Document: DAV-3-29-1

Phenology of Aesculus glabra in relation to temporal patterns of resource availability in a northern Indiana forest.

HICKS, D.J.*

Manchester College, N. Manchester IN 46962 USA 1

Abstract:
A. glabra (Hippocastanaceae), Ohio buckeye, is one of the earliest tree species to leaf out in northern Indiana (late March) and to drop its leaves (late July). This phenology allows utilization of a temporally predictable period of high light availability before canopy leaf-out. Although the photosynthetic compensation point of A. glabra drops with leaf age, photosynthetic capacity and stomatal conductivity also drop, and it is unlikely that a carbon profit can be made under the closed canopy. Leaf lifespan is longer in sites with higher light availability. In contrast to light, soil resources were not less abundant during the closed-canopy period. A. glabra's ability to make use of the spring period of high light depends on unusually high photosynthesis and respiration rates, allowing rapid growth; broad temperature optimum for photosynthesis; high frost tolerance; and abundant, small-diameter xylem vessels, which reduce the risk of cavitation during freezing.

Keywords: Aesculus glabra, photosynthesis, phenology, Indiana

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This abstract is being presented at: 10:30 AM in session:
Poster Session #1: Light Relations.