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trees    音标拼音: [tr'iz]

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  • Northern Tree Habitats - Geophysical Institute
    However, after seven growing seasons in Fairbanks, trees from the most northern homelands of the Dezadeash, Carmacks and Mayo areas of the Yukon are among the tallest, and the early starters from the south are now ranked at the bottom; although some of the trees from the Ft Nelson area of British Columbia have maintained their relatively fast
  • Burls - Geophysical Institute
    Trees with burls seem to be found in a cluster; if one tree in an area has burls, it is likely that other trees around it has them too This clumping is suggestive of leafhoppers or aphids transmitting the disease, but no conclusive evidence of this is known yet Burls weaken trees but do not kill them
  • Tropical Fossils in Alaska - Geophysical Institute
    In contrast, the equatorial and tropical rain forests may contain as many as 3000 different species in an area no larger than one square mile Trees of the rain forest tend to have smooth bark, broad evergreen leaves and heavily buttressed roots--all suitable characteristics for a climate where water and sunshine are plentiful all year round
  • More on Why Tree Trunks Spiral - Geophysical Institute
    Granted, not all trees exhibit the same twist, but the majority of them do The phenomenon can be likened to the claim that water will always spiral out of a drain in a counter-clockwise direction in the northern hemisphere It is well known that you can make it spiral out in either direction, if you give it a little shove first
  • Feltleaf willows: Alaska’s most abundant tree
    The range of the feltleaf willow, probably the most numerous tree in Alaska From Alaska Trees and Shrubs by Les Viereck and Elbert L Little, Jr
  • The largest black spruce in Alaska | Geophysical Institute
    The tallest trees are not always the winners of The Big Tree Challenge; foresters score trees on height, circumference and the spread of a tree’s crown The black spruce on the UAF campus is taller than the state record western paper birch, a 67-footer near Haines, and Alaska’s tallest balsam poplar, a 60-foot tree on the Kuskokwim River
  • Trees as Earthquake Fault Indicators - Geophysical Institute
    Trees along faults often are killed by drowning because the faults tend to collect normal drainage water In some instances, there are widespread tree kills caused by general subsidence Killed by sinking caused in the great 1964 Alaskan earthquake, firmly stark forests of dead trees stand guard around the shore of upper Turnagain Arm, near
  • Mummified forest tells tale of a changing north
    The mummy trees of northern Ellesmere Island include a trunk of a pine tree four feet long and six inches in diameter Each of the trees was at least 75 years old when it died The ancient forest holds samples of the last real trees in the area before it became too cold and dry to support large plants, Barker said
  • Pollen season arrives, blame the trees - Geophysical Institute
    Anderson found that birch trees begin releasing pollen about two days before leaves emerge from buds, and the concentration of birch pollen is greatest about three days after the leaves come out He measured more than 4,500 grains of birch pollen per cubic meter on the highest pollen days
  • Tamarack -- Not A Dead Spruce - Geophysical Institute
    Tamarack commonly grows on cold, wet sites and its growth rate and appearance do little to stimulate interest When one of these trees finds itself on a better site, however, it shows a remarkable change of pace Individual tamarack growing in white spruce stands may achieve a size comparable to white spruce 100 to 150 years old





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