Differences between tree stem CO2 efflux and O2 influx rates cannot be explained by internal CO2 transport or storage in large beech trees

Tree stem respiration (RS) is a substantial component of the forest carbon balance. The mass balance approach uses stem CO2 efflux and internal xylem fluxes to sum up RS, while the oxygen‐based method assumes O2 influx as a proxy of RS. So far, both approaches have yielded inconsistent results regar...

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