Different hydraulic strategies under drought stress between Fraxinus mandshurica and Larix gmelinii seedlings

Persistent and severe drought induced by global climate change causes tree mortality mainly due to the hydraulic imbalance of conduit systems, but the magnitude of injury may be species dependent. A water-exclusion experiment was carried out on seedlings of two tree species with distinct characteris...

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Bibliographic Details
Published in:Journal of forestry research 2023-02, Vol.34 (1), p.99-111
Main Authors: Luo, Dandan, Wang, Chuankuan, Jin, Ying, Li, Zhimin, Wang, Zhaoguo
Format: Article
Language:English
Subjects:
Analysis
Animal behavior
Biomedical and Life Sciences
Climate change
Drought
Droughts
Embolism
Forestry
Fraxinus mandshurica
Global climate
Global temperature changes
Health aspects
Hydraulics
Larix gmelinii
Leaves
Life Sciences
Original Paper
Plant species
Safety margins
Seedlings
Segmentation
Stems
Stomata
Temperate forests
Water potential
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Summary:Persistent and severe drought induced by global climate change causes tree mortality mainly due to the hydraulic imbalance of conduit systems, but the magnitude of injury may be species dependent. A water-exclusion experiment was carried out on seedlings of two tree species with distinct characteristics, i.e., Fraxinus mandshurica and Larix gmelinii to examine hydraulic responses of leaf, stem, and root to drought stress. The two species displayed different hydraulic strategies and related traits in response to drought stress. L. gmelinii reduced its leaf hydraulic conductance by quick stomatal closure and a slow decline in leaf water potential, with a more isohydric stomatal regulation to maintain its water status. In contrast, F. mandshurica was more anisohydric with a negative stomatal safety margin, exhibiting strong resistance to embolism in stem and leaf-stem segmentation of hydraulic vulnerability to preserve the hydraulic integrity of stem. These differences in hydraulic behaviors and traits between the two species in response to drought stress provide a potential mechanism for their co-existence in temperate forests, including which in the forest modeling would improve our prediction of tree growth and distribution under future climate change.
ISSN:1007-662X
1993-0607
DOI:10.1007/s11676-021-01438-1