2025年1月23日 · Poplar leaves are larger--2-1/2 to 4-1/2 inches long--and broadly lance-shaped, shiny dark green above and pale green to brownish below. The cottonwood leaf is very similar to the poplar. If you see a cottonwood tree in interior Alaska, you can be sure it's a balsam poplar, but in southern Alaska it could be either.

2025年1月23日 · 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.

2017年11月16日 · Signs of the American beaver in Alaska: A cut poplar tree on the upper Tanana River and a dam on Phelan Creek near Isabel Pass in the Alaska Range. Ned Rozell photos. Beavers slapping tails on far-north waters

2025年1月23日 · 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 shoot growth. Also, if one wishes to identify the variety of a tree by its leaves, one should be sure to gather leaves from the old growth.

2025年1月23日 · The tallest trees are not always the winners of The Big Tree Challenge; foresters score trees on height, circumference and the spread of a tree’s crown. The black spruce on the UAF campus is taller than the state record western paper birch, a 67-footer near Haines, and Alaska’s tallest balsam poplar, a 60-foot tree on the Kuskokwim River.

2021年6月18日 · The two-acre exotic tree plantation is part of a much-larger “boreal arboretum” on the UAF campus, which mostly consists of native spruce, birch, aspen, poplar and willow trees. Having borrowed the key from a researcher with UAF’s Agricultural and Forestry Experiment Station, Woodward has invited me to join him inside the chain-link fence.

2023年12月7日 · She gestured to a tree that — somewhat unusual for a birch here — has branches that extend straight outward from the trunk. “I kind of felt like I was walking into a hug.” That sentence hit this observer right in the heart. She pointed out that the birch tree representing her father stands between trees chosen for Moore and Germann.

1999年5月5日 · The first step in a tree's reproductive dance is to release sperm, held in the center of a pollen grain. Trees release an incredible amount of pollen to improve the odds of finding a female flower. One birch catkin (the cluster of tiny flowers that looks like a caterpillar) can release millions of pollen grains.

2006年9月20日 · Tamarack, a tree often mistaken for sickly spruce because of its spindly branches, provides 24.8 million Btu per cord, followed by black and white spruce at about 20.5 million Btu, aspen at 18.8 million Btu, and balsam poplar at 17.5 million Btu. Sampson's measurements are for air-dry wood with a 20 percent moisture content.

2012年3月1日 · The red flat bark beetle lives as far north as there are balsam poplar trees in Alaska, hunkering down for the winter in the moist area between dead bark and tree. Scientists like Todd Sformo have found most of them in the larval stage, where they resemble segmented worms a bit longer than a grain of rice.