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Causes of the Winter Decline in Transpiration and Photosynthesis in Some Evergreens

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Transpiration, measured by the cut-leaf method, was greatly retarded during the cold season in Rhododendron catawbiense Michx., Kalmia latifolia L., and Pinus nigra Arn. growing out-of-doors in New Haven, Conn. Stomatal opening, measured by observing leaf replicas under the microscope, was at least roughly related to the seasonal changes in transpiration. The winter decline in transpiration was clearly not related to changes in leaf water content, but the spring increase in percent of stomata open, and in transpiration, was related to a decline in leaf moisture in spite of continued ample soil moisture. Cold hardiness, related only in a general way to stomatal opening and transpiration, was more closely related to photosynthesis, the latter being measured under constant temperature and illumination in leaves cut from the plants. Despite an apparent relationship between stomatal opening and photosynthesis, it is suggested that photosynthesis is curtailed by a nonstomatal factor, probably biochemical, such as a sugar increase. Hardiness, more closely related to starch conversion than to total sugar levels, may be related to the seasonal changes in photosynthesis through this biochemical change.

Document Type: Journal Article

Affiliations: Assistant Professor, Yale School of Forestry, New Haven, Conn.

Publication date: June 1, 1963

More about this publication?
  • 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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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