%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Limousin, J. M.
%A Rambal, S.
%A Ourcival, J. M.
%A Rocheteau, Alain
%A Joffre, R.
%A Rodriguez-Cortina, R.
%T Long-term transpiration change with rainfall decline in a Mediterranean Quercus ilex forest
%D 2009
%L fdi:010046254
%G ENG
%J Global Change Biology
%@ 1354-1013
%K drought ; ecohydrology ; hydraulic conductance ; leaf area index ; leaf water potential ; Mediterranean evergreen forest ; Quercus ilex ; throughfall exclusion ; transpiration
%M ISI:000268684200006
%N 9
%P 2163-2175
%R 10.1111/j.1365-2486.2009.01852.x
%U https://www.documentation.ird.fr/hor/fdi:010046254
%> https://www.documentation.ird.fr/intranet/publi/2009/08/010046254.pdf
%V 15
%W Horizon (IRD)
%X In the Mediterranean basin, precipitation is expected to decline as a consequence of climate change. The response of a Quercus ilex forest in southern France to such a decline in water availability was studied using a 4-year throughfall exclusion experiment. Seasonal courses of sap flow and leaf water potential were obtained from 2004 to 2007 and used to characterize tree water relations in a control and a dry treatment. The experiment reduced the average precipitation input to the soil by 29%, and resulted in a 23% reduction in annual transpiration. Soil water potential was significantly lower in the dry treatment only during summer drought, but transpiration was reduced all year round even during well-watered periods. Despite a tight stomatal control over transpiration, whole-tree hydraulic conductance was found to be lower in the trees growing in the driest conditions. This reduction in water transport capacity was observed jointly with a reduction in leaf transpiring area. Canopy leaf area decreased by 18% in the dry treatment as a consequence of the throughfall exclusion, which was found to validate the ecohydrological equilibrium theory.
%$ 072