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Title: Carbon dioxide stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment

Abstract

We report that elevated atmospheric CO2 (eCO2) often increases photosynthetic CO2 assimilation (A) in field studies of temperate tree species. However, there is evidence that A may decline through time due to biochemical and morphological acclimation, and environmental constraints. Indeed, at the free-air CO2 enrichment (FACE) study in Oak Ridge, Tennessee, A was increased in 12-year-old sweetgum trees following 2 years of ~ 40 % enhancement of CO2. A was re-assessed a decade later to determine if the initial enhancement of photosynthesis by eCO2 was sustained through time. Measurements were conducted at prevailing CO2 and temperature on detached, re-hydrated branches using a portable gas exchange system. Photosynthetic CO2 response curves (A versus the CO2 concentration in the intercellular air space (Ci); or A-Ci curves) were contrasted with earlier measurements using leaf photosynthesis model equations. Relationships between light-saturated photosynthesis (Asat), maximum electron transport rate (Jmax), maximum Rubisco activity (Vcmax), chlorophyll content and foliar nitrogen (N) were assessed. In 1999, Asat for eCO2 treatments was 15.4± 0.8 μmol m-2 s-1, 22 % higher than aCO2 treatments (P<0.01). By 2009, Asat declined to <50 % of 1999 values, and there was no longer a significant effect of eCO2 (Asat =6.9 or 5.7±more » 0.7 μmol m-2 s-1 for eCO2 or aCO2, respectively). In 1999, there was no treatment effect on area-based foliar N; however, by 2008, N content in eCO2 foliage was 17% less than that in aCO2 foliage. Photosynthetic N-use efficiency (Asat : N) was greater in eCO2 in 1999 resulting in greater Asat despite similar N content, but the enhanced efficiency in eCO2 trees was lost as foliar N declined to sub-optimal levels. There was no treatment difference in the declining linear relationships between Jmax or Vcmax with declining N, or in the ratio of Jmax : Vcmax through time. Ultimately, results suggest that the initial enhancement of photosynthesis to elevated CO2 will not be sustained through time if N becomes limited.« less

Authors:
 [1];  [1];  [2];  [1];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Macquarie Univ., NSW (Australia)
  3. Univ. of Western Sydney, Richmond, NSW (Australia)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1185630
Alternate Identifier(s):
OSTI ID: 1261417
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
AoB Plants
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-2851
Publisher:
Oxford University Press; Annals of Botany Company
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; Acclimation; down-regulation; free-air CO2 enrichment; nitrogen limitation; sweetgum.; 54 ENVIRONMENTAL SCIENCES; sweetgum

Citation Formats

Warren, Jeffrey M., Jensen, Anna M., Medlyn, Belinda E., Norby, Richard J., and Tissue, David T. Carbon dioxide stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment. United States: N. p., 2014. Web. doi:10.1093/aobpla/plu074.
Warren, Jeffrey M., Jensen, Anna M., Medlyn, Belinda E., Norby, Richard J., & Tissue, David T. Carbon dioxide stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment. United States. https://doi.org/10.1093/aobpla/plu074
Warren, Jeffrey M., Jensen, Anna M., Medlyn, Belinda E., Norby, Richard J., and Tissue, David T. 2014. "Carbon dioxide stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment". United States. https://doi.org/10.1093/aobpla/plu074. https://www.osti.gov/servlets/purl/1185630.
@article{osti_1185630,
title = {Carbon dioxide stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment},
author = {Warren, Jeffrey M. and Jensen, Anna M. and Medlyn, Belinda E. and Norby, Richard J. and Tissue, David T.},
abstractNote = {We report that elevated atmospheric CO2 (eCO2) often increases photosynthetic CO2 assimilation (A) in field studies of temperate tree species. However, there is evidence that A may decline through time due to biochemical and morphological acclimation, and environmental constraints. Indeed, at the free-air CO2 enrichment (FACE) study in Oak Ridge, Tennessee, A was increased in 12-year-old sweetgum trees following 2 years of ~ 40 % enhancement of CO2. A was re-assessed a decade later to determine if the initial enhancement of photosynthesis by eCO2 was sustained through time. Measurements were conducted at prevailing CO2 and temperature on detached, re-hydrated branches using a portable gas exchange system. Photosynthetic CO2 response curves (A versus the CO2 concentration in the intercellular air space (Ci); or A-Ci curves) were contrasted with earlier measurements using leaf photosynthesis model equations. Relationships between light-saturated photosynthesis (Asat), maximum electron transport rate (Jmax), maximum Rubisco activity (Vcmax), chlorophyll content and foliar nitrogen (N) were assessed. In 1999, Asat for eCO2 treatments was 15.4± 0.8 μmol m-2 s-1, 22 % higher than aCO2 treatments (P<0.01). By 2009, Asat declined to <50 % of 1999 values, and there was no longer a significant effect of eCO2 (Asat =6.9 or 5.7± 0.7 μmol m-2 s-1 for eCO2 or aCO2, respectively). In 1999, there was no treatment effect on area-based foliar N; however, by 2008, N content in eCO2 foliage was 17% less than that in aCO2 foliage. Photosynthetic N-use efficiency (Asat : N) was greater in eCO2 in 1999 resulting in greater Asat despite similar N content, but the enhanced efficiency in eCO2 trees was lost as foliar N declined to sub-optimal levels. There was no treatment difference in the declining linear relationships between Jmax or Vcmax with declining N, or in the ratio of Jmax : Vcmax through time. Ultimately, results suggest that the initial enhancement of photosynthesis to elevated CO2 will not be sustained through time if N becomes limited.},
doi = {10.1093/aobpla/plu074},
url = {https://www.osti.gov/biblio/1185630}, journal = {AoB Plants},
issn = {2041-2851},
number = ,
volume = 7,
place = {United States},
year = {Mon Nov 17 00:00:00 EST 2014},
month = {Mon Nov 17 00:00:00 EST 2014}
}

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Cited by: 49 works
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Works referenced in this record:

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Increases in nitrogen uptake rather than nitrogen-use efficiency support higher rates of temperate forest productivity under elevated CO2
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Elevated CO2 concentration affects leaf photosynthesis-nitrogen relationships in Pinus taeda over nine years in FACE
journal, April 2008


PROGRESSIVE NITROGEN LIMITATION OF ECOSYSTEM PROCESSES UNDER ELEVATED CO 2 IN A WARM-TEMPERATE FOREST
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Forest water use and water use efficiency at elevated CO 2 : a model-data intercomparison at two contrasting temperate forest FACE sites
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Elevated CO2 response of photosynthesis depends on ozone concentration in aspen
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Increases in nitrogen uptake rather than nitrogen-use efficiency support higher rates of temperate forest productivity under elevated CO2
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Works referencing / citing this record:

Intraspecific variation in juvenile tree growth under elevated CO 2 alone and with O 3 : a meta-analysis
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Different ways to die in a changing world: Consequences of climate change for tree species performance and survival through an ecophysiological perspective
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Different ways to die in a changing world: Consequences of climate change for tree species performance and survival through an ecophysiological perspective
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Precipitation regulates plant gas exchange and its long-term response to climate change in a temperate grassland
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