| 单词 | heartwood |
| 例句 | All of its internal life exists within three paper-thin layers of tissue—the phloem, xylem, and cambium—just beneath the bark, which together form a moist sleeve around the dead heartwood. A Walk in the Woods 1997-11-01T00:00:00Z He nodded and took it carefully, running his fingertips over the heartwood, testing the strength of the string. The Reader 2016-01-12T00:00:00Z He sees tall ranks of firs swaying in a storm, hears their heartwood groan. All the Light We Cannot See 2014-05-06T00:00:00Z The kinds of wood — ash, heartwood, walnut, or curly maple—each had been brought when he asked. Gathering Blue 2000-01-01T00:00:00Z Ishmael pushed two slabs of fir heartwood into the fire in the cook stove. Snow Falling on Cedars: A Novel 1994-09-12T00:00:00Z Like, you’re invulnerable, except to an arrow made of the heartwood of a hawthorn tree, which just so happens to be the exact kind of arrow that your worst enemy favors. The Cruel Prince 2018-01-02T00:00:00Z Inside, suspended from the ceiling, is a single sculpture made of cedar and purple heartwood. Review: Aaron Flint Jamison’s Craft of Technology 2015-08-20T04:00:00Z If the students were looking at the damage, Johnston was seeing the healing, the way the tree was beginning to wrap the exposed heartwood with enclosing sapwood. An arborist muses on a 35-year career high in the branches 2016-10-04T04:00:00Z Shocked to see blue overhead, I burst out laughing, the sound filling the space where the tree’s heartwood should be, bouncing off its hollowed insides. California’s Highway 1, With Memory Riding Shotgun 2018-10-01T04:00:00Z Even within the mainstream tree-care industry, Johnston says, a lot of risks are overstated and work is oversold, with the idea that any tree with some decayed heartwood is ready to collapse. An arborist muses on a 35-year career high in the branches 2016-10-04T04:00:00Z He was left surveying a stack of heartwood. In These New Essays, John McPhee Finds Poetry in the Material at Hand 2018-12-17T05:00:00Z In passages like that, “Greenwood” penetrates to the core of things — or, as Christie puts it, the “heartwood.” It’s 2038. The World Is Dust and Forests Are Scarce. 2020-02-25T05:00:00Z On its surface, Grade is affixing row after row of tiny hollowed-out cubes of African heartwood, with a mix of dark and light grains. Art of decay: John Grade's fascinating sculptures crave disintegration 2011-05-29T01:58:15Z Meaning that while the tree is alive, the fungus is actively decaying the roots and the heartwood in the lower portion of the trunk. What killed this boxwood? Experts provide advice to keep your garden thriving 2023-01-10T05:00:00Z The death-pitted dormant tree looks ahead without a flicker in its heartwood. Poem: ‘Diptych: Abscission and Marcescence’ 2022-09-30T04:00:00Z Though dozens of mills have closed over the decades, trucks still hurtle down Highway 20 carrying stacks of hulking redwoods, easy to distinguish by their crimson heartwood. A war to halt logging in Northern California reignites. Will it end differently this time? 2022-02-19T05:00:00Z The central core, or heartwood, is the strongest wood in the tree even though it’s no longer alive. Become an Outdoor Scientist 2021-05-29T04:00:00Z A cavity is likely to occur the first time the top is removed and the heartwood is exposed, Cuttitte says. What to consider before you top that tree | Provided by Eastside Tree Works 2019-08-22T04:00:00Z Ax-wielding carpenters hack at tree trunks to create the castle’s roof beams — a single beam from the heartwood of each tree. A medieval castle in France could be the salvation of Notre Dame cathedral 2019-06-06T04:00:00Z In the inner layer, of heartwood, resin blocks much of the xylem. Tree sleuths are using DNA tests and machine vision to crack timber crimes 2019-04-02T04:00:00Z It’s made of cedar heartwood - the strongest part of a cedar tree. Gyp Hills shows revival after wildfire 2017-03-24T04:00:00Z This is equivalent to millions of rosewood trees as only the dark, dense heartwood is used: 70-80% of the tree is often wasted. Wildlife summit cracks down on illegal rosewood trade 2016-09-29T04:00:00Z And roughly two-thirds of all the carbon is stored in their heartwood, which lasts hundreds of years even after the trees die. Majestic redwood forests are also amazing fighters against global warming 2016-07-11T04:00:00Z The house walls are 18 inches thick made out of oak heartwood with concrete supports. Master of ingenuity: makes new home by repurposing old stuff 2015-05-23T04:00:00Z There, a rare old-growth coast redwood had been brutally hacked about 15 times by poachers, a chain saw massacre that had exposed the tree’s deep red heartwood. Poachers Attack Beloved Elders of California, Its Redwoods 2014-04-09T01:13:19Z Mr. Coakley said the authorities underestimate the impact of poaching activity because they only tally logs—the more valuable sections of sandalwood trees that contain the so-called heartwood. Illegal Loggers Tap Australian Prize 2013-12-27T23:40:50Z Old trees have idiosyncratic features - a different canopy, different branch systems, a lot of cavities, thicker bark and more heartwood. Green Blog: Mighty Old Trees Are Perishing Fast, Study Warns 2012-12-07T22:57:04Z The wood of the holly is even-grained and hard, especially when from the heartwood of large trees, and almost as white as ivory, except near the centre of old trunks, where it is brownish. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 5 "Hinduism" to "Home, Earls of" 2012-03-25T02:00:05.717Z The heartwood apparently rots rapidly in juniper trees, but the sapwood remains intact for many years—even after the tree is lying on the ground. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z Lying on the ground, fresh splinters of its pale-peach-colored heartwood extrude from a sleeve of bark. City Room: Autumn Unfolds:Damage Below, but Better News Above 2011-11-04T15:00:19Z The heartwood is distinctly red, and the sapwood white, this color combination making very striking effects when finished for cedar chests, closets, and interior woodwork. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z No distinct heartwood; color white, resin ducts very small, not numerous. Wood and Forest 2011-03-01T03:00:42.647Z At the core of the tree is the unchanging heartwood, while at its periphery are the areas of growth and change. Science books address string theory, advanced computing, history of the universe 2010-04-13T04:00:00Z The Goa powder or araroba is contained in the trunk, filling crevices in the heartwood. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 "Aram, Eugene" to "Arcueil" The dark-brown or red heartwood is very tough, hard and heavy. The Forests of Mount Rainier National Park The heartwood is of superior quality and value. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z It loses its protoplasm and starch and becomes heartwood, in which all cells are dead and serve only the mechanical function of holding up the great weight of the tree and in resisting wind pressures. Wood and Forest 2011-03-01T03:00:42.647Z The portions which are obstructed constitute the duramen or heartwood, the pervious portion the alburnum or sapwood. The Church of England Magazine - Volume 10, No. 263, January 9, 1841 Very heavy and long continuing must have been the ice on these to thus permanently crook their red heartwood. Old Plymouth Trails This region, deprived of its function, goes completely dry, like the heartwood of the tree, and it is into such material as this that the woodpecker succeeds in drilling his well-protected home. The Meaning of Evolution The wood is hard, strong, coarse-grained, with light, reddish-brown heartwood and thin lighter-colored sapwood. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z Certain insects burrow in and eat the heartwood. Conservation Reader The heartwood is fairly durable when exposed to the weather or in contact with the soil. Seasoning of Wood Nearly all the larger trees in the Fuegian forests have the heartwood decayed, and are worthless as timber. The Land of Fire A Tale of Adventure A raw material obtained from the heartwood of this plant, used in the preparation of tannins and brown dyes. Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada The heartwood is bright orange in color, turning brown upon exposure. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z Very young trees are all sapwood, but, as they get older, part of the wood is no longer needed to carry sap and it becomes heartwood. Studies of Trees They then enter the wood and continue their excavations deep into the sapwood or heartwood until they attain their normal size. Seasoning of Wood See cruel. heart-shaped, a. cordate, cordiform. heartwood, n. duramen. hearty, a. cordial, heartfelt, sincere; healthy, robust, hale; nourishing, nutritious. heat, n. warmth, caloric; cauma. Putnam's Word Book Consequently the sapwood of an old tree, and particularly of a forest-grown tree, will be freer from knots than the heartwood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The wood is light, soft, weak, brittle, and durable in the soil; the heartwood is dull orange-brown. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z Wood heavy, hard, strong, mostly light colored except in old heartwood, which is reddish. Studies of Trees The sapwood of pine, spruce, fir, cedar, cypress, and the like softwoods is especially liable to injury by ambrosia beetles, while the heartwood is sometimes ruined by a class of round-headed borers, known as "sawyers." Seasoning of Wood I think we want sapwood as well as heartwood to keep us green. We Girls: a Home Story It usually results from a shrinkage of the heartwood due probably to chemical changes in the wood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The reddish-brown heartwood, which suggests the name, red gum, is not present to any appreciable extent in logs under 16 inches in diameter. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z The heartwood is generally heavier and of deeper color than the sapwood. Studies of Trees In the sapwood of pine it occurs in all three forms; in the heartwood only in the second form, it merely saturates the walls. Seasoning of Wood In some cases, where both heartwood and sapwood appear, it is difficult to distinguish between them as their colors are so nearly alike. The School Book of Forestry There is an unfounded prejudice against the heartwood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Veneers of the heartwood are largely used in furniture, sometimes as imitation mahogany or Circassian walnut. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z The color of the heartwood is yellowish or russet brown; that of the distinct sapwood much lighter. Studies of Trees The wood itself contains very little true sap and the heartwood none. Seasoning of Wood The outside wood is white and the heartwood is red or yellow. The School Book of Forestry It is especially so of woods with deep-colored heartwood, and is due to infiltrations of tannins, oils, and resins, which make the wood more or less obnoxious to decay-producing fungi. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The wood is hard, dense, heavy, strong, the heartwood brown or black, the wide sapwood white or yellowish. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z Around the pith comes a dark, close-grained series of rings known as the heartwood, and outside the heartwood comes a lighter layer, the sapwood. Studies of Trees Sapwood, as a rule, shrinks more than heartwood of the same weight, but very heavy heartwood may shrink more than lighter sapwood. Seasoning of Wood This first layer finally develops into heartwood, which, so far as growth is concerned, is dead material. The School Book of Forestry Sometimes trees grown in the open may become of considerable size, a foot or more in diameter, before any heartwood begins to form, for example, in second-growth hickory, or field-grown white and loblolly pines. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing It is marketed under the name yellow poplar, because of the yellow color of the heartwood. Forest Trees of Illinois How to Know Them 2011-10-08T02:00:23.997Z It has a dark sweet-scented heartwood, like that of the Bricklow and the Myal and other Acacias, which I had previously met with. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 In white oak the vessels of the heartwood especially are closed, very generally by ingrowths called tyloses. Seasoning of Wood Because it takes up so much moisture and plant food, sapwood rots much more quickly than heartwood. The School Book of Forestry This is on the belief that sapwood is not only more subject to decay, but is also weaker than heartwood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Wood heavy, hard, extremely stiff and strong, of fine texture with a pale yellow sapwood, and an orange-red heartwood; seasons well and is quite durable. Seasoning of Wood The wood is rather soft and coarse in texture, the tree is of slow growth, and the brown colored heartwood, even of very young trees, forms nearly three-quarters of their volume. Seasoning of Wood It is really imperfect wood, while the duramen or heartwood is the perfect wood; the heartwood of the mature tree was the sapwood of its earlier years. Seasoning of Wood Sapwood light, heartwood darker brown, and is readily distinguishable from the sapwood, which very early turns into heartwood. Seasoning of Wood In species which show a distinct difference between heartwood and sapwood the natural color of heartwood is invariably darker than that of the sapwood, and very frequently the contrast is conspicuous. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Sapwood yellow, heartwood reddish brown, shrinks and checks considerably in drying, works well and stands well, and takes a fine polish. Seasoning of Wood The heartwood is a red or pinkish color, the sapwood, which is considerable, is a creamy white. Seasoning of Wood The duramen or heartwood is the inner, darker part of the log. Seasoning of Wood The broad sapwood whitish, heartwood light brown, both with shades of gray and red. Seasoning of Wood Shrinkage of the heartwood may be concentric as well as radial in its action, thus producing cup shake instead of, or in connection with, heart shake. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The distinction between the heartwood and sapwood of this species is marked. Seasoning of Wood Annual rings clearly marked, very durable in contact with the soil, shrinks and checks considerably in drying, the very narrow sapwood greenish yellow, the heartwood brown, with shades of red and green. Seasoning of Wood In the heartwood all the cells are lifeless cases, and serve only the mechanical function of keeping the tree from breaking under its own great weight or from being laid low by the winds. Seasoning of Wood The narrow sapwood yellow, the heartwood brownish red. Seasoning of Wood Specifications place white hickory, or sapwood, in a higher grade than red hickory, or heartwood, though there is no inherent difference in strength. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The sapwood whitish, heartwood yellow to orange brown, shrinks and checks considerably in drying, works well and stands well. Seasoning of Wood The sapwood whitish, the heartwood "oak" to reddish brown. Seasoning of Wood The same year's growth which is sapwood in one part of a disk may be heartwood in another. Seasoning of Wood Sapwood yellow, heartwood brown on the end face, yellow on the longitudinal faces, soon turning grayish brown if exposed. Seasoning of Wood Examination of the end of a log of many species reveals a darker-colored inner portion—the heartwood, surrounded by a lighter-colored zone—the sapwood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The broad sapwood cream color, the heartwood brown, sometimes almost black. Seasoning of Wood The narrow sapwood whitish, the heartwood dark, rich, chocolate brown, sometimes almost black; aged trees of fine quality bring fancy prices. Seasoning of Wood Sap- and heartwood distinct, the former lighter, the latter a dull grayish brown or red. Seasoning of Wood Work of Ambrosia Beetles in Oak. a, Monarthrum mali and work; b, Platypus compositus and work; c, bark; d, sapwood; e, heartwood; f, character of work in wood from injured log. Seasoning of Wood The sapwood of white oak may be impregnated with creosote with comparative ease, while the heartwood is practically impenetrable. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Sapwood dries faster than heartwood, and pine more rapidly than oak or other hardwoods. Seasoning of Wood With our native woods, for instance, summer-wood and spring-wood show distinct tendencies in drying, and the same is true in a less degree of heartwood, as contrasted with sapwood. Seasoning of Wood Thick, red heartwood, changing to reddish brown when seasoned. Seasoning of Wood The heartwood contained many knots and some checks, although it was in general of quite good quality. Seasoning of Wood It dries better and more easily than heartwood, usually with less shrinkage and little checking or honeycombing. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Nearly every knot in the heartwood was checked, showing that as the knots could be eliminated in any case, this loss might not be so great. Seasoning of Wood It was significant that practically all of the checking occurred in the heartwood. Seasoning of Wood The sapwood is yellowish white; the heartwood orange brown. Seasoning of Wood In heartwood it occurs only in the first and last forms. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing It is evident that there may be decided differences in the grain of heartwood and sapwood cut from a large tree, particularly one that is overmature. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing In ring-porous woods the vessels of the early wood not infrequently appear on a finished surface as darker than the denser late wood, though on cross sections of heartwood the reverse is commonly true. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Some, species begin to form heartwood very early in life, while in others the change comes slowly. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Resembles soft pine, is light, very soft, stiff, moderately strong, less resinous than pine; has no distinct heartwood, and is of whitish color. Seasoning of Wood In choosing the places on the block for the indentations, effort should be made to get a fair average of heartwood and sapwood, fine and coarse grain, early and late wood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing It is true that sapwood will not resist decay as long as heartwood, if both are untreated with preservatives. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing |
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