Anatomical Features of Permeable and Refractory Douglas-Fir

Anatomical features of Douglas-fir such as tracheid length, springwood lumen cross section, and diameters of the bordered pit-pair structures (aperture, torus, annulus) were analyzed statistically. They were then related to permeable and refractory behavior of Douglas-fir heartwood to liquid penetration. The average fiber length of the permeable group of woods is considerably longer than that of the refractory woods. The springwood lumen area is largest in the permeable woods. The permeable and refractory woods have bordered pit structures of the same diameter. Fibers of the permeable woods appear more hexagonal in cross section with a radial wall capable of supporting a double row of bordered pits; in the refractory woods the fibers are more square in cross section with one row of bordered pits on the radial wall.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member