Previsual detection of stressed coniferous trees
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The study consisted of two parts: following the fade rates of killed field-grown Virginia pine (Pinus virginiana Mill.); and to study the effects of different stresses on seedlings.
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.
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.
- Masters Theses