Where does the carbon go? A model-data intercomparison of vegetation carbon allocation and turnover processes at two temperate forest free-air CO2 enrichment sites.
Bottom Line: Observed eCO2 effects on allocation were dynamic.Allocation schemes based on constant fractions or resource limitations performed less well, with some models having unintended outcomes.Our recommendations to reduce uncertainty include: use of allocation schemes constrained by biomass fractions; careful testing of allocation schemes; and synthesis of allocation and turnover data in terms of model parameters.
Affiliation: Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia.Show MeSH
Related in: MedlinePlus
Mentions: Figure 1 shows the average measured and modelled Callocation coefficients in the ambient treatments over the experimental period at both sites. Atboth sites, the observations indicate that the largest fraction of NPP goes to wood, but at Duke thewood allocation fraction is greater, and the root allocation fraction lower, than at ORNL. Overall,the models agree with the observations that the greatest fraction of NPP was allocated to woodytissue at both sites, with notable exceptions being LPJ-GUESS and O-CN at Duke, and O-CN and TECO atORNL. Most differences among models in their prediction of allocation fractions at ambientCO2 arise from parameterisation; these differences are discussed in the Notes S2.
Affiliation: Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia.