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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
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
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
The largest black spruce in Alaska | Geophysical Institute The Alaska champion black spruce tree stands on the campus of the University of Alaska Fairbanks The tree lives in a mixed forest next to large white spruce trees, mature birch and a few alders and willows The tree leans uphill, and its trunk is 45 inches around When I hugged it, I could barely clasp my hands together
Trees as Earthquake Fault Indicators | Geophysical Institute A swath of dead, tilted and broken trees now makes obvious the trace of the Fairweather fault that broke in July 1958 to devastate Lituya Bay and nearby parts of southeastern Alaska Sagging or tilting of the ground along a fault trace causes trees there to tilt or even fall
Pollen season arrives, blame the trees | Geophysical Institute The air is rich with pollen because spring is the mating season for trees The first step in a tree's reproductive dance is to release sperm, safely held in the center of a pollen grain Trees release an incredible amount of pollen to improve the odds of finding a female flower