| 单词 | annual ring |
| 例句 | Counting and examining the number of annual rings in trees would also point to the climactic changes over the years. Biology for AP Courses 2022-06-09T00:00:00Z In the same way that trees detail their growth in annual rings, so glaciers compact a record of the chemical composition of the air, trapped in bubbles in the yearly build-up of ice. Alpine ice sheds light on medieval murder 2020-03-31T04:00:00Z Trees in cold Arctic or alpine forests have annual rings with widths and wood densities that reflect year-to-year variations in summer temperature5. The aberrant global synchrony of present-day warming 2019-07-23T04:00:00Z But Pearson's team was able to measure the radiocarbon more precisely, in single, annual rings of three ancient bristlecone pines in California and two oak trees in Ireland. When did a massive volcano blow this island to bits and rock the ancient world? 2018-08-15T04:00:00Z Usual tree-ring dating methods are not suitable for baobabs, because their trunks do not necessarily grow annual rings. Africa’s majestic baobab trees are mysteriously dying 2018-06-11T04:00:00Z Scientists can predict the change in earth’s atmosphere by counting and analyzing the number of annual rings in trees. Biology for AP Courses 2022-06-09T00:00:00Z In the June issue of Scientific American Connie Woodhouse, associate professor in the School of Geography and Development at the University of Arizona, describes what the annual rings reveal. Ring around the Climate: Monsoon Rains Leave Lasting Traces in Trees [Video] 2013-06-08T14:15:00.140Z We already knew that some tropical tree species form annual rings and we also anticipated that the isotopic signature in these rings might record changes in the climate. Tree rings show Amazon's rainfall 2012-10-02T14:05:07Z The wood of the year in which this occurs may exhibit a double annual ring, and the vigour of the tree is likely to suffer in the following season and no fruit be matured. Disease in Plants 2012-03-01T03:00:22Z The converse has also been proved to be true—i.e., by increasing the pressure on the cambium by means of iron bands, the annual rings below the bands are thinner and denser than elsewhere. Scientific American Supplement, No. 648, June 2, 1888. 2011-12-26T03:00:15.410Z In woody plants, especially trees, annual rings may form as growth slows at the end of each season. Biology for AP Courses 2022-06-09T00:00:00Z The annual rings in a root are often less clearly marked than in the stem, and the xylem-elements are frequently larger and thinner. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z Some of these trees are ten feet in diameter, and have from five to six thousand annual rings of growth. Nature and Culture 2011-11-17T03:00:34.107Z The accumulation of these worn-out cells forms the total of the season's growth, the annual ring of wood on one side of the cambium and the annual layer of bark on the other. Trees Worth Knowing 2011-10-13T02:00:48.357Z Appearance of Wood: Color, dark orange, sapwood lighter; non-porous; annual rings, plain, sharp contrast between spring wood and summer wood; grain, straight; rays numerous, rather prominent; very resinous, but ducts few. Wood and Forest 2011-03-01T03:00:42.647Z Excess cork will be produced and annual rings will not be formed. Biology for AP Courses 2022-06-09T00:00:00Z Our Big Trees show, by an examination of their annual rings, the same story that the rocks tell,—and that history tells,—that there have been constant fluctuations of climate, within certain limitations. Unexplored! The coniferous trees of the coal measures show annual rings of growth. The Origin of the World According to Revelation and Science Many annual rings lie between it and the cambium. Trees Worth Knowing 2011-10-13T02:00:48.357Z Transition from spring wood to summer wood gradual; annual ring distinguished by a fine line of dense summer-wood cells; color, white to yellowish red; wood soft and light. Wood and Forest 2011-03-01T03:00:42.647Z Besides the age of a tree, what additional information can annual rings reveal? Biology for AP Courses 2022-06-09T00:00:00Z By chopping through the log at that point and making a rough count of the annual rings of growth, they estimated that all this had happened forty years ago. Unexplored! The annual rings of the trunk that have overgrown the dead sapling tell the year of the storm. My First Summer in the Sierra Each annual ring in the chestnut stump is distinct from its neighboring ring. Trees Worth Knowing 2011-10-13T02:00:48.357Z "Diffuse-porous" Woods. ar, annual ring; pr, pith rays which are "broad" at a, "fine" at b, "indistinct" at d. Wood and Forest 2011-03-01T03:00:42.647Z The annual rings are so close together that they can not be distinguished without a magnifying glass. The Forests of Mount Rainier National Park Others have grown so slowly that only with a microscope can the annual rings be counted. Old Plymouth Trails Sorry I was not able to get a count of the old monument's annual rings. My First Summer in the Sierra Wide annual rings with large pores mark coarse-grained woods. Trees Worth Knowing 2011-10-13T02:00:48.357Z Stem furrowed, and therefore the periphery of section, and with it the annual rings sinuous, bending in and out, and the large pith rays generally limited to the furrows or concave portions. Wood and Forest 2011-03-01T03:00:42.647Z Individuals more than 500 years old are not uncommon and there is a well-authenticated instance where the annual rings indicated a growth of more than 1,100 years. The Forests of Mount Rainier National Park One, that had been broken off by a rock slide, had two hundred and ninety-six annual rings. A Mountain Boyhood It showed six hundred and seventy-nine annual rings. Wild Life on the Rockies The annual rings of the wood, which are quite as small as in a slow-growing Baltic pine, are distinctly visible in all the better pieces I this day transferred to my bag. The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland It may also, but more rarely, be confounded with heavier white pine, but for the sharper definition of the annual ring, weight, and hardness. Wood and Forest 2011-03-01T03:00:42.647Z The number of annual rings on trees 15 to 20 inches in diameter indicate that they are over 200 years old. The Forests of Mount Rainier National Park Wood soft and with little resin, of uniform color and with relatively obscure definition of the annual rings. The Genus Pinus Wood close-grained, compact structure, annual rings clearly marked. Seasoning of Wood So perfect are these petrifactions that the annual rings can be easily counted and even the grain of the wood is plainly visible. Wealth of the World's Waste Places and Oceania Their wood grows rapidly in concentric annual rings, like that of the broad-leaved trees; is easily worked, and is more widely used than the wood of any other class of trees. Wood and Forest 2011-03-01T03:00:42.647Z Yellow pine flooring that is rift-sawn is more valuable than slash-sawn, because the edge of the annual rings makes a more even grain, Fig. Handwork in Wood Wood hard, with dark resinous bands, the annual rings clearly defined. The Genus Pinus In common usage, wood is coarse-grained if its annual rings are wide; fine-grained if they are narrow. Seasoning of Wood A cross-section of the trunk of a dead tree, as large as any of those living, shows about fifty annual rings. Handbook of the Trees of New England Even where there is radial growth, as in yucca, the structure is not in annual rings, but irregular. Wood and Forest 2011-03-01T03:00:42.647Z They warp less because the annual rings cross the board more evenly. Handwork in Wood Several layers of wood could be counted underneath these callused margins—often 6 or 7—before reaching the annual ring exposed at the surface of the canker. Northern Nut Growers Association, Report Of The Proceedings At The Tenth Annual Meeting. Battle Creek, Michigan, December 9 and 10, 1919 Heartwood light brown in color, sapwood nearly white, coarse conspicuous grain, compact structure, annual rings pronounced. Seasoning of Wood The latter are very small, numerous, and appear as irregular grayish bands widening toward the outer edge of the annual ring. Studies of Trees Instead of having concentric annual rings and thus growing larger year by year, the woody tissue grows here and there thru the stem, but mostly crowded together toward the outer surfaces. Wood and Forest 2011-03-01T03:00:42.647Z A Drawing-Board is made up of narrow boards, with glued joints, with the boards so laid that the annual rings will alternate in direction, Fig. Handwork in Wood The width of the spring wood changes but little with the width of the annual ring, so that the narrowing or broadening of the annual ring is always at the expense of the summer wood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Heartwood of a light brown color with lighter sapwood, has a fine, slightly satiny grain, and is fairly free from knots; the annual rings are distant. Seasoning of Wood You can illustrate the annual rings and count the age of the tree. Studies of Trees Notice the width of the annual rings in later age compared with early. Wood and Forest 2011-03-01T03:00:42.647Z For this purpose the boards are so laid that the annual rings of one shall alternate in direction with the annual rings of the next, Fig. Handwork in Wood There is no definite relation between the annual rings of growth and the amount of sapwood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Heartwood orange, sapwood lighter color, the annual rings are strongly marked, and it is full of resinous matter, making it very durable, but difficult to work. Seasoning of Wood These two portions, known as early wood or spring wood, and late wood or summer wood, together make up one year’s growth and are for that reason called annual rings. Studies of Trees If a section of a single annual ring of green wood of the shape A B C D, in Fig. Wood and Forest 2011-03-01T03:00:42.647Z Cutting it half through and counting the annual rings with the aid of a lens, I found its age to be no less than 255 years. The Yosemite The time of cutting can have no material effect on the inherent strength and other mechanical properties of wood except in the outermost annual ring of growth. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Heartwood light red or yellow in color, sapwood narrow, nearly white, comparatively free from resins, variable annual rings. Seasoning of Wood It was felled to procure a section for exhibition, and thus an opportunity was given to count its annual rings of growth. The Mountains of California It had 52 annual rings and 50 or possibly 52 whorls of branches. The Arctic Prairies : a Canoe-Journey of 2,000 Miles in Search of the Caribou; Being the Account of a Voyage to the Region North of Aylemer Lake Wood coarse-grained, well-marked annual rings, medullary rays few but broad. Seasoning of Wood Under ordinary conditions one layer is formed each year and in cross section as on the end of a log they appear as rings—often spoken of as annual rings. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The annual rings are very distinct, medullary rays very minute and not visible to the naked eye. Seasoning of Wood Cutting it half through and counting the annual rings with the aid of a lens, we find its age to be no less than 255 years. The Mountains of California The cells of certain species of wood appear to lack cohesion, especially at the junction between the annual rings. Seasoning of Wood The annual rings of growth are for many years quite wide, but later they become narrower and narrower. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing With the exception of this one annual ring, or portion of one, the density of the wood substance of the sapwood is nearly the same the year round. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The annual rings are not distinctly marked, medullary rays fine and numerous. Seasoning of Wood Only in a tangential direction, or around the stick in direction of the annual rings of growth, do the two forces coincide. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing |
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