NDLI: Evidence of hydraulic lift in a young beech and oak mixed forest using 18O soil water labelling

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Evidence of hydraulic lift in a young beech and oak mixed forest using 18O soil water labelling

Content Provider	Springer Nature Link
Author	Zapater, Marion Hossann, Christian Bréda, Nathalie Bréchet, Claude Bonal, Damien Granier, André
Copyright Year	2011
Abstract	Hydraulic lift (HL) by tree roots in a young, broad-leaved, mixed temperate European forest was investigated during the 2008 growing season by injecting 18O-enriched soil water at a depth of 75–90 cm under drought conditions experimentally imposed in a rain-exclusion system. Based on sap flow, leaf water potential, 2-D root distribution measurements, soil isotope profiles, and xylem water isotope composition, water acquisition and use by two tree species, beech (Fagus sylvatica) and oak (Quercus petraea) was compared. We showed that, unlike oak, beech experienced a marked decrease in sap flow and predawn leaf water potential with increasing soil drought. This behaviour was logical considering the shallower root system in beech than in oak. Six days after 18O-labelling, we observed isotopic enrichment in the shallower soil layers. Since the intermediate soil layers did not display any enrichment, our results clearly pointed to hydraulic lift by tree roots. The superficial enrichment that was observed in the vicinity of oak trunks and the increase in the isotopic signature of xylem sap in the oak trees but not in the beech trees confirmed the predominant role of oak in the hydraulic lift at our site. Even though facilitation for water acquisition among species was not observed here, our results suggest a potential positive contribution of species like oak toward maintaining species diversity in mixed forest ecosystems submitted to severe drought events.
Starting Page	885
Ending Page	894
Page Count	10
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	25
Issue Number	5
e-ISSN	14322285
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Deciduous mixed forest Drought Fagus sylvatica Isotopic labelling Quercus petraea Tree roots Plant Anatomy/Development Agriculture Plant Sciences Plant Physiology Plant Pathology Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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