Seasonal variation of δ 18 O and δ 2 H in leaf water of Fagus sylvatica L. and related water compartments.
- Resource Type
- Academic Journal
- Authors
- Plavcová L; University of Hradec Králové, Faculty of Science, Rokitanského 62, CZ-50003, Hradec Králové, Czech Republic.; Hronková M; University of South Bohemia, Faculty of Science, Branišovská 31, CZ-37005, České Budějovice, Czech Republic; Institute of Plant Molecular Biology, Academy of Sciences of the Czech Republic, Branišovská 31, CZ-37005, České Budějovice, Czech Republic.; Šimková M; Institute of Plant Molecular Biology, Academy of Sciences of the Czech Republic, Branišovská 31, CZ-37005, České Budějovice, Czech Republic.; Květoň J; University of South Bohemia, Faculty of Science, Branišovská 31, CZ-37005, České Budějovice, Czech Republic.; Vráblová M; University of South Bohemia, Faculty of Science, Branišovská 31, CZ-37005, České Budějovice, Czech Republic; VSB - Technical University of Ostrava, Institute of Environmental Technology, 17. listopadu 15, CZ-70833, Ostrava, Czech Republic.; Kubásek J; University of South Bohemia, Faculty of Science, Branišovská 31, CZ-37005, České Budějovice, Czech Republic.; Šantrůček J; University of South Bohemia, Faculty of Science, Branišovská 31, CZ-37005, České Budějovice, Czech Republic. Electronic address: jsan@umbr.cas.cz.
- Source
- Publisher: Urban & Fischer Country of Publication: Germany NLM ID: 9882059 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1618-1328 (Electronic) Linking ISSN: 01761617 NLM ISO Abbreviation: J Plant Physiol Subsets: MEDLINE
- Subject
- Language
- English
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 (δ 18 O, δ 2 H) of leaf water was monitored in a beech tree (Fagus sylvatica L.) growing in the forest-meadow ecotone together with δ 18 O ( 2 H) 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 δ 18 O ( 2 H) 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 δ 18 O ( 2 H) 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.
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