Previsual detection of stressed coniferous trees
<p>The study consisted of two parts: following the fade rates of killed field-grown Virginia pine (<u>Pinus virginiana</u> Mill.); and to study the effects of different stresses on seedlings.</p> <p> Foliage fade rates of killed field-grown Virginia pine varied with the...
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| Format: | Others |
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Virginia Tech
2014
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| Online Access: | http://hdl.handle.net/10919/41077 http://scholar.lib.vt.edu/theses/available/etd-02132009-172201/ |
| Summary: | <p>The study consisted of two parts: following the fade
rates of killed field-grown Virginia pine (<u>Pinus virginiana</u> Mill.); and to study the effects of different stresses on
seedlings.</p>
<p>
Foliage fade rates of killed field-grown Virginia pine
varied with the time of the year the tree was killed.
Little variation in fade rates was found between years.</p>
<p>
Foliage of seedlings grown under stress due to:
girdling; sevpring; defoliating; and drought, were studied
by paper chromntographv, cross sectioning, and photography.
The four pigments found appeared to decline proportionately
as the foliege went from green to red. An error in
technique resulted in uninterpretable needle cross sections.
Photography using black and white, black and white infrared,
color, and color infrared films gave no previsual detection
of stress.</p> === Master of Science |
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