Potential processes leading to winter reddening of young Douglas-fir Pseudotsuga menziesii in Europe - Archive ouverte HAL
Article Dans Une Revue Annals of Forest Science Année : 2024

Potential processes leading to winter reddening of young Douglas-fir Pseudotsuga menziesii in Europe

Résumé

Key message Winter reddening of young Douglas-fir ( Pseudotsuga menziesii Mirb. Franco), triggered by large thermal fluctuations in late winter, is a critical problem for European forestry. A literature review identified certain climatic conditions that are characteristic of ‘reddening’ years, including warm daily temperatures, high daily temperature amplitude, low relative humidity, moderate wind speeds, as well as the occurrence of freeze-thaw cycles with cold night temperatures. By describing the triggering environmental and stand factors, we propose three hypotheses for the physiological processes leading to winter reddening, namely (i) hydraulic failure due to winter drought stress, (ii) photo-oxidative stress in shade-acclimated trees, and (iii) early cold deacclimation during warm periods. i) Low soil temperature, by reducing root water uptake, combined with anticyclonic conditions, by increasing water losses, can induce hydraulic failure in the xylem. Hydraulic failure may be further accelerated by night frosts. ii) Winter reddening can occur when low temperature and high irradiance coincide, disrupting photostasis. Overwhelming of winter photo-protection may lead to photodamage and subsequent reddening. iii) Warm periods, by inducing cold deacclimation, make trees susceptible to frost damage. Finally, the three processes may interact under atypical anticyclonic conditions in late winter ( e.g. cold or dry soils, warm days, high irradiance and/or freezing nights). Indeed, trees under water stress would develop a higher sensitivity to freezing night and photooxidative stress. We therefore proposed mitigation actions to avoid exposing trees to stressful conditions based on e.g. stand characteristics, understorey vegetation and planting.
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Dates et versions

hal-04690288 , version 1 (06-09-2024)

Identifiants

Citer

Mahaut van Rooij, Thierry Améglio, Olivier Baubet, Nathalie Bréda, Guillaume Charrier. Potential processes leading to winter reddening of young Douglas-fir Pseudotsuga menziesii in Europe. Annals of Forest Science, 2024, 81 (1), pp.30. ⟨10.1186/s13595-024-01242-x⟩. ⟨hal-04690288⟩
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