spatial variability of aspen bark chlorophyll content in the winter
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Spatial Variability of Aspen Bark Chlorophyll Content In
the Winter
Justin Burman, EBIO 4100, Spring 2011
Winter EcologyMountain Research Station
University of Colorado, Boulder
Introduction
Colorado’s aspen trees
Why are they cool?
( trekkerphoto.com)
How are they Special?
Winter photosynthesis in their bark
Share a common root structure
Deciduous
Live in the sub alpine
Does chlorophyl content in the bark of Aspen trees differ within the winter depending on available sunlight ? (Barr and Potter, 1974)
What induces the chlorophyl with in the bark and why?
Prior studies indicated bark chlorophyl content is relative to age (Barr and Potter, 1974)
Chlorophyl In the Bark
Hypothesis
If winter chlorophyl production within Populus tremuloides is dependent on photoperiod than
the aspect of the tree will also affect the amount of chlorophyl produced.
MethodsVisually documented trees on Northerly and Southerly aspects
When selecting location and specific trees I paid special attention to;elevationtemperaturesize of tree
Take photographs of trees
Discussion
Potential flaws
Is aspect related to Chlorophyl concentration?
Other variables
Human error
Is it more closely related to the thickness of a stand?
Conclusion
Not significantly related to aspect
Other shading factors appear to be more influential.
Any other Questions?
ResourcesHalfpenny, James. Winter An Ecological Handboobook. Johnson Publishing, Boulder, CO. 1989
Marchand, Peter. Life in the Cold. University Press of New England, 1996
Barr, M. Potter, L. Chlorophylis and Carotenoids in Aspen Bark (Populus tremuloides). The Southwestern Naturalist, Vol. 19, No. 2 (Jul. 26, 1974), pp. 147-154
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