Drought-induced forest dieback Allen et al. (2010)
Events of forest diebacks
P. tremuloides (Canada)
N. dombeyi (Argentine)
P. sylvestris (Suisse)
Acacia sp. (Australie)
Carbon starvation or hydraulic failure?
Photo credits: Dr. Hervé Cochard (INRA, Clermont-Ferrand, France).
Drought-induced mortality: Is cavitation resistance a relevant trait? Angiosperms
Conifers
P50
1:1
Urli et al. 2013 Tree Phys Barigah et al 2013 AO
Brodribb and Cochard 2009 PP Brodribb et al. 2010 New Phytol
Different xylem embolism thresholds for catastrophic hydraulic failure
P88
Lethal water potential (-MPa)
1:1
Lethal water potential (-MPa)
Similar safety margins for angiosperms and conifers
Drought-induced xylem cavitation only occurs under severe drought
Grow th
The high-cavitation-resistance paradigm should be viewed as the only valid framework for understanding plant hydraulics and water relations
Delzon & Cochard 2014 New Phytol
The radiation of angiosperms vs. the decline of gymnosperms
Darwin's 'abominable mystery'.
H1 : The carbon hypothesis: Le LIÈVRE ET LA TORTUE (the tortoise and the hare)
We found angiosperms to have similar growth rates as conifers when resources are scarce. However, when the availability of resources is increased, angiosperm species tend to grow faster than coniferous species
H3. The climate hypothesis FROST and DROUGHT TOLERANCE
Sampling in Kew, Bedgebury, Sydney and Hobart
Cavitating the conifers of the world
Taxonomic diversity of conifers and species measured for cavitation resistance # species
Sampled species
228
86
41
25
190
57
1
1
133
70
11
4
23
8
627
264
Intra-specific variability (Pinus pinaster) The QST
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