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Modelling the effect of low soil temperatures on transpiration by Scots pine.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2006 (English)In: Hydrological Processes, ISSN 0885-6087, 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 two years of soil and snow physical measurements, as well as 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 illustrated 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
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:miun:diva-4518DOI: 10.1002/hyp.6045Local ID: 5575OAI: oai:DiVA.org:miun-4518DiVA: diva2:29550
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-08-18Bibliographically approved

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Mellander, Per-Erik
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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