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  • Skinny Trees and Paleoforests - Geophysical Institute
    Growth rings in fossilized trees establish the presence of changing seasons, including warm summers, in high latitudes However, a tree growing in the long-gone warm Arctic wouldn't look like a tree growing in the ancient temperate zone Even then, a high-latitude tree would probably be skinny, like the pipecleaner spruce of Alaska's interior
  • Raven roosts shrouded in mystery | Geophysical Institute
    I imagined a group of trees decorated with black ornaments Scientists in Fairbanks, in Anchorage and outside Alaska have studied raven roosts They have wondered why the birds gather together at night, sometimes in urban areas and other times in wild ones far from people
  • Tropical Fossils in Alaska | Geophysical Institute
    Paleobotanist Jack A Wolfe of the United States Geological Survey at Menlo Park, California, has found a number of tropical rain forest fossils along the eastern Gulf of Alaska These include several kinds of palms, Burmese lacquer trees, mangroves and trees of the type that now produce nutmeg and Macassar oil
  • 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
  • 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
  • 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
  • Elephant Point and trees growing on ice | Geophysical Institute
    Geophysical Institute glaciologist Martin Truffer has photographed trees growing well in the thin soil layer atop Bering, Malaspina and other glaciers in southern Alaska When a glacier shrinks to the point where it stops moving and squats in place, soils build up and tree seeds waft in on the breeze If conditions are right, forests grow on ice
  • Pine grove near Yakutat is farthest north | Geophysical Institute
    The trees’ tint was a bit darker than the needles of hemlock and Sitka spruce to which the eye grows accustomed around this Southeast Alaska town The bottle-brush branches of the pines curved upward, like fingers on a hand poised to catch a ball
  • Feltleaf willows: Alaska’s most abundant tree | Geophysical Institute
    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
  • 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





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