Plant traits controlling growth change in response to a drier climate. Issue 3 (6th November 2020)

• Record Type: Journal Article
• Authors: Rowland, Lucy; Oliveira, Rafael S.; Bittencourt, Paulo R. L.; Giles, Andre L.; Coughlin, Ingrid; Costa, Patricia de Britto; Domingues, Tomas; Ferreira, Leandro V.; Vasconcelos, Steel S.; Junior, João A. S.; Oliveira, Alex A. R.; da Costa, Antonio C. L.; Meir, Patrick; Mencuccini, Maurizio
• Is Part Of: New phytologist. Volume 229:Issue 3(2021)
• Page Start: 1363
• Page End: 1374
• Publication Date: 2020-11-06
• Subjects: plant functional traits -- drought -- light availability -- tropical forests ecosystem processes -- acclimation -- climate change -- intra‐specific variation -- tree growth; Botany -- Periodicals; 580
• DOI: 10.1111/nph.16972
• Languages: English
• ISSNs: 0028-646X

Abstract

Summary: Plant traits are increasingly being used to improve prediction of plant function, including plant demography. However, the capability of plant traits to predict demographic rates remains uncertain, particularly in the context of trees experiencing a changing climate. Here we present data combining 17 plant traits associated with plant structure, metabolism and hydraulic status, with measurements of long‐term mean, maximum and relative growth rates for 176 trees from the world's longest running tropical forest drought experiment. We demonstrate that plant traits can predict mean annual tree growth rates with moderate explanatory power. However, only combinations of traits associated more directly with plant functional processes, rather than more commonly employed traits like wood density or leaf mass per area, yield the power to predict growth. Critically, we observe a shift from growth being controlled by traits related to carbon cycling (assimilation and respiration) in well‐watered trees, to traits relating to plant hydraulic stress in drought‐stressed trees. We also demonstrate that even with a very comprehensive set of plant traits and growth data on large numbers of tropical trees, considerable uncertainty remains in directly interpreting the mechanisms through which traits influence performance in tropical forests.