The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. This dataset can be used to address theoretical questions about plant strategy and trade‐offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters.

Motivation: The Tundra Trait Team (TTT) database includes field‐based measurements of key traits related to plant form and function at multiple sites across the tundra biome. Treier, Jean-Pierre Tremblay, Maxime Tremblay, Susanna Venn, Anna-Maria Virkkala, Tage Vowles, Stef Weijers, Martin Wilmking, Sonja Wipf, Tara Zamin Tape, Marcello Tomaselli, Andrew Trant, Urs A. Spasojevic, James David Mervyn Speed, Lorna E. Rumpf, Gabriela Schaepman-Strub, Philipp Semenchuk, Rohan Shetti, Nadejda A. Onipchenko, Alessandro Petraglia, Catherine Pickering, Janet S. Morgan, Martin Alfons Mörsdorf, Jacob Nabe-Nielsen, Sigrid Schøler Nielsen, Josep M. Mack, Rabia Mathakutha, Anders Michelsen, Ann Milbau, Ulf Molau, John W. Little, Miska Luoto, Petr Macek, Michelle C. Lamarque, Trevor Lantz, Amanda Lavalle, Jonas J. Iversen, Francesca Jaroszynska, Borja Jiménez-Alfaro, Jill Johnstone, Rasmus Halfdan Jorgensen, Elina Kaarlejärvi, Rebecca Klady, Jitka Klimešová, Annika Korsten, Sara Kuleza, Aino Kulonen, Laurent J. Hollister, James Hudson, Karl Hülber, Colleen M.

Good, Oriol Grau, Peter Green, Michelle Greve, Paul Grogan, Sylvia Haider, Tomáš Hájek, Martin Hallinger, Konsta Happonen, Karen A. Dickinson, Stefan Dullinger, Bo Elberling, Anu Eskelinen, Bruce C. Björk, Daan Blok, Helge Bruelheide, Agata Buchwal, Allan Buras, Michele Carbognani, Katherine Christie, Laura S. Alatalo, Heather Alexander, Alba Anadon-Rosell, Sandra Angers-Blondin, Yang Bai, Gaurav Baruah, Mariska te Beest, Logan Berner, Robert G.

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