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Zusammenfassung:
Plant temperature responses vary geographically, reflecting thermally contrasting habitats
and long-term species adaptations to their climate of origin. Plants also can acclimate to fast
temporal changes in temperature regime to mitigate stress. Although plant photosynthetic
responses are known to acclimate to temperature, many global models used to predict future
vegetation and climate–carbon interactions do not include this process.
We quantify the global and regional impacts of biogeographical variability and thermal
acclimation of temperature response of photosynthetic capacity on the terrestrial carbon (C)
cycle between 1860 and 2100 within a coupled climate–carbon cycle model, that emulates 22
global climate models.
Results indicate that inclusion of biogeographical variation in photosynthetic temperature
response is most important for present-day and future C uptake, with increasing importance
of thermal acclimation under future warming. Accounting for both effects narrows the range
of predictions of the simulated global land C storage in 2100 across climate projections (29%
and 43% globally and in the tropics, respectively).
Contrary to earlier studies, our results suggest that thermal acclimation of photosynthetic
capacity makes tropical and temperate C less vulnerable to warming, but reduces the warming-induced C uptake in the boreal region under elevated CO2.
