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      Northern Tree Habitats - Geophysical Institute

      4 days ago · 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.

      Leaves - Geophysical Institute

      Jan 23, 2025 · Trees with indeterminate growth continue to grow until late July or early August. In this late part of summer the leaves not found in the indeterminate shoot bud finally form. Obviously there is a greater chance of wide variation in the leaves growing from those trees and shrubs such as poplar and highbush cranberry that have indeterminate ...

      Leaves or Needles, Trees or Tundra | Geophysical Institute

      Feb 13, 2025 · Where the trees had recolonized burned but once forested areas, birch and cottonwood were resisting the return of black spruce and white spruce both. The conifers were less common than in unburned sites, while the resident deciduous trees--balsam, poplar and paper birch--were more common.

      Alaska beetles survive 'unearthly' temperatures

      Mar 1, 2012 · The larger beetle Upis ceramboides, which has no common name, survives the winter in dry crevices in trees. Unlike the flat bark beetle, the Upis beetle tolerates freezing rather than avoiding it. Sformo found that the Upis beetles froze at about minus 7.5 C (18.5 F) in the lab and survived temperatures down to about minus 76 C (minus 104 F).

      The galloping glacier’s recent dramas - Geophysical Institute

      Aug 22, 2024 · Later in the day, we visit a grove of spruce and poplar trees a few miles north of Black Rapids Lodge. Here, 30 years before George Washington was born, a wall of water left a giant iceberg behind. What remains is a massive crater in which trees now grow. The hole from the long-gone iceberg is still 30 feet deep.

      Do Trees Communicate for Mutual Defense? - Geophysical Institute

      Feb 6, 2025 · Do Trees Communicate for Mutual Defense? Do Trees Communicate for Mutual Defense? March 31, 1986 ...

      The Coldest Place in North America - Geophysical Institute

      Jan 23, 2003 · We found a ghost town. The airfield that provided a home in 1947 to Blezard and three other meteorologists, several aircraft mechanics, and a few radio operators now features one shell of a log-sided building and an airstrip overgrown with balsam poplar trees.

      Alaska hot springs, far and wide | Geophysical Institute

      Feb 22, 2024 · The trees surrounding the Kanuti clearing are typical of the boreal forest, but Pilgrim Springs on the Seward Peninsula is home to spruce and pine trees, planted by someone during that place’s long occupation. Balsam poplar trees also grow there. Pilgrim Springs was home to a pair of nesting great horned owls when I once visited.

      World traveler visits South Fairbanks - Geophysical Institute

      As we broke into a stand of balsam poplar trees, we heard a slightly metallic song. “Oooh, blackpoll warbler,” Kristen said. Blackpoll warblers are a bird you would expect to hear in South Fairbanks. But this one grabbed my attention because it sang from a tree very close to me. I found him in the binoculars and established a personal ...

      Pollen season arrives, blame the trees - Geophysical Institute

      Feb 6, 2025 · By taking the average of the daily high and low temperatures and subtracting 32 degrees Fahrenheit, he came up with a number called degree-days. By looking at past years' pollen outbreaks and comparing them with temperature records, he found that, in the Fairbanks area, poplar and aspen release pollen first.