Periodic Root and Shoot Growth in Oak

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The number of growth flushes per growing season, the length of rest periods between flushes, and the relationship between shoot and root growth were evaluated in oak seedlings (Quercus alba, Q. marilandica), trees (Q. alba), and stump sprouts (Q. alba, Q. velutina). In both seedlings and trees, root growth was reduced during shoot growth. Under constant environmental conditions, seedlings underwent a series of very synchronous flushes of leaf and shoot growth and these flushes were separated by distinctive rest periods. It was only while leaves and shoots were not growing that root growth occurred to any appreciable extent. Under field conditions, flushes of growth were still observed in stump sprouts, but were no longer synchronous. In understory seedlings and in large trees, only one flush was observed. Forest Sci. 26:590-598.

Keywords: Quercus alba; Quercus marilandica; Quercus velutina; water stress

Document Type: Journal Article

Affiliations: College of Forest Resources, University of Washington, Seattle, WA 98195

Publication date: December 1, 1980

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