Preliminary indications for diverging heat and drought sensitivities in Norway spruce and Scots pine in Central Europe

doi:10.3832/ifor3216-012

Preliminary indications for diverging heat and drought sensitivities in Norway spruce and Scots pine in Central Europe

iForest - Biogeosciences and Forestry, Volume 13, Issue 2, Pages 89-91 (2020)
doi: https://doi.org/10.3832/ifor3216-012
Published: Mar 01, 2020 - Copyright © 2020 SISEF

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Massive and increasing tree mortality is currently observed in the two conifer species Norway spruce and Scots pine in Central Europe. Consecutive dry years are made responsible for this phenomenon. Leaf trait measurements, in specific leaf osmotic potential (π_osm) and leaf water potential at turgor loss (π_tlp), indicate that the underlying mechanisms for tree mortality are most likely different between the two species. π_tlp of spruce was highly negative, revealing a potentially high drought tolerance of the species. π_tlp of Scots pine was less negative, suggesting a higher susceptibility to drought stress. I conclude that the mortality of Norway spruce might be caused by rising temperatures and that the summer temperatures in the past years were beyond the species thermal tolerance threshold. Overall, I want to highlight and enhance the discussion that the search for suitable species for a climate change adapted forest should go in both directions, i.e., species should be chosen to make the forest fit for both increasing drought and heat stress.

Keywords

Tree Mortality, Water Stress, Heat Stress, Physiological Limitations, Conifers

Authors’ address

(1)

0000-0002-5602-6221
Conservation Ecology Center, Smithsonian Conservation Biology Institute, Front Royal, VA (USA)

(2)

0000-0002-5602-6221
Center for Tropical Forest Science - Forest Global Earth Observatory, Smithsonian Tropical Research Institute, Panama (Republic of Panama)

Corresponding author

Norbert Kunert
norbert.kunert@waldbau.uni-freiburg.de

Citation

Kunert N (2020). Preliminary indications for diverging heat and drought sensitivities in Norway spruce and Scots pine in Central Europe. iForest 13: 89-91. - doi: 10.3832/ifor3216-012

Academic Editor

Tamir Klein

Paper history

Received: Aug 18, 2019
Accepted: Dec 11, 2019

First online: Mar 01, 2020
Publication Date: Apr 30, 2020
Publication Time: 2.70 months

Open Access

This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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