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Stand-level, canopy foliar carbon loss ( R  can ) was modeled for a virtual  Quercus rubra  L. monoculture at two sites differing in soil water availability in a northeastern deciduous forest (USA) throughout the 2003 growing season. Previously reported foliar respiratory temperature responses of  Q. rubra  were used to parameterize a full distributed physiology model that estimates  R  can  by integrating the effects of season, site and canopy position, and represents the best estimation of  R  can . Model sensitivity to five simplified parameterization scenarios was tested, and a reasonable procedure of simplification was established. Neglecting effects of season, site or canopy position on respiration causes considerable relative error in  R  can  estimation. By contrast, assuming a constant  E  0  (a temperature response variable of the respiration model), or a constant night temperature (mean nighttime temperature) caused only a small relative error (&lt; 10%) compared with the full model. From June 8 to October 28, 2003, modeled  R  can  of the virtual  Q. rubra  monoculture was, on average, 45.3 mmol CO 2  m −2  night −1  on a ground-area basis (or 334 mmol CO 2  kg −1  night −1  on a biomass basis) and 101 mmol CO 2  m −2  night −1  (or 361 mmol CO 2  kg −1  night −1 ) at the drier site and the more mesic site, respectively. To model  R  can  of  Q. rubra  (or other  Quercus  species with similar respiratory properties), variations in the base respiration rate across season, site and canopy position need to be fully accounted for, but  E  0  may be assumed constant. Modeling  R  can  at the mean nighttime temperature would not strongly affect estimated canopy carbon loss.

Scaling foliar respiration to the stand level throughout the growing season in a Quercus rubra forest