Effect of Mechanical Stress on Growth and Anatomical Structure of Red Pine: Compression Stress
Date Published: 1975
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- Thomas Quirk, J.
Forest Products Laboratory, Forest Service, U.S. Department of Agriculture, Madison, Wisconsin - Freese, Frank
Forest Products Laboratory, Forest Service, U.S. Department of Agriculture, Madison, Wisconsin
Under natural conditions, the tree is stressed statically by the mass of the crown and bole. Pairs of steel rods drilled through two branch whorls were connected by turnbuckles to simulate increasing static load on a given internode. Level of soil moisture was included to discern its influence on the effect of static loading.
Compression and moisture stress each reduced radial growth. After computed loading exceeded the proportional limit, the next-formed fibers were greatly expanded radially and, when macerated, exhibited extreme twisting. The fibers produced before the proportional limit was exceeded exhibited compression failures when macerated.
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