Rooting depth and xylem vulnerability are independent woody plant traits jointly selected by aridity, seasonality, and water table depth

Laughlin Daniel C., Siefert Andrew, Fleri Jesse R., Tumber-Dávila Shersingh Joseph, Hammond William M., Sabatini Francesco Maria, Damasceno Gabriella, Aubin Isabelle, Field Richard, Hatim Mohamed Z., Jansen Steven, Lenoir Jonathan, Lens Frederic, McCarthy James, Niinemets Ulo, Phillips Oliver L., Attorre Fabio, Bergeron Yves, Bruun Hans Henrik, Byun Chaeho, Ćušterevska Renata, Dengler Jürgen, De Sanctis Michele, Dolezal Jiri, Jiménez‐Alfaro Borja, Herault Bruno, Homeier Jürgen, Kattge Jens, Meir Patrick, Mencuccini Maurizio, Noroozi Jalil, Nowak Arkadiusz, Peñuelas Josep, Schmidt Marco, Skvorc Zeljko, Sultana Fahmida, Ugarte Rosina Magaña, Bruelheide Helge. 2023. Rooting depth and xylem vulnerability are independent woody plant traits jointly selected by aridity, seasonality, and water table depth. New Phytologist, 240 (5):dossier Remote sensing : 1774-1787.

https://doi.org/10.1111/nph.19276

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://doi.org/10.25829/idiv.3555-akwd44

Résumé : Evolutionary radiations of woody taxa within arid environments were made possible by multiple trait innovations including deep roots and embolism-resistant xylem, but little is known about how these traits have coevolved across the phylogeny of woody plants or how they jointly influence the distribution of species. We synthesized global trait and vegetation plot datasets to examine how rooting depth and xylem vulnerability across 188 woody plant species interact with aridity, precipitation seasonality, and water table depth to influence species occurrence probabilities across all biomes. Xylem resistance to embolism and rooting depth are independent woody plant traits that do not exhibit an interspecific trade-off. Resistant xylem and deep roots increase occurrence probabilities in arid, seasonal climates over deep water tables. Resistant xylem and shallow roots increase occurrence probabilities in arid, nonseasonal climates over deep water tables. Vulnerable xylem and deep roots increase occurrence probabilities in arid, nonseasonal climates over shallow water tables. Lastly, vulnerable xylem and shallow roots increase occurrence probabilities in humid climates. Each combination of trait values optimizes occurrence probabilities in unique environmental conditions. Responses of deeply rooted vegetation may be buffered if evaporative demand changes faster than water table depth under climate change.

Mots-clés Agrovoc : phylogénie, résistance à la sécheresse, plante ligneuse, changement climatique, xylème, légume racine, racine, facteur du milieu, système racinaire, rhizosphère, enracinement, paysage, espèce vulnérable