Transpiration by Douglas Fir Using Lysimetersby Leo J. Fritschen, Univ of Washington, Seattle, United States,
Abstract: During the spring of 1971 a 28 m Douglas fir tree was installed in a weighing lysimeter. Some details of construction are presented. The weighing mechanism consisted of eleven lengths of butyl rubber tubing (15 m in length) wound in spiral form. Weight changes were determined by measuring the differential pressure between a live and dummy standpipe. This type of installation is low cost as compared with a mechanical balance type lysimeter. Some of the unique problems and solutions with this installation are presented. One of the major uses of the results was in modelling the physiological response of the tree to environmental factors.
Subject Headings: Measuring instruments | Trees | Water resources | Pressure measurement | Transpiration | Construction costs
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