TY  - JOUR
AU  - Santiago, L.S.
AU  - De Guzman, M.E.
AU  - Baraloto, C.
AU  - Vogenberg, J.E.
AU  - Brodie, M.
AU  - Hérault, B.
AU  - Fortunel, C.
AU  - Bonal, D.
PY  - 2018//
TI  - Coordination and trade-offs among hydraulic safety, efficiency and drought avoidance traits in Amazonian rainforest canopy tree species
T2  - New Phytol.
JO  - New Phytologist
SP  - 1015
EP  - 1024
VL  - 218
IS  - 3
PB  - Blackwell Publishing Ltd
KW  - Amazonian forest
KW  - cavitation
KW  - drought
KW  - hydraulic conductivity
KW  - sapwood capacitance
KW  - turgor loss point
KW  - wood density
KW  - xylem
KW  - climate change
KW  - forest canopy
KW  - forest ecosystem
KW  - rainforest
KW  - species diversity
KW  - tree
KW  - tropical forest
KW  - vulnerability
KW  - wood
KW  - Amazonia
KW  - French Guiana
KW  - Paracou
N2  - Predicting responses of tropical forests to climate change-type drought is challenging because of high species diversity. Detailed characterization of tropical tree hydraulic physiology is necessary to evaluate community drought vulnerability and improve model parameterization. Here, we measured xylem hydraulic conductivity (hydraulic efficiency), xylem vulnerability curves (hydraulic safety), sapwood pressure–volume curves (drought avoidance) and wood density on emergent branches of 14 common species of Eastern Amazonian canopy trees in Paracou, French Guiana across species with the densest and lightest wood in the plot. Our objectives were to evaluate relationships among hydraulic traits to identify strategies and test the ability of easy-to-measure traits as proxies for hard-to-measure hydraulic traits. Xylem efficiency was related to capacitance, sapwood water content and turgor loss point, and other drought avoidance traits, but not to xylem safety (P50). Wood density was correlated (r = −0.57 to −0.97) with sapwood pressure–volume traits, forming an axis of hydraulic strategy variation. In contrast to drier sites where hydraulic safety plays a greater role, tropical trees in this humid tropical site varied along an axis with low wood density, high xylem efficiency and high capacitance at one end of the spectrum, and high wood density and low turgor loss point at the other.
SN  - 0028646x (Issn)
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042168614&doi=10.1111%2fnph.15058&partnerID=40&md5=dbbecccab3fc1e885c0473d071770802
UR  - http://dx.doi.org/10.1111/nph.15058
N1  - Cited By :6; Export Date: 3 December 2018; Coden: Nepha; Correspondence Address: Santiago, L.S.; Department of Botany & Plant Sciences, University of California, 2150 Batchelor Hall, United States; email: santiago@ucr.edu; Funding details: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, FEDER 2014–2020; Funding details: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, Project; Funding details: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, GY0006894; Funding details: University of California, UC; Funding details: National Institute of Food and Agriculture, NIFA; Funding details: ANR-10-LABX-0025; Funding text 1: We would like to thank Benôıt Burban and Jean-Yves Goret for laboratory support, Jocelyn Cazal and Valentine Alt for skillfully climbing trees for samples, Aurelie Dourdain for database support, and Clement Stahl, John Sperry, Sean Gleason, Todd Dawson, Steve Davis, JoséLuiz Silva, Aleyda Acosta Rangel and three anonymous reviewers for comments and discussions on the data presented. The study has been supported by the TRY initiative on plant traits (http://www.try-db.org). The TRY initiative and database is hosted, developed and maintained by J. Kattge and G. Boenisch (Max Planck Institute for Biogeochemistry, Jena, Germany). TRY is currently supported by Future Earth/ bioDISCOVERY and the German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig. We also acknowledge the University of California, Botany and Plant Sciences Department and the USDA National Institute of Food and Agriculture for support. We are grateful to the CIRAD and the GFclim project (FEDER 2014–2020, Project GY0006894) for financial support of the Paracou research station. 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ID  - Santiago_etal2018
ER  -