Seasonal variation of δ18O and δ2H in leaf water of Fagus sylvatica L. and related water compartments

The study aims to assess variability in leaf water isotopic enrichment occurring in the field under natural conditions. We focused on seasonal variation and difference between sun-exposed and shaded leaves. Isotopic composition (δ18O, δ2H) of leaf water was monitored in a beech tree (Fagus sylvatica...

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Bibliographic Details
Published in:Journal of plant physiology 2018-08, Vol.227, p.56-65
Main Authors: Plavcová, Lenka, Hronková, Marie, Šimková, Marie, Květoň, Jiří, Vráblová, Martina, Kubásek, Jiří, Šantrůček, Jiří
Format: Article
Language:English
Subjects:
Beech
Compartments
Enrichment
Fagus
Fagus sylvatica
Flowers & plants
Irradiance
Isotope composition
Isotopic enrichment
Leaf water
Leaves
Moisture content
Precipitation
Seasonal course
Seasonal variations
Soil
Soil water
Soils
Sun
Water isotopes
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Summary:The study aims to assess variability in leaf water isotopic enrichment occurring in the field under natural conditions. We focused on seasonal variation and difference between sun-exposed and shaded leaves. Isotopic composition (δ18O, δ2H) of leaf water was monitored in a beech tree (Fagus sylvatica L.) growing in the forest-meadow ecotone together with δ18O (2H) of water compartments which are in close relation to this signal, namely twig and soil water. The sampling was carried out in approximately two-week intervals during five consecutive vegetation seasons. The δ18O (2H) data showed a distinct seasonal pattern and a consistency in relative differences between the seasons and sample categories. Leaf water was the most isotopically enriched water compartment. The leaf water enrichment decreased toward the autumn reflecting the change in δ18O (2H) of source water and evaporative demands. The soil and twig water isotopic signal was depleted against current precipitation as it partly retained the isotopic signature from winter precipitation however the seasonal pattern of soil and twig water followed that of precipitation. No significant differences between sun-exposed and shaded samples were detected. Nevertheless, the observed strong seasonal pattern of isotope composition of leaf, twig and soil water should be taken into account when using leaf water enrichment for further calculations or modeling.
ISSN:0176-1617
1618-1328
DOI:10.1016/j.jplph.2018.03.009