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Northern Tree Habitats - Geophysical Institute They examined the present range of lodgepole pine and decided that the tree could survive in interior Alaska if given a chance Lodgepole pine grows from southern California to the Yukon, in environments varying from rainy seacoasts to dry inland mountaintops, because genetically different strains have developed
More on Why Tree Trunks Spiral - Geophysical Institute Prevailing winds, in most of the tree-growing northern hemisphere, are from the west Combine these factors, and the westerly wind pushing on the thicker south side of the tree, year after year, causes an asymmetrical wind loading which slowly twists the tree around in the observed direction
Trees as Earthquake Fault Indicators - Geophysical Institute Then using tree ring dating methods, it may be possible to date earthquakes occurring before historical records were kept The ability to identify and date very large earthquakes occurring within the past thousand years is important in establishing earthquake risk and for predicting future earthquakes
Tree Rings and History - Geophysical Institute A tree's age can be easily determined by counting its growth rings, as any Boy or Girl Scout knows Annually, the tree adds new layers of wood which thicken during the growing season and thin during the winter These annual growth rings are easily discernible (and countable) in cross-sections of the tree's trunk
Witches Broom - Geophysical Institute Witches' broom on spruce trees is caused by a rust disease (a kind of fungus disease) The rust lives on the spruce tree throughout the year Each spring, small yellow pustules appear on the new needles of the broom A strong sweet odor, which is easily recognizable, usually accompanies the maturation of these pustules
The largest black spruce in Alaska | Geophysical Institute The tree leans uphill, and its trunk is 45 inches around When I hugged it, I could barely clasp my hands together The largest black spruce in Alaska is a lucky tree, because its neighbors to the north are gone, removed in the mid-1990s during the installation of a power line
Trees for a Cold Climate - Geophysical Institute Back on the ground, I did a little research on why so few tree types grow naturally in the neighborhood Winter's extreme cold easily eliminates some tree species hardy elsewhere Oak, ash, and elm endure occasional severely cold temperatures in the contiguous forty-eight states because they can produce chemicals that serve as natural antifreeze
Burls - Geophysical Institute Since the hardness of the wood is related to the rate of growth, the wood inside a rapidly growing burl is softer than the wood elsewhere in the tree Nevertheless, it is hard enough to be sanded and finished into an attractive surface An affected tree may grow a single burl or many; trees with multiple burls on both trunk and limbs have been
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
The Life of A White Spruce In The Subarctic - Geophysical Institute This majestic tree is one of the most commercially important species in the Interior, it is valued for the houselogs, firewood, and other products that are derived from it In fact, it has been and still is the most important tree in the subsistence life of the Alaska Athabascans, who use all parts of the tree including the roots and resin