Journal
NEW PHYTOLOGIST
Volume 219, Issue 1, Pages 37-44Publisher
WILEY
DOI: 10.1111/nph.15015
Keywords
activation energy; global change; growth; metabolic ecology; photosynthesis; primary production; scaling; temperature
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Funding
- Thomas R. Brown Family Foundation
- Los Alamos National Laboratory LDRD program
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Understanding how temperature influences the scaling of physiological rates through levels of biological organization is critical for predicting plant responses to climate. Metabolic theory predicts that many rates increase exponentially with temperature following an activation energy (E) of 0.32eV for photosynthesis. Here, I evaluate this prediction for net photosynthesis and organ, individual, and ecosystem growth. Observed E for photosynthesis varied widely but was not statistically different from predictions, while E for organs was greater than predicted, and E for individuals and ecosystems only weakly characterized temperature responses. I review several hypotheses that may underlie these results. Understanding how multiple rate-limiting processes coalesce into a single E that characterizes metabolic responses to temperature, and how to best estimate E from unimodal data, remain important challenges.
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