Elevated CO₂ increases tree-level intrinsic water use efficiency insights from carbon and oxygen isotope analyses in tree rings across three forest FACE sites

Elevated CO₂ increases tree-level intrinsic water use efficiency : insights from carbon and oxygen isotope analyses in tree rings across three forest FACE sites

© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 197(2013), 2 vom: 01. Jan., Seite 544-554
1. Verfasser: Battipaglia, Giovanna (VerfasserIn)
Weitere Verfasser: Saurer, Matthias, Cherubini, Paolo, Calfapietra, Carlo, McCarthy, Heather R, Norby, Richard J, Francesca Cotrufo, M
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2013
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Carbon Isotopes Oxygen Isotopes Water 059QF0KO0R Carbon Dioxide 142M471B3J
Beschreibung
Zusammenfassung:© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust.
Elevated CO₂ increases intrinsic water use efficiency (WUE(i) ) of forests, but the magnitude of this effect and its interaction with climate is still poorly understood. We combined tree ring analysis with isotope measurements at three Free Air CO₂ Enrichment (FACE, POP-EUROFACE, in Italy; Duke FACE in North Carolina and ORNL in Tennessee, USA) sites, to cover the entire life of the trees. We used δ¹³C to assess carbon isotope discrimination and changes in water-use efficiency, while direct CO₂ effects on stomatal conductance were explored using δ¹⁸O as a proxy. Across all the sites, elevated CO₂ increased ¹³C-derived water-use efficiency on average by 73% for Liquidambar styraciflua, 77% for Pinus taeda and 75% for Populus sp., but through different ecophysiological mechanisms. Our findings provide a robust means of predicting water-use efficiency responses from a variety of tree species exposed to variable environmental conditions over time, and species-specific relationships that can help modelling elevated CO₂ and climate impacts on forest productivity, carbon and water balances
Beschreibung:Date Completed 21.05.2013
Date Revised 20.04.2021
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.12044