ring-porous

Little is known about environmental controls on vessel features in ring-porous tree species.

The red oak group are ring-porous hardwoods and have pointed leaf edges.

In discussing such woods it is customary to divide them into two large classes, ring-porous and diffuse-porous.

Ring-porous wood is susceptible to cavitation because the large pores that are used for water transport easily freeze.

The effect of rate of growth is, therefore, not the same as in the ring-porous woods, approaching more nearly the conditions in the conifers.

Like many ring-porous woods, the springwood cells are very large which gives the wood a sharp, contrasting grain pattern, particularly when plain-sawn.

In the case of the ring-porous hardwoods there seems to exist a pretty definite relation between the rate of growth of timber and its properties.

In ring-porous woods of good growth it is usually the latewood in which the thick-walled, strength-giving fibers are most abundant.

Phenological comparison of the onset of vessel formation between ring-porous and diffuse-porous deciduous trees in a Japanese temperate forest.

Radiographs of transverse wood sections gave the best results in most cases, but radial sections of some ring-porous hardwoods provided superior data.

In ring-porous woods each season's growth is always well defined, because the large pores formed early in the season abut on the denser tissue of the year before.

Distribution of vessel ends in stems of some diffuse-porous and ring-porous trees: The nodal regions of "safety zones" of the water conducting system.

Cambial reactivation and xylogenesis have been studied in young oaks (ring-porous trees) and young beeches (diffuse-porous trees).

This, it must be remembered, applies only to ring-porous woods such as oak, ash, hickory, and others of the same group, and is, of course, subject to some exceptions and limitations.

Wood's that are coarse textured such oaks and other ring-porous hardwoods may need to be filled before they are finished to ensure the coating can bridge the pores and resist cracking.

In ring-porous woods the vessels of the early wood not infrequently appear on a finished surface as darker than the denser latewood, though on cross sections of heartwood the reverse is commonly true.

Anatomical characters of the early- and late-wood of individuals of a ring-porous oak (bur oak, Quercusmacrocarpa Michx.) growing in southeastern Nebraska display sensitivity to yearly variations in precipitation.

In the oak, a ring-porous tree, the cambium becomes active simultaneously throughout the bole; at the same time cambial reactivation, coming from swelling buds, proceeds from the upper part of the branches down the twigs.

In ring-porous species, such as ash, black locust, catalpa, chestnut, elm, hickory, mulberry, and oak, the larger vessels or pores (as cross sections of vessels are called) are localized in the part of the growth ring formed in spring, thus forming a region of more or less open and porous tissue.