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Seedlings of Scots pine and European larch were cultivated from seeds in pots in the growth chambers of a phytotron at constant day and night temperatures of 5°, 12°, 17°, 24°, or 27°C and 16 h photoperiod (70 percent relative air humidity, light intensity 100 Wm-2). Plant material was harvested 8, 11, and 16 weeks after germination for growth analysis and dry matter determination. At the same dates, gas exchange was measured at the following temperatures: 12°, 17°, 24°, 27°C. Chlorophyll content of juvenile needles was also determined. Larch seedlings were characterized by constant growth, while in pine seedlings growth was interrupted by periods of terminal bud formation. A highly significant correlation between temperature and chlorophyll content (r = 0.99) was observed in both species. The action of growth temperature on dry matter distribution among plant organs was different in pine and larch seedlings. Lower temperatures stimulated root growth and higher temperature stimulated needle growth in pine. Stem dry matter accumulation was always larger in larch than in pine. The Net Assimilation Rate and Relative Growth Rate were much larger in latch than in pine seedlings. A wide optimum temperature range for growth was found in both species. Forest Sci. 26:301-309.
Maître de Recherche at the Phytotron, Centre National de la Recherche Scientifique, 91190 Gif-sur-Yvette, France
Publication date: June 1, 1980
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Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.