Cottonwood and Balsam Poplar - Geophysical Institute
6 天之前 · While poplar may grow to 100 feet high and two feet across, cottonwood can reach to 125 feet and be much larger in diameter. Cottonwoods three feet in diameter at breast height …
Burls - Geophysical Institute
2024年11月22日 · Since the hardness of the wood is related to the rate of growth, the wood inside a rapidly growing burl is softer than the wood elsewhere in the tree. Nevertheless, it is hard …
The majesty and mystery of Alaska yellow cedar
2021年7月23日 · Probably because of chemical compounds within the tree like nootkatin that emit the pleasant odor and tint the wood yellow, Alaska yellow cedar endures like no other tree in …
Tree Rings and History - Geophysical Institute
2024年10月3日 · 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 …
More on Why Tree Trunks Spiral - Geophysical Institute
6 天之前 · 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. …
Visit to an exotic tree plantation in Alaska
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 …
Mummified forest tells tale of a changing north
2011年1月6日 · The mummy trees of northern Ellesmere Island include a trunk of a pine tree four feet long and six inches in diameter. Each of the trees was at least 75 years old when it died. …
Northern Tree Habitats - Geophysical Institute
6 天之前 · They examined the present range of lodgepole pine and decided that the tree could survive in interior Alaska if given a chance. Lodgepole pine grows from southern California to …
Witches' Broom - Geophysical Institute
6 天之前 · Witches' broom on spruce trees is caused by a rust disease (a kind of fungus disease). The rust lives on the spruce tree throughout the year. Each spring, small yellow pustules …
The Turkey and the Tambalacoque Tree - Geophysical Institute
1990年11月14日 · The problem was the decline of the tambalacoque tree, a once common and useful source of timber for the island residents. Only thirteen of the trees remained, and they …