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

De Kauwe, Martin G.; Medlyn, Belinda E.; Zaehle, Sönke; Walker, Anthony P.; Dietze, Michael C.; Wang, Ying-Ping; Luo, Yiqi; Jain, Atul K.; El-Masri, Bassil; Hickler, Thomas; Warlind, David; Weng, Ensheng; Parton, William J.; Thornton, Peter E.; Wang, Shusen; Prentice, I. Colin; Asao, Shinichi; Smith, Benjamin; McCarthy, Heather R.; Iversen, Colleen M.; Hanson, Paul J.; Warren, Jeffrey M.; Oren, Ram; Norby, Richard J.

doi:10.1111/nph.12847

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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

MPS-Authors

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Zaehle, Sönke
Terrestrial Biosphere Modelling , Dr. Sönke Zähle, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;
Terrestrial Biosphere Modelling , Dr. Sönke Zähle, Department Biogeochemical Integration, Prof. Dr. Martin Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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http://dx.doi.org/10.1111/nph.12847
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引用

De Kauwe, M. G., Medlyn, B. E., Zaehle, S., Walker, A. P., Dietze, M. C., Wang, Y.-P., Luo, Y., Jain, A. K., El-Masri, B., Hickler, T., Warlind, D., Weng, E., Parton, W. J., Thornton, P. E., Wang, S., Prentice, I. C., Asao, S., Smith, B., McCarthy, H. R., Iversen, C. M., Hanson, P. J., Warren, J. M., Oren, R., & Norby, R. J. (2014). 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. New Phytologist, 203(3), 883-899. doi:10.1111/nph.12847.

引用: https://hdl.handle.net/11858/00-001M-0000-0019-876E-F

要旨

Elevated atmospheric CO2 concentration (eCO2) has the potential to increase vegetation
carbon storage if increased net primary production causes increased long-lived biomass.
Model predictions of eCO2 effects on vegetation carbon storage depend on how allocation
and turnover processes are represented.
We used data from two temperate forest free-air CO2 enrichment (FACE) experiments to
evaluate representations of allocation and turnover in 11 ecosystem models.
Observed eCO2 effects on allocation were dynamic. Allocation schemes based on functional
relationships among biomass fractions that vary with resource availability were best able
to capture the general features of the observations. Allocation schemes based on constant
fractions or resource limitations performed less well, with some models having unintended
outcomes. Few models represent turnover processes mechanistically and there was wide variation
in predictions of tissue lifespan. Consequently, models did not perform well at predicting
eCO2 effects on vegetation carbon storage.
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. Data from intensively studied ecosystem manipulation
experiments are invaluable for constraining models and we recommend that such
experiments should attempt to fully quantify carbon, water and nutrient budgets.