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Automatic Determination of Conductance, Transpiration, and Environmental Conditions in Forest Trees

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An automatic system was developed to determine water vapor conductance, transpiration, and environmental conditions for forest trees. A series of eight gas exchange cuvettes are mounted on platforms and connected to a computer in a nearby laboratory. The computer controls the acquisition of appropriate relative humidity, temperature, and light data and provides real-time analysis of needle or leaf conductance, transpirational flux density, and environmental conditions. Data were collected at hourly intervals throughout an entire season of water use. Missing data, resulting primarily from effects of nearby lightning strikes, was limited to 2.7 percent of a possible 35,288 measurements. Forest Sci. 27:817-827.

Keywords: Water vapor conductance

Document Type: Journal Article

Affiliations: Principal Plant Physiologist, Multiresource Management of Montane and Subalpine Zones, Central Rocky Mountains, USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, CO 80526

Publication date: December 1, 1981

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