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- W3204751612 abstract "Abstract 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 (δ 13 C) 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 δ 13 C (δ 13 C f ) measurement constraints, respectively. Our model‐data fusion showed that δ 13 C f can provide useful constraint on photosynthetic ( V cmax25 , the maximum rate of carboxylation at 25°C) and stomatal ( g 1, the slope of stomatal function) parameters as well as the posterior carbon fluxes. When including δ 13 C f measurement, g 1 spatially varies among the six sites and is significantly correlated with annual precipitation. We incorporated the statistical relationship between g 1 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 δ 13 C f data constrains carbon flux uncertainties across space." @default.
- W3204751612 created "2021-10-11" @default.
- W3204751612 creator A5054064307 @default.
- W3204751612 creator A5057772380 @default.
- W3204751612 date "2021-10-01" @default.
- W3204751612 modified "2023-10-17" @default.
- W3204751612 title "Leaf <sup>13</sup> C data constrain the uncertainty of the carbon dynamics of temperate forest ecosystems" @default.
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- W3204751612 doi "https://doi.org/10.1002/ecs2.3741" @default.
- W3204751612 hasPublicationYear "2021" @default.
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