Feedback between climate, land-atmosphere fluxes and structure in a forest ecosystem severely damaged by recent hot-droughts

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Abstract: Re-occurring dry and hot summers with high irradiance have caused irreversible damages in forest ecosystems across Central Europe, including the ICOS ecosystem associate site Hartheim (DE-Har). The site experienced irreversible damages to a Scots pine (Pinus sylvestris) plantation with a mortality of >50% of all P. sylvestris trees following the 2018 drought. Dead and fallen trees were generally not removed in the area surrounding the site. In the last 6 years, DE-Har has undergone a significant regime change in which increased light under the damaged/missing tree crowns has accelerated growth of deciduous understory trees. We use eddy covariance measurements from pre- and post-drought periods and combine them with ecophysiological measurements at the individual tree level to estimate effects on long-term carbon, energy and water fluxes. We find that CO2 uptake in summer is only about 40% of pre-drought uptake and that in the period 2019-2023 the site became an annual net carbon source, whereas 15 years ago the forest was a considerable CO2 sink. Ecophysiological measurements show that understory trees have higher transpiration and ecophysiological activity compared to the previously dominant P. sylvestris canopy. On a decadal scale, annual transpiration increased and the seasonality of fluxes was intensified, as can be seen on remote sensing products related to canopy greenness such as satellite-based vegetation indices and phenocams. The observed changes altogether provide information on how forests that reached tipping points transition functionally and structurally and how this affects interactions between land and atmosphere

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch
Notes
ICOS Science Conference 2024, Versailles, France, 09.09.2024-13.09.2024

Keyword
Dürrestress
Dürre
Wald
Kiefernwald
Verdunstung
Treibhausgas
Kohlendioxid
Klima
Fernerkundung

Event
Veröffentlichung
(where)
Freiburg
(who)
Universität
(when)
2024
Creator
Contributor
SFB 1537: ECOSENSE - Skalenübergreifende Quantifizierung von Ökosystemprozessen in ihrer räumlich-zeitlichen Dynamik mittels smarter autonomer Sensornetzwerke

DOI
10.6094/UNIFR/256883
URN
urn:nbn:de:bsz:25-freidok-2568838
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
15.08.2025, 7:32 AM CEST

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Time of origin

  • 2024

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