Does the Oscilloscope Technique Reveal the Dormancy Status of Douglas-fir and Ponderosa Pine?
Abstract:The oscilloscope technique was systematically compared to a standard method of determining dormancy depth on test populations of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] and ponderosa pine (Pinus ponderosa Laws.) under two watering regimes. We examined the properties of the electrical circuit formed by the oscilloscope technique to provide an analytical framework for interpreting waveforms and to permit an objective choice of waveform characteristics useful for the comparison. Waveform distortion inherent to the technique would otherwise confound the results. Correlation between the standard method and the chosen waveform characteristic was not found in late summer and fall, although winter correlation was good. This indicates that, at least in its present form, the oscilloscope technique is not suitable for determining the physiological fitness of these species for lifting. Forest Sci. 27:405-412.
Document Type: Journal Article
Affiliations: Professor of Forest Ecology, Department of Forest Science, School of Forestry, Oregon State University, Corvallis, Oregon 97331
Publication date: 1981-06-01
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