Drought reduces water uptake in beech from the drying topsoil, but no compensatory uptake occurs from deeper soil layers.
Bayesian isotope mixing model
European beech (Fagus sylvatica)
drought
drought release
oxygen isotopes
soil water
tree water use
xylem water
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
01 2022
01 2022
Historique:
received:
03
08
2021
accepted:
26
09
2021
pubmed:
6
10
2021
medline:
7
1
2022
entrez:
5
10
2021
Statut:
ppublish
Résumé
The intensity and frequency of droughts events are projected to increase in future with expected adverse effects for forests. Thus, information on the dynamics of tree water uptake from different soil layers during and after drought is crucial. We applied an in situ water isotopologue monitoring system to determine the oxygen isotope composition in soil and xylem water of European beech with a 2-h resolution together with measurements of soil water content, transpiration and tree water deficit. Using a Bayesian isotope mixing model, we inferred the relative and absolute contribution of water from four different soil layers to tree water use. Beech took up more than 50% of its water from the uppermost 5 cm soil layer at the beginning of the 2018 drought, but then reduced absolute water uptake from the drying topsoil by 84%. The trees were not able to quantitatively compensate for restricted topsoil water availability by additional uptake from deeper soil layers, which is related to the fine root depth distribution. Absolute water uptake from the topsoil was restored to pre-drought levels within 3 wk after rewetting. These uptake patterns help to explain both the drought sensitivity of beech and its high recovery potential after drought release.
Identifiants
pubmed: 34610146
doi: 10.1111/nph.17767
pmc: PMC9293437
doi:
Substances chimiques
Soil
0
Water
059QF0KO0R
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
194-206Informations de copyright
© 2021 The Authors. New Phytologist © 2021 New Phytologist Foundation.
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