Sub-annual variability in historical water source use by Mediterranean riparian trees - Observatoire Hommes-Milieux Vallée du Rhône Accéder directement au contenu
Rapport Année : 2015

Sub-annual variability in historical water source use by Mediterranean riparian trees

Résumé

Our study investigated the seasonal variability in historical water source use of Fraxinus excelsior and Populus nigra. We utilized a new method which combines tree-ring isotopes and isotope modelling to determine how tree water use varied at the sub-annual level over 10 consecutive growing seasons (2000-2010). We conducted tree-ring micro-slicing to produce highly resolved cellulose δ18O records and back calculated the δ18O signature of the source water used for growth of each micro-slice. We compared these results to regional water δ18O signatures to infer seasonal hydrological partitioning. Fraxinus was dependent on non-growing and growing season rainfall from the vadose zone whilst Populus relied on hyporheic and regional groundwater. We observed a convergence in water use of both species from 2007 which is attributed to a decline in phreatic water access to Populus
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hal-04549463 , version 1 (17-04-2024)

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  • HAL Id : hal-04549463 , version 1

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Christopher Sargeant, Michael Bliss Singer. Sub-annual variability in historical water source use by Mediterranean riparian trees. University of St Andrews; University of California Santa Barbara. 2015. ⟨hal-04549463⟩
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