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<front>
<journal-meta>
<journal-id journal-id-type="publisher">EGUsphere</journal-id>
<journal-title-group>
<journal-title>EGUsphere</journal-title>
<abbrev-journal-title abbrev-type="publisher">EGUsphere</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">EGUsphere</abbrev-journal-title>
</journal-title-group>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/egusphere-2026-5883</article-id>
<title-group>
<article-title>Spatial decoupling of drought exposure and growth loss in German forests during the 2018&amp;ndash;2022 drought sequence</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Pohl</surname>
<given-names>Felix</given-names>
<ext-link>https://orcid.org/0000-0003-1035-9781</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Neuwirth</surname>
<given-names>Burkhard</given-names>
<ext-link>https://orcid.org/0000-0001-7473-462X</ext-link>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Steger</surname>
<given-names>David</given-names>
<ext-link>https://orcid.org/0000-0001-7410-0010</ext-link>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Skiadaresis</surname>
<given-names>Georgios</given-names>
<ext-link>https://orcid.org/0000-0002-2385-0476</ext-link>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Heinrich</surname>
<given-names>Ingo</given-names>
<ext-link>https://orcid.org/0000-0001-5800-6999</ext-link>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Bogena</surname>
<given-names>Heye</given-names>
<ext-link>https://orcid.org/0000-0001-9974-6686</ext-link>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Müsgen-von den Driesch</surname>
<given-names>Marvin</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Thies</surname>
<given-names>Boris</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Bendix</surname>
<given-names>Jörg</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Leuchner</surname>
<given-names>Michael</given-names>
<ext-link>https://orcid.org/0000-0002-0927-2622</ext-link>
</name>
<xref ref-type="aff" rid="aff8">
<sup>8</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Blume</surname>
<given-names>Theresa</given-names>
<ext-link>https://orcid.org/0000-0003-3754-7571</ext-link>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hendricks-Franssen</surname>
<given-names>Harrie-Jan</given-names>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hildebrandt</surname>
<given-names>Anke</given-names>
<ext-link>https://orcid.org/0000-0001-8643-1634</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff9">
<sup>9</sup>
</xref>
<xref ref-type="aff" rid="aff10">
<sup>10</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Computational Hydrosystems, Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>DeLaWi Tree-Ring Analyses, Windeck, Germany</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Department of Environmental Sciences, University of Basel, Basel, Switzerland</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zurich, Switzerland</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Hydrology Section, GFZ Helmholtz Centre for Geosciences, Potsdam, Germany</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>Agrosphere Institute (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany</addr-line>
</aff>
<aff id="aff7">
<label>7</label>
<addr-line>Faculty of Geography, Laboratory for Climatology and Remote Sensing, Marburg University, Marburg, Germany</addr-line>
</aff>
<aff id="aff8">
<label>8</label>
<addr-line>Physical Geography and Climatology, Department of Geography, RWTH Aachen University, Aachen, Germany</addr-line>
</aff>
<aff id="aff9">
<label>9</label>
<addr-line>German Centre for Integrative Biodiversity Research Halle-Jena-Leipzig, Leipzig, Germany</addr-line>
</aff>
<aff id="aff10">
<label>10</label>
<addr-line>Institute of Geoscience, Friedrich Schiller University Jena, Jena, Germany</addr-line>
</aff>
<pub-date pub-type="epub">
<day>09</day>
<month>10</month>
<year>2026</year>
</pub-date>
<volume>2026</volume>
<fpage>1</fpage>
<lpage>44</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2026 Felix Pohl et al.</copyright-statement>
<copyright-year>2026</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/4.0/">https://creativecommons.org/licenses/by/4.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5883/">This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5883/</self-uri>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5883/egusphere-2026-5883.pdf">The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-5883/egusphere-2026-5883.pdf</self-uri>
<abstract>
<p>The 2018&amp;ndash;2022 drought sequence coincided with widespread forest stress in Central Europe, but tree-growth responses differed markedly among species and hydroclimatic settings. Here, we analyzed radial-growth responses along a west-east transect across Germany using a multi-site tree-ring network spanning five common forest species: European beech (&lt;em&gt;Fagus sylvatica&lt;/em&gt;), pedunculate oak (&lt;em&gt;Quercus robur&lt;/em&gt;), sessile oak (&lt;em&gt;Quercus petraea&lt;/em&gt;), Scots pine (&lt;em&gt;Pinus sylvestris&lt;/em&gt;), and Douglas fir (&lt;em&gt;Pseudotsuga menziesii&lt;/em&gt;). We assessed drought severity and duration using the Standardized Precipitation&amp;ndash;Evapotranspiration Index (SPEI, 1951&amp;ndash;2024) and estimated growth anomalies relative to the baseline of expected growth under neutral moisture conditions derived from hierarchical generalized additive mixed models.&lt;/p&gt;
&lt;p&gt;The 2018&amp;ndash;2022 period was the most severe multi-year drought event across the sampled regions at longer accumulation scales (SPEI-24 and SPEI-48), exhibiting exceptional persistence in severity and temporal extent. Growth losses peaked in 2019 for four of the five species, with annual anomalies in that year ranging from -21 to -42 %. Douglas fir responded already in 2018 and reached its strongest single-year deficit of the recent sequence in 2022 (&amp;asymp;-66 %). When integrated over five years, the recent sequence produced some of the strongest sustained growth deficits in the study period for most species within the sampled stands. Analysis across individual drought events suggests additional growth suppression at a given severity in beech and Douglas fir and less suppression in sessile oak during recent events.&lt;/p&gt;
&lt;p&gt;Despite the strong regional synchrony of the climatic driver, growth responses remained highly heterogeneous along the transect. Across all species, growth anomalies were less spatially coherent than the climatic driver, and this decoupling emerged even between neighboring stands under near-identical forcing. These results show that a climatically unprecedented, coherent drought produced growth impacts that were neither uniform nor predictable from regional water-balance severity, so that translating regional severity into stand-level growth losses requires additional information on local water availability and site context.</p>
</abstract>
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<funding-group>
<award-group id="gs1">
<funding-source>Bundesministerium für Ernährung und Landwirtschaft</funding-source>
<award-id>2220WK86A4</award-id>
<award-id>2220WK86B4</award-id>
</award-group>
</funding-group>
</article-meta>
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