The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status
Where there is sufficient water storage in the soil the water potential (<i>Ψ<sub>x</sub></i>) in shoots of Norway spruce [<i>Picea abies</i> (L.) Karst.] is strongly governed by the vapour pressure deficit of the atmosphere, while the mean minimum v...
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Copernicus Publications
1998-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/16/470/1998/angeo-16-470-1998.pdf |
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doaj-d91e5d11d9b642cf85af700682b071f82020-11-24T22:27:32ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761998-04-011647047610.1007/s00585-998-0470-6The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water statusA. Sellin0Department of Botany and Ecology, University of Tartu, Lai 40, EE 2400 Tartu, Estonia, E-mail: arne@zbi.eeWhere there is sufficient water storage in the soil the water potential (<i>Ψ<sub>x</sub></i>) in shoots of Norway spruce [<i>Picea abies</i> (L.) Karst.] is strongly governed by the vapour pressure deficit of the atmosphere, while the mean minimum values of <i>Ψ<sub>x</sub></i> usually do not drop below –1.5 MPa under meteorological conditions in Estonia. If the base water potential (<i>Ψ<sub>b</sub></i>) is above –0.62 MPa, the principal factor causing water deficiency in shoots of <i>P. abies</i> may be either limited soil water reserves or atmospheric evaporative demand depending on the current level of the vapour pressure deficit. As the soil dries the stomatal control becomes more efficient in preventing water losses from the foliage, and the leaf water status, in turn, less sensitive to atmospheric demand. Under drought conditions, if <i>Ψ<sub>b</sub></i> falls below –0.62 MPa, the trees' water stress is mainly caused by low soil water availability. Further declines in the shoot water potential (below –1.5 MPa) can be attributed primarily to further decreases in the soil water, i.e. to the static water stress.<br><br><b>Key words. </b>Hydrology (evapotranspiration · plant ecology · soil moisture).https://www.ann-geophys.net/16/470/1998/angeo-16-470-1998.pdf |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
A. Sellin |
| spellingShingle |
A. Sellin The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status Annales Geophysicae |
| author_facet |
A. Sellin |
| author_sort |
A. Sellin |
| title |
The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status |
| title_short |
The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status |
| title_full |
The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status |
| title_fullStr |
The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status |
| title_full_unstemmed |
The dependence of water potential in shoots of <i>Picea abies</i> on air and soil water status |
| title_sort |
dependence of water potential in shoots of <i>picea abies</i> on air and soil water status |
| publisher |
Copernicus Publications |
| series |
Annales Geophysicae |
| issn |
0992-7689 1432-0576 |
| publishDate |
1998-04-01 |
| description |
Where there is sufficient water storage in
the soil the water potential (<i>Ψ<sub>x</sub></i>) in shoots of
Norway spruce [<i>Picea abies</i> (L.) Karst.] is strongly governed by the
vapour pressure deficit of the atmosphere, while the mean minimum values of
<i>Ψ<sub>x</sub></i> usually do not drop below –1.5 MPa under
meteorological conditions in Estonia. If the base water potential (<i>Ψ<sub>b</sub></i>)
is above –0.62 MPa, the principal factor causing water deficiency in shoots of <i>P.
abies</i> may be either limited soil water reserves or atmospheric evaporative
demand depending on the current level of the vapour pressure deficit. As the
soil dries the stomatal control becomes more efficient in preventing water
losses from the foliage, and the leaf water status, in turn, less sensitive to
atmospheric demand. Under drought conditions, if <i>Ψ<sub>b</sub></i>
falls below –0.62 MPa, the trees' water stress is mainly caused by low soil
water availability. Further declines in the shoot water potential (below –1.5
MPa) can be attributed primarily to further decreases in the soil water, i.e. to
the static water stress.<br><br><b>Key words. </b>Hydrology (evapotranspiration · plant
ecology · soil moisture). |
| url |
https://www.ann-geophys.net/16/470/1998/angeo-16-470-1998.pdf |
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AT asellin thedependenceofwaterpotentialinshootsofipiceaabiesionairandsoilwaterstatus AT asellin dependenceofwaterpotentialinshootsofipiceaabiesionairandsoilwaterstatus |
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