DIFERENTES ESTRATEGIAS EN LAS DINÁMICAS DE FLUJO DE SAVIA Y NICHO HIDROLÓGICO DE ÁRBOLES DOMINANTES EN EL DESIERTO SONORENSE POSIBILITAN SU COEXISTENCIA

Translated title of the contribution: DIFFERENT STRATEGIES IN SAP FLOW DYNAMICS AND HYDROLOGICAL NICHE OF DOMINANT SONORAN DESERT TREES ENABLE THEIR COEXISTENCE

Enrique Martínez-Núñez, Alejandro E. Castellanos*, Shishir Basant, Christian Ortega, Brad P. Wilcox, Enrico A. Yépez, Julio C.Y. Rodríguez, José R. Romo-León

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Plants in arid ecosystems exhibit adaptive traits to periodic droughts. It is predicted that droughts will become more frequent and intense due to global change. Studying plant ecophysiological traits will help understand their adaptations to water limitations. In arid ecosystems of northwestern Mexico, evergreen and deciduous trees coexist, with little knowledge of their responsible hydrological functional traits. Questions: What are the differences in drought resistance and hydraulic traits for coexisting trees in a semi-arid community? Are we able to determine their coexistence mechanisms? Studied species: Olneya tesota, Ipomoea arborescens and Jatropha cordata. Study site and dates: Desert shrubland/subtropical shrubland community in central Sonora, Mexico, in 2021. Methods: Sap flux density (Fd) was measured continuously with heat dissipation method probes, and predawn (Ψpd), midday (Ψmd) water potentials and stomatal conductance (gs) during the summer wet season. Results: Olneya (evergreen) was found to maintain Fd throughout the year, but Ipomoea and Jatropha (deciduous) only during the wet summer season. The maximum Fd of Ipomoea and Jatropha (~1,200 g cm-2 day-1) were two times higher than Olneya (600 g cm-2 day-1). During dry spells, deciduous trees decreased their Fd. Water potentials and stomatal conductances allowed differentiation of the hydrologic niches of isohydric (Ipomoea and Jatropha) and anisohydric (O. tesota) functional types. Conclusions: We found a gradient of diminishing drought resistance from Ipomoea, Jatropha to Olneya. These species enhanced coexistence because of their hydrological niches, determined by their sap flow, iso-anisohydric strategies, and rooting depths.

Translated title of the contributionDIFFERENT STRATEGIES IN SAP FLOW DYNAMICS AND HYDROLOGICAL NICHE OF DOMINANT SONORAN DESERT TREES ENABLE THEIR COEXISTENCE
Original languageSpanish
Pages (from-to)995-1015
Number of pages21
JournalBotanical Sciences
Volume101
Issue number4
DOIs
StatePublished - Oct 2023

Bibliographical note

Publisher Copyright:
© 2023 Sociedad Botanica de Mexico, A.C. All rights reserved.

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