Leaf carbon isotope discrimination and vegetative responses of Dryas octopetala to temperature and water manipulations in a High Arctic polar semi-desert, Svalbard

Oecologia ◽  
1993 ◽  
Vol 95 (4) ◽  
pp. 463-469 ◽  
Author(s):  
J. M. Welker ◽  
P. A. Wookey ◽  
A. N. Parsons ◽  
M. C. Press ◽  
T. V. Callaghan ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
High Arctic ◽  
Isotope Discrimination ◽  
Dryas Octopetala

scholarly journals Effects of Manipulated Precipitation and Shading on Cassiope tetragona Growth and Carbon Isotope Discrimination: A High Arctic Field Study

2013 ◽  
Vol 45 (1) ◽  
pp. 132-142 ◽  
Author(s):  
Stef Weijers ◽  
Lia Auliaherliaty ◽  
Richard van Logtestijn ◽  
Jelte Rozema
Keyword(s):  
Field Study ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
High Arctic ◽  
Isotope Discrimination ◽  
Cassiope Tetragona

Carbon Isotope Discrimination and Gas Exchange of Cowpea Accessions and Hybrids

Crop Science ◽  
1993 ◽  
Vol 33 (4) ◽  
pp. 788-793 ◽  
Author(s):  
Abdelbagi M. Ismail ◽  
Anthony E. Hall
Keyword(s):  
Gas Exchange ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination

Heritability of Carbon Isotope Discrimination and Correlations with Earliness in Cowpea

Crop Science ◽  
1995 ◽  
Vol 35 (3) ◽  
pp. 673-678 ◽  
Author(s):  
Cristina M. Menéndez ◽  
Anthony E. Hall
Keyword(s):  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination

Overexpression of C4Phosphoenolpyruvate Carboxylase Increased Carbon Isotope Discrimination in Transgenic Rice Plants

2001 ◽  
Vol 4 (4) ◽  
pp. 311-312 ◽  
Author(s):  
Sakae Agarie ◽  
Haruto Sasaki ◽  
Makoto Matsuoka ◽  
Mitsue Miyao-Tokutomi
Keyword(s):  
Carbon Isotope ◽  
Transgenic Rice ◽  
Carbon Isotope Discrimination ◽  
Isotope Discrimination ◽  
Rice Plants ◽  
Transgenic Rice Plants

scholarly journals Associations between partitioning of carboxylase activity and bundle sheath leakiness to CO2, carbon isotope discrimination, photosynthesis, and growth in sugarcane

1996 ◽  
Vol 47 (7) ◽  
pp. 907-914 ◽  
Author(s):  
Nicanor Z. Saliendra ◽  
Frederick C. Meinzer ◽  
Matthew Perry ◽  
Margaret Thom
Keyword(s):  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Bundle Sheath ◽  
Carboxylase Activity ◽  
Isotope Discrimination

scholarly journals An observational constraint on stomatal function in forests: evaluating coupled carbon and water vapor exchange with carbon isotopes in the Community Land Model (CLM4.5)

2016 ◽  
Vol 13 (18) ◽  
pp. 5183-5204 ◽  
Author(s):  
Brett Raczka ◽  
Henrique F. Duarte ◽  
Charles D. Koven ◽  
Daniel Ricciuto ◽  
Peter E. Thornton ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Carbon Isotope ◽  
Carbon Isotopes ◽  
Nitrogen Limitation ◽  
Carbon Isotope Discrimination ◽  
Stable Carbon Isotope ◽  
Atmospheric Co2 ◽  
Stable Carbon ◽  
Isotope Discrimination ◽  
Community Land Model

Abstract. Land surface models are useful tools to quantify contemporary and future climate impact on terrestrial carbon cycle processes, provided they can be appropriately constrained and tested with observations. Stable carbon isotopes of CO2 offer the potential to improve model representation of the coupled carbon and water cycles because they are strongly influenced by stomatal function. Recently, a representation of stable carbon isotope discrimination was incorporated into the Community Land Model component of the Community Earth System Model. Here, we tested the model's capability to simulate whole-forest isotope discrimination in a subalpine conifer forest at Niwot Ridge, Colorado, USA. We distinguished between isotopic behavior in response to a decrease of δ13C within atmospheric CO2 (Suess effect) vs. photosynthetic discrimination (Δcanopy), by creating a site-customized atmospheric CO2 and δ13C of CO2 time series. We implemented a seasonally varying Vcmax model calibration that best matched site observations of net CO2 carbon exchange, latent heat exchange, and biomass. The model accurately simulated observed δ13C of needle and stem tissue, but underestimated the δ13C of bulk soil carbon by 1–2 ‰. The model overestimated the multiyear (2006–2012) average Δcanopy relative to prior data-based estimates by 2–4 ‰. The amplitude of the average seasonal cycle of Δcanopy (i.e., higher in spring/fall as compared to summer) was correctly modeled but only when using a revised, fully coupled An − gs (net assimilation rate, stomatal conductance) version of the model in contrast to the partially coupled An − gs version used in the default model. The model attributed most of the seasonal variation in discrimination to An, whereas interannual variation in simulated Δcanopy during the summer months was driven by stomatal response to vapor pressure deficit (VPD). The model simulated a 10 % increase in both photosynthetic discrimination and water-use efficiency (WUE) since 1850 which is counter to established relationships between discrimination and WUE. The isotope observations used here to constrain CLM suggest (1) the model overestimated stomatal conductance and (2) the default CLM approach to representing nitrogen limitation (partially coupled model) was not capable of reproducing observed trends in discrimination. These findings demonstrate that isotope observations can provide important information related to stomatal function driven by environmental stress from VPD and nitrogen limitation. Future versions of CLM that incorporate carbon isotope discrimination are likely to benefit from explicit inclusion of mesophyll conductance.

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