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Research frontiers for improving our understanding of drought-induced tree and forest mortality

Henrik Hartmann 1 Catarina F. Moura 2, 1, 3 William R. L. Anderegg 4 Nadine K. Ruehr 5 Yann Salmon 6, 7 Craig D. Allen Stefan K. Arndt 8 David D. Breshears 9, 10 Hendrik Davi 11 David Galbraith 12 Katinka X. Ruthrof 13, 14 Jan Wunder 15, 16 Henry D. Adams 17 Jasper Bloemen 18, 19 Maxime Cailleret 20, 15 Richard Cobb 21 Arthur Gessler 15 Thorsten E. E. Grams 22 Steven Jansen 23 Markus Kautz 5 Francisco Lloret 24, 25 Michael O'Brien 26
Abstract : nitori Accumulating evidence highlights increased mortality risks for trees during severe drought, particularly under warmer temperatures and increasing vapour pressure deficit (VPD). Resulting forest die-off events have severe consequences for ecosystem services, biophysical and biogeochemical land-atmosphere processes. Despite advances in monitoring, modelling and experimental studies of the causes and consequences of tree death from individual tree to ecosystem and global scale, a general mechanistic understanding and realistic predictions of drought mortality under future climate conditions are still lacking. We update a global tree mortality map and present a roadmap to a more holistic understanding of forest mortality across scales. We highlight priority research frontiers that promote: (1) new avenues for research on key tree ecophysiological responses to drought; (2) scaling from the tree/plot level to the ecosystem and region; (3) improvements of mortality risk predictions based on both empirical and mechanistic insights; and (4) a global mong network of forest mortality. In light of recent and anticipated large forest die-off events such a research agenda is timely and needed to achieve scientific understanding for realistic predictions of drought-induced tree mortality. The implementation of a sustainable network will require support by stakeholders and political authorities at the international level.
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Submitted on : Tuesday, May 26, 2020 - 5:05:18 PM
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Henrik Hartmann, Catarina F. Moura, William R. L. Anderegg, Nadine K. Ruehr, Yann Salmon, et al.. Research frontiers for improving our understanding of drought-induced tree and forest mortality. New Phytologist, Wiley, 2018, 218 (1), pp.15 - 28. ⟨10.1111/nph.15048⟩. ⟨hal-02626328⟩



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