Seasonal trends in photosynthesis and leaf traits in scarlet oak
Abstract
Understanding seasonal variation in photosynthesis is important for understanding and modelling plant productivity. Here, we used shotgun sampling to examine physiological, structural and spectral leaf traits of upper canopy, sun-exposed leaves in Quercus coccinea Münchh (scarlet oak) across the growing season in order to understand seasonal trends, explore the mechanisms underpinning physiological change, and investigate the impact of extrapolating measurements from a single date to the whole season. We tested the hypothesis that photosynthetic rates and capacities would peak at the summer solstice i.e., at the time of peak photoperiod. Contrary to expectations, our results reveal a late-season peak in both photosynthetic capacity and rate before the expected sharp decrease at the start of senescence. This late-season maximum occurred after the higher summer temperatures and VPD, and was correlated with the recovery of leaf water content and increased stomatal conductance. We modelled photosynthesis at the top of the canopy and found that the simulated results closely tracked the maximum carboxylation capacity of Rubisco. For both photosynthetic capacity and modelled top-of-canopy photosynthesis, the maximum value was therefore not observed at the summer solstice. Rather, in each case the measurements at and around the solstice were close to the overall seasonal mean,more »
- Authors:
-
[2]
- Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Cambridge (United Kingdom)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1762760
- Report Number(s):
- BNL-220902-2021-JAAM
Journal ID: ISSN 0829-318X
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Tree Physiology
- Additional Journal Information:
- Journal Volume: 41; Journal Issue: 8; Journal ID: ISSN 0829-318X
- Publisher:
- Oxford University Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Burnett, Angela C., Serbin, Shawn P., Lamour, Julien, Anderson, Jeremiah, Davidson, Kenneth J., Yang, Dedi, and Rogers, Alistair. Seasonal trends in photosynthesis and leaf traits in scarlet oak. United States: N. p., 2021.
Web. doi:10.1093/treephys/tpab015.
Burnett, Angela C., Serbin, Shawn P., Lamour, Julien, Anderson, Jeremiah, Davidson, Kenneth J., Yang, Dedi, & Rogers, Alistair. Seasonal trends in photosynthesis and leaf traits in scarlet oak. United States. https://doi.org/10.1093/treephys/tpab015
Burnett, Angela C., Serbin, Shawn P., Lamour, Julien, Anderson, Jeremiah, Davidson, Kenneth J., Yang, Dedi, and Rogers, Alistair. Mon .
"Seasonal trends in photosynthesis and leaf traits in scarlet oak". United States. https://doi.org/10.1093/treephys/tpab015. https://www.osti.gov/servlets/purl/1762760.
@article{osti_1762760,
title = {Seasonal trends in photosynthesis and leaf traits in scarlet oak},
author = {Burnett, Angela C. and Serbin, Shawn P. and Lamour, Julien and Anderson, Jeremiah and Davidson, Kenneth J. and Yang, Dedi and Rogers, Alistair},
abstractNote = {Understanding seasonal variation in photosynthesis is important for understanding and modelling plant productivity. Here, we used shotgun sampling to examine physiological, structural and spectral leaf traits of upper canopy, sun-exposed leaves in Quercus coccinea Münchh (scarlet oak) across the growing season in order to understand seasonal trends, explore the mechanisms underpinning physiological change, and investigate the impact of extrapolating measurements from a single date to the whole season. We tested the hypothesis that photosynthetic rates and capacities would peak at the summer solstice i.e., at the time of peak photoperiod. Contrary to expectations, our results reveal a late-season peak in both photosynthetic capacity and rate before the expected sharp decrease at the start of senescence. This late-season maximum occurred after the higher summer temperatures and VPD, and was correlated with the recovery of leaf water content and increased stomatal conductance. We modelled photosynthesis at the top of the canopy and found that the simulated results closely tracked the maximum carboxylation capacity of Rubisco. For both photosynthetic capacity and modelled top-of-canopy photosynthesis, the maximum value was therefore not observed at the summer solstice. Rather, in each case the measurements at and around the solstice were close to the overall seasonal mean, with values later in the season leading to deviations from the mean by up to 41% and 52% respectively. Overall, we found that the expected Gaussian pattern of photosynthesis was not observed. We conclude that an understanding of species- and environment-specific changes in photosynthesis across the season is essential for correct estimation of seasonal photosynthetic capacity.},
doi = {10.1093/treephys/tpab015},
journal = {Tree Physiology},
number = 8,
volume = 41,
place = {United States},
year = {Mon Jan 25 00:00:00 EST 2021},
month = {Mon Jan 25 00:00:00 EST 2021}
}
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