Notes: Pressure Chamber Device to Collect Xylem Sap from Forest Trees
Abstract:Biologically active compounds such as growth hormones often are not identified for trees because only a small quantity of sap is available for analysis. Therefore, a large pressure chamber was designed, constructed, and used to collect xylem sap from sapling-sized Douglas-fir and western hemlock trees or branches. Highest sap yield was obtained in spring and lowest yield in winter. More sap was obtained from trees under higher water potential (low moisture stress). For 53 Douglas-fir trees, average yield was 58 ml, or about 81 ml/h; the maximum volume obtained from one tree was 180 ml. Application of this device, now used successfully for several years, should stimulate plant hormone research in conifers. Forest Sci. 28:219-222.
Document Type: Miscellaneous
Affiliations: Professor, Department of Forest Science, Oregon State University, Corvallis, OR 97331
Publication date: June 1, 1982
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
Forest Science is published bimonthly in February, April, June, August, October, and December.
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