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Northern Tree Habitats | Geophysical Institute Why take a chance with exotics, when native trees have proven their ability to survive? Several reasons prompt testing of foreign tree species Human activities often create and maintain new, sometimes artificial habitats that native trees are not adapted to Exotics may have strong wood, large fruits or straight boles that are lacking in the
Cottonwood and Balsam Poplar | Geophysical Institute The Klukwan giant belies the belief that trees tend to get smaller the farther north one goes Both balsam poplar and cottonwood have value for fuel wood, pulp and lumber
Tree line changes on the Kenai Peninsula - Geophysical Institute Tree line didn’t change much on south-facing slopes, but trees and bushes got denser there Katrina Timm and Alissa McMahon compared photos of the western Kenai hills from the 1950s to photos of the same area taken in 1996 to see the changes in tree line, which is among the most gradual and spotty indicators of warming
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
Burls - Geophysical Institute Burls weaken trees but do not kill them The weakening effect, however, makes the trees vulnerable to other diseases which can kill them Relatively little is known about burls, for several reasons: It takes a long time for a burl to grow--nearly as long as the tree on which it is found--so research is stretched out over a long period of time
The Kodiak Treeline | Geophysical Institute Spruce trees planted on the islands by the Russians in 1805 are doing just fine and reseeding themselves naturally, although the total tree population hardly amounts to a forest
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
Hoarfrost Formation | Geophysical Institute By late winter, intricate buildups of hoarfrost crystals have formed on wooden poles and other objects Warming rays of the sun cause evaporation of whatever frost may have formed on the south side of vertical poles and trees Conduction within metal poles causes enough heat transfer to entirely remove the hoarfrost crystals from the pole surface
The Life of A White Spruce In The Subarctic - Geophysical Institute It was found that, over the course of a year, trees at both locations produced the same amount of wood, but that Alaska trees produced the wood in one-half the time required by those in Massachusetts In other words, subarctic trees are able to take advantage of Alaska's growing season by completing growth quickly during the long summer days