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

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 CO 2 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 CO 2 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 tomore » temperature and CO 2.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ORCiD logo [6] ;  [1] ;  [1]
  1. National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Division
  2. Texas Tech Univ., Lubbock, TX (United States). Dept. of Biological Sciences; Purdue Univ., West Lafayette, IN (United States). Dept. of Forestry and Natural Resources
  3. Cornell Univ., Ithaca, NY (United States). Dept. of Ecology and Evolutionary Biology
  4. Purdue Univ., West Lafayette, IN (United States). Dept. of Forestry and Natural Resources and Dept. of Biological Sciences
  5. Michigan State Univ., East Lansing, MI (United States). MSU AgBioResearch, Plant Resilience Inst. and Dept. of Biochemistry and Molecular Biology
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.
Publication Date:
Report Number(s):
BNL-206806-2018-JAAM
Journal ID: ISSN 1748-9326
Grant/Contract Number:
SC0012704; 2015-67003-23485; FC03-97ER62402/377 A010; SC0012972; 2015-67003-23489; 1049033; 1000026; FG02-91ER2002; FC03-97ER62402/A010
Type:
Published Article
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Name: Environmental Research Letters; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDA; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1459720
Alternate Identifier(s):
OSTI ID: 1459167