1. Atmospheric drivers of storage water use in Scots pine
- Author
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Hans Verbeeck, Kathy Steppe, Nadezhdina, Nadja, Op Beeck, Maarten, Deckmyn, Gaby, Meiresonne, Linda, Lemeur, Raoul, Cermak, Jan, Ceulemans, R., Janssens, I., Research Group of Plant and Vegetation Ecology, Department of Biology, Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Institute of Forest Ecology, Mendel University in Brno (MENDELU), Research Institute for Nature and Forest, Ministry of the Flemish Community, and EGU, Publication
- Subjects
Agriculture and Food Sciences ,[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere ,0106 biological sciences ,[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] ,010504 meteorology & atmospheric sciences ,[SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere ,[SDU.STU]Sciences of the Universe [physics]/Earth Sciences ,15. Life on land ,[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph] ,01 natural sciences ,[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment ,[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] ,[SDU.STU] Sciences of the Universe [physics]/Earth Sciences ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,010606 plant biology & botany ,0105 earth and related environmental sciences - Abstract
In this study we determined the microclimatic drivers of storage water use in Scots pine (Pinus sylvestris L.) growing in a temperate climate. The storage water use was modeled using the ANAFORE model, integrating a dynamic water flow and – storage model with a process-based transpiration model. The model was calibrated and validated with sap flow measurements for the growing season of 2000 (26 May–18 October). Because there was no severe soil drought during the study period, we were able to study atmospheric effects. Incoming radiation was the main driver of storage water use. The general trends of sap flow and storage water use are similar, and follow more or less the pattern of incoming radiation. Nevertheless, considerable differences in the day-to-day pattern of sap flow and storage water use were observed, mainly driven by vapour pressure deficit (VPD). During dry atmospheric conditions (high VPD) storage water use was reduced. This reduction was disproportionally higher than the reduction in measured sap flow. Our results suggest that the trees did not rely more on storage water during periods of atmospheric drought, without severe soil drought. A third important factor was the tree water deficit. When storage compartments were depleted beyond a threshold, storage water use was limited due to the low water potential in the storage compartments. The maximum relative contribution of storage water to daily transpiration was also constrained by an increasing tree water deficit.
- Published
- 2007