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The Seasonal Course of Respiration and Photosynthesis in Strobili of Scots Pine

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Abstract:

The respiration of current and 1-year-old cones of Scots pine was investigated on excised cones during one season. The cones were collected in a 20-year-old stand of Scots pine in central Sweden. The respiration rate at 15°C showed pronounced seasonal variation and in light some of the carbon dioxide released in respiration was refixed. The average refixation capacity of 1-year-old cones was 60 percent and of current conelets 79 percent at light saturation. The seasonal performance of cone respiration was estimated, using records of air temperature and photon flux densities from the stand from which the cones were collected. The refixation of carbon dioxide reduced respiratory losses by 31 percent. Calculated on a carbon basis, the respiration cost of cone production was 50 percent of the final cone weight after correction for carbon refixation. Cones covered with aluminium foil in mid-July had lower seed weight than the controls had when harvested in late October. Forest Sci. 27:267-276.

Keywords: Pinus sylvestris; cone respiration

Document Type: Journal Article

Affiliations: Section of Forest Ecophysiology, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden

Publication date: June 1, 1981

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