earlywood造句

• No satisfactory explanation can as yet be given for the exact mechanisms determining the formation of earlywood and latewood.
• The tracheids of earlywood formed at the beginning of a growing season have large radial sizes and smaller, thinner cell walls.
• It is usually lighter in color than that near the outer portion of the ring, and is known as earlywood or springwood.
• In hard pines, on the other hand, the latewood is very dense and is deep-colored, presenting a very decided contrast to the soft, straw-colored earlywood.
• In good oak these large vessels of the earlywood occupy from 6 to 10 percent of the volume of the log, while in inferior material they may make up 25 % or more.
• Since the latewood of a growth ring is usually darker in color than the earlywood, this fact may be used in visually judging the density, and therefore the hardness and strength of the material.
• In diffuse-porous woods, as has been stated, the vessels or pores are even-sized, so that the water conducting capability is scattered throughout the ring instead of collected in the earlywood.
• If ease of working is prized, wood should be chosen with regard to its uniformity of texture and straightness of grain, which will in most cases occur when there is little contrast between the latewood of one season's growth and the earlywood of the next.