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  • Cottonwood and Balsam Poplar | Geophysical Institute
    The Klukwan giant holds the national record for black cottonwood diameter Its nearest rival, a tree near Salem, Oregon, does hold the national height record 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
  • Northern Tree Habitats - Geophysical Institute
    Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch Northern Canadian forests have all of those, plus jack pine, balsam fir and lodgepole pine Since northern Canada and interior Alaska share the same grueling climate and extremes of daylength, why are the Canadian tree species absent from
  • 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 In good growing years, when sunlight and rainfall are plentiful, the growth rings
  • More on Why Tree Trunks Spiral | Geophysical Institute
    I eventually found a tree with a spiral lightning mark and it followed the spiral grain exactly One tree, of course, proves nothing "But why should the tree spiral? More speculation here: Foliage tends to be thicker on the south side of the tree because of better sunlight
  • Burls - Geophysical Institute
    Burls, spherical woody growths on the trunks of spruce, birch and other trees, are commonly found throughout wooded parts of Alaska
  • The secret life of red squirrels | Geophysical Institute
    Stan Boutin has climbed more than 5,000 spruce trees in the last 30 years He has often returned to the forest floor knowing if a ball of twigs and moss within the tree contained newborn red squirrel pups Over the years, those squirrels have taught Boutin and his colleagues many things, including an apparent ability to predict the future
  • Tropical Fossils in Alaska | Geophysical Institute
    A 20-inch fossil palm leaf that once waved over a tropical forest in Alaska 45-60 million years ago The fossil was found in rocks near the Malaspina Glacier Photo from the U S Geological Survey, Dept of the Interior
  • Bark Beetles in Spruce Trees | Geophysical Institute
    Bark beetles attack spruce trees in early summer These brownish black beetles are common throughout Alaska and Yukon Territory where they kill trees by boring through the bark and feeding and breeding in the phloem (inner bark)--the thin layer of soft tissue directly beneath the bark If the beetles girdle the phloem, the tree will die since the phloem is the vital path that transports food
  • 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
  • The varying colors of fall equinox | Geophysical Institute
    A very noticeable fall equinox feature in these parts is when deciduous tree leaves turn from green to yellow or orange or sometimes red, then fade and waft to the ground Middle Alaska doesn’t have many species of deciduous trees: paper birch, aspen, willows and balsam poplar are all part of the dominant boreal forest here





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