for predicting transpiration in high-latitude stands.

Place, publisher, year, edition, pages
2006. Vol. 20, no 9, 1929-1944 p.
Keyword [en]
snow, soil frost, soil temperature, sap flow, root water uptake, COUP model, northern hardwood forest/, water-absorption, root resistance, snowmelt runoff, white spruce, sap flow, seedlings, dynamics, stress, frost
URN: urn:nbn:se:kth:diva-15753DOI: 10.1002/hyp.6045ISI: 000238321000005ScopusID: 2-s2.0-33745066660OAI: diva2:333795
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Gustafsson, David
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