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Pinus albicaulis is the only type of tree on the summit of Pywiack Dome in Yosemite National Park. Pinus albicaulis, known by the common names whitebark pine, white bark pine, white pine, pitch pine, scrub pine, and creeping pine, [4] is a conifer tree native to the mountains of the western United States and Canada, specifically subalpine areas of the Sierra Nevada, Cascade Range, Pacific ...
Viable seeds produced by a mature tree undergo Stratification. [2] This process imitates the period of dormancy that occurs during the winter. [2] In the commercial Christmas Tree nurseries of the northern United States, seeds are sown directly into seed beds in the late fall to allow the seeds to stratify naturally over the winter.
The seed cones are slender, 8–16 cm (3 + 1 ⁄ 4 – 6 + 1 ⁄ 4 in) long (rarely longer than that) and 4–5 cm (1 + 1 ⁄ 2 –2 in) broad when open, and have scales with a rounded apex and slightly reflexed tip, often resinous.
Kittredge and Gervorkiantz (1929) [133] determined that removal of the aspen forest floor increased germination percentage after the second season in seed spots of both white pine and white spruce, in four plots, from 2.5% to 5%, from 8% to 22%, from 1% to 9.5%, and from 0% to 15%.
The Sierra Nevada subalpine zone occurs between 2,450–3,660 metres (8,000–12,000 ft), and is characterized by an open woodland of several conifer species, including whitebark pine, lodgepole pine, western white pine, mountain hemlock, and Sierra juniper. The vegetation and ecology is determined by the harsh climate, with extensive snow and ...
The effects of carbon dioxide enrichment and nitrogen supply on the growth of white spruce and trembling aspen were investigated by Brown and Higginbotham (1986). [5] Seedlings were grown in controlled environments with ambient or enriched atmospheric CO 2 (350 or 750 f 1/L, respectively) and with nutrient solutions with high, medium, and low N ...
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Pinus aristata has seeds that are gray-brown to nearly black in color with darker spots and 5–6 mm long. The seed has an attached papery wing 10–13 mm long. [5] [7] Their mean weight is 25 milligrams, significantly smaller than those of the whitebark pine at 175 mg, but much larger than the 4 mg of lodgepole pine. [10]