Accession Number:

AD0600857

Title:

PATTERN OF VARIATION OF FIBRIL ANGLE WITHIN ANNUAL RINGS OF PINUS ATTENURADIATA.

Descriptive Note:

Research note,

Corporate Author:

FOREST PRODUCTS LAB MADISON WIS

Personal Author(s):

Report Date:

1964-04-01

Pagination or Media Count:

13.0

Abstract:

The variation of fibril angle within and between rings was investigated in 10-year-old trees of two Pinus attenuradiata Stockwell and Righter clones. Within an annual ring, the fibril angles decreased from the beginning of the earlywood to the end of the latewood, following a linear trend. The fibril angles of the beginning of the earlywood tended to be larger than the angles in the latewood of the preceding annual ring. The trend within the ring did not appear to be modified by the amount of latewood in the annual ring or by the width of the ring. Between the first six to eight annual rings from the pith, no signficant radial trend was observed in the variation of the average fibril angles of the latewood or of the entire annual ring with the exception of one case where the trend was negative and parabolic. The fibril angles in compression wood followed the same general trends of variation within and between rings. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE