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The relationship between photosynthesis and accumulated cold degree days (CDD) over the late growing season was examined at the shoot, ecosystem and landscape scales in a boreal cutover in eastern Canada predominated by black spruce ( Picea mariana  Mill. BSP), lowbush blueberry ( Vaccinium angustifolium  Ait.) and sheep laurel ( Kalmia angustifolia  L.). We calculated CDD as the sum of minimum daily temperatures below a 5 °C threshold. Light-saturated photosynthesis at the shoot level ( A  max ) of black spruce and  V. angustifolium  decreased steadily with increasing CDD once temperatures below the CDD threshold value became frequent in mid-September, whereas  K. angustifolia  showed a more irregular pattern. Tissue acclimation played an important role in the decrease in  A  max  as the season progressed, but only  V. angustifolium  showed decreasing foliar nitrogen concentrations.

Decreasing photosynthesis at different spatial scales during the late growing season on a boreal cutover