Apical Control of Diameter Growth in White Pine Branches
Abstract:Young white pine (Pinus strobus L.) trees were girdled at the top or bottom of stem internodes. Girdles either above or just below a whorl of branches caused (1) diameter increase at the base of the branches, (2) decreased stem growth in the internode below the whorl of branches. Ring width was greatest on the underside of branches when the girdle was above, but ring width was evenly distributed on all sides of the branches when the girdle was below. A girdle at the top of an internode stopped growth in that internode. A girdle at the bottom of an internode had no effect on, or increased, growth in that internode. Each girdle reduced stem volume growth more than it increased branch volume growth. Branch diameter growth appears to be regulated by competition between stem and branch sinks for branch-produced photosynthate. Forest Sci. 27:95-101.
Document Type: Journal Article
Affiliations: Professor, Department of Forestry and Wildlife Management, University of Massachusetts, Amherst, MA 01003
Publication date: 1981-03-01
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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.
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