Drivers of leaf carbon exchange capacity across biomes at the continental scale

Nicholas Smith, Jeffrey S. Dukes

Research output: Contribution to journalArticle

Abstract

Abstract Realistic representations of plant carbon exchange processes are necessary to reliably simulate biosphere–atmosphere feedbacks. These processes are known to vary over time and space, though the drivers of the underlying rates are still widely debated in the literature. Here, we measured leaf carbon exchange in >500 individuals of 98 species from the Neotropics to high boreal biomes to determine the drivers of photosynthetic and dark respiration capacity. Covariate abiotic (long- and short-term climate) and biotic (plant type, plant size, ontogeny, water status) data were used to explore significant drivers of temperature-standardized leaf carbon exchange rates. Using model selection, we found the previous week's temperature and soil moisture at the time of measurement to be a better predictor of photosynthetic capacity than long-term climate, with the combination of high recent temperatures and low soil moisture tending to decrease photosynthetic capacity. Non-trees (annual a
Original languageEnglish
Pages (from-to)1610-1620
JournalEcology
DOIs
StatePublished - 2018

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