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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
Witches Broom | Geophysical Institute In interior Alaska and some parts of Canada, witches' broom (an abnormal outgrowth of branches of the tree resembling the sweeping end of a broom), is commonly seen on black and white spruce trees From late fall through the winter, the brooms are dark brown or "dead"looking and are often mistaken for birds' and squirrels' nests
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
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 In good growing years, when sunlight and rainfall are plentiful, the growth rings
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
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
Alders go their own way in autumn - Geophysical Institute But one shrubby tree does not join the party Alders remain a stubborn green Many won't drop their leaves until long after the snow falls This reluctance is one of the wonders of an overlooked organism, said ecologist Roger Ruess A UAF professor, Ruess has studied alders on Alaska floodplains and within upland forests for the past quarter
Tamarack -- Not A Dead Spruce | Geophysical Institute It is not possible to foretell if tamarack may some day become a commercial crop, but one thing is certain: the "spruce that dies" each fall has some unique qualities that make it a desirable tree for ornamental, subsistence and commercial uses in interior Alaska
Rock redwoods in Sutton, stone bird tracks in Denali The twin stems of a 55-million year old fossil tree resting in the soil near Sutton, Alaska Photo by Chris Williams Tracks of a large, crane-like bird that walked in the Denali National Park area about 70 million years ago Figure courtesy of Tony Fiorillo The twin stems of a 55-million year old fossil tree resting in the soil near Sutton