Comparison of CO<sub>2</sub> and O<sub>2</sub> fluxes demonstrate retention of respired CO<sub>2</sub> in tree stems from a range of tree species
- Hilman, B.
- Muhr, J.
- Trumbore, S.
- Carbone, M.
- Yuval, P.
- Wright, S.
- Moreno, G.
- Pérez‑Priego, O.
- Migliavacca, M.
- Carrara, A.
- Grünzweig, J.
- Osem, Y.
- Weiner, T.
- Angert, A.
DOIAbstract
The ratio of CO2 efflux to O2 influx (ARQ, apparent respiratory quotient) in tree stems is expected to be 1.0 for carbohydrates, the main substrate supporting stem respiration. In previous studies of stem fluxes, ARQ values below 1.0 were observed and hypothesized to indicate retention of respired carbon within the stem. Here, we demonstrate that stem ARQ<1.0 values are common across 85 tropical, temperate, and Mediterranean forest trees from 9 different species. Mean ARQ values per species per site ranged from 0.39 to 0.78, with an overall mean of 0.59. Assuming that O2 uptake provides a measure of in situ stem respiration (due to the low solubility of O2), the overall mean indicates that on average 41% of CO2 respired in stems is not emit...
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