Properties of secondary xylem of mature oaks in southwest Germany formed after extreme drought stress in summer 2018

  • The effect of the extreme summer drought and heatwave 2018 in Central Europe on wood properties of oaks at four sandy valley river sites (Quercus robur L.) and one south-exposed schist slope (Qu. petraea (Matt.) Liebl.) in the middle Rhine and lower Main valley were studied and compared to well-watered trees from a riparian stand. While properties of the 2018 tree rings mostly resembled those of the previous (wet) year, significant decreases in Δ13C, wood density and ring width occurred in 2019 at most drought-prone sites. In the sandy sites, ring widths correlated with previous-year precipitation from June to August over a 20-year period. In organs formed in 2018, in general, decreasing Δ13C values were obtained in the order leaves, twigs, wood and acorns, with the values from acorns often resembling those from 2019-year rings. The observed changes indicated an increased intrinsic water use efficiency and lack of starch reserve formation during the unprecedented hot and dry summer 2018. Qu. petraea revealed quite different values from Qu. robur (lower Δ13C, wider and denser year rings), but qualitatively showed the same reaction to the drought in 2018, except for an enhanced formation of tyloses in recent-year tree rings.
Author:Florian Süßel, Wolfgang Brüggemann
Parent Title (English):Trees, forests and people
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2021/05/11
Date of first Publication:2021/05/11
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/05/09
Tag:Drought; Oaks; Tree rings; Tylosis; Wood properties; Xylem
Issue:art. 100097
Page Number:10
First Page:1
Last Page:10
This work was funded by the research funding programme “LOEWE - Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz" of Hesse’s Ministry of Higher Education, Research, and Arts, by the Leibniz Association (Berlin) through the collaboration project “South Hesse Oak Project” between Senckenberg - Leibniz Institution for Biodiversity and Earth System Research and Goethe University Frankfurt and by the Association of Friends and Sponsors of the Johann Wolfgang Goethe-University, Frankfurt.
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 58 Pflanzen (Botanik) / 580 Pflanzen (Botanik)
Licence (German):License LogoCreative Commons - Namensnennung-Nicht kommerziell - Keine Bearbeitung 4.0