Fig. S1 Schematic diagram of the laboratory-based open 13CO2/12CO2 gas exchange cuvette, adapted for reference measurements of the isotopic composition of ecosystem respiration.

Fig. S2 Half-lives of CO2 concentration changes in chamber air, following abrupt changes in CO2 concentration of the incoming air.

Fig. S3 Air temperature, relative humiditiy and photosynthetic photon flux density (PPFD) during the labelling experiment.

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