Leaf13C data constrain the uncertainty of the carbon dynamics of temperate forest ecosystems

Liu, Shaoqing; Zhuang, Qianlai

doi:10.1002/ecs2.3741

Leaf¹³C data constrain the uncertainty of the carbon dynamics of temperate forest ecosystems

Journal Article · Sun Oct 03 00:00:00 EDT 2021 · Ecosphere

DOI:https://doi.org/10.1002/ecs2.3741· OSTI ID:1976318

Liu, Shaoqing ^[1]; Zhuang, Qianlai ^[2]

Purdue University, West Lafayette, IN (United States); University of Minnesota, Twin Cities, MN (United States); Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, Indiana, USA
Purdue University, West Lafayette, IN (United States)

Stable carbon isotope discrimination occurred in plant biophysical and biogeochemical processes can help understand plant physiology and soil biogeochemistry with respect to carbon cycling. Here, we incorporated the photosynthetic carbon isotope discrimination into a process-based land surface model (iTEM) to test if stable carbon isotope composition (δ¹³C) can impose additional constraint on model parameters. Sequential data assimilation was implemented at six eddy covariance flux tower sites using carbon flux observations including gross primary productivity (GPP) and net ecosystem exchange (NEE) with and without considering foliar δ¹³C (δ¹³C_f) measurement constraints, respectively. Our model-data fusion showed that δ¹³C_f can provide useful constraint on photosynthetic (V_cmax25, the maximum rate of carboxylation at 25°C) and stomatal (g1, the slope of stomatal function) parameters as well as the posterior carbon fluxes. When including δ¹³C_f measurement, g1 spatially varies among the six sites and is significantly correlated with annual precipitation. We incorporated the statistical relationship between g1 and annual precipitation into iTEM, which is then used to quantify the regional carbon dynamic in temperate forest ecosystems of the Northern Hemisphere. Compared with the simulation only conditioned on carbon flux observations, regional carbon flux estimations performed slightly better against the FLUXCOM products and the uncertainties of modeled carbon fluxes were reduced by 27%. Our study demonstrated that δ¹³C_f data constrains carbon flux uncertainties across space.

View Accepted Manuscript (DOE)

Research Organization:: Purdue University, West Lafayette, IN (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER64599

OSTI ID:: 1976318

Journal Information:: Ecosphere, Journal Name: Ecosphere Journal Issue: 10 Vol. 12; ISSN 2150-8925

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Leaf13C data constrain the uncertainty of the carbon dynamics of temperate forest ecosystems

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