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Title: Triose phosphate limitation in photosynthesis models reduces leaf photosynthesis and global terrestrial carbon storage

Journal Article · · Environmental Research Letters

Triose phosphate utilization (TPU)-limited photosynthesis occurs when carbon export from the Calvin-Benson cycle cannot keep pace with carbon inputs and processing. This condition is poorly constrained by observations but may become an increasingly important driver of global carbon cycling under future climate scenarios. However, the consequences of including or omitting TPU limitation in models have seldom been quantified. In this work, we assess the impact of changing the representation of TPU limitation on leaf- and global-scale processes. At the leaf scale, TPU limits photosynthesis at cold temperatures, high CO2 concentrations, and high light levels. Consistent with leaf-scale results, global simulations using the Community Land Model version 4.5 illustrate that the standard representation of TPU limits carbon gain under present day and future conditions, most consistently at high latitudes. If the assumed TPU limitation is doubled, further restricting photosynthesis, terrestrial ecosystem carbon pools are reduced by 9 Pg by 2100 under a business-as-usual scenario. The impact of TPU limitation on global terrestrial carbon gain suggests that CO2 concentrations may increase more than expected if models omit TPU limitation, and highlights the need to better understand when TPU limitation is important, including variation among different plant types and acclimation to temperature and CO2.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDA; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Food and Agriculture (NIFA)
Grant/Contract Number:
FC03-97ER62402/A010; FG02-91ER2002; SC0012704; SC0012972; 2015-67003-23485; FC03-97ER62402/377 A010; 2015-67003-23489; 1049033; 1000026; FG02-91ER20021
OSTI ID:
1459720
Alternate ID(s):
OSTI ID: 1459167; OSTI ID: 1603664
Report Number(s):
BNL-206806-2018-JAAM
Journal Information:
Environmental Research Letters, Journal Name: Environmental Research Letters Vol. 13 Journal Issue: 7; ISSN 1748-9326
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Beyond Static Benchmarking: Using Experimental Manipulations to Evaluate Land Model Assumptions journal October 2019
Changes in Wood Biomass and Crop Yields in Response to Projected CO 2 , O 3 , Nitrogen Deposition, and Climate journal October 2018
Model Structure and Climate Data Uncertainty in Historical Simulations of the Terrestrial Carbon Cycle (1850–2014) journal October 2019
Triose phosphate utilization and beyond: from photosynthesis to end product synthesis journal March 2019
Is triose phosphate utilization involved in the feedback inhibition of photosynthesis in rice under conditions of sink limitation? journal July 2019
Is triose phosphate utilization important for understanding photosynthesis? journal October 2019
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No evidence for triose phosphate limitation of light‐saturated leaf photosynthesis under current atmospheric CO 2 concentration journal August 2019
Genotypic variation in source and sink traits affects the response of photosynthesis and growth to elevated atmospheric CO 2 journal December 2019
Decadal fates and impacts of nitrogen additions on temperate forest carbon storage: a data–model comparison journal January 2019
The biophysics, ecology, and biogeochemistry of functionally diverse, vertically and horizontally heterogeneous ecosystems: the Ecosystem Demography model, version 2.2 – Part 1: Model description journal January 2019