Ecological Effects of Forest Fires in the Interior of Alaska, Ausgabe 1133U.S. Government Printing Office, 1956 - 121 Seiten |
Häufige Begriffe und Wortgruppen
abundant Alaska interior Alaska paper birch Alaska Range aphthosa arctica aspen stands balsam poplar Basal area Bebb willow birch stands black spruce Calamagrostis canadensis canadensis caribou climax common density of cover destruction EFFECT OF FIRE favorable feet following fires FORBS forest fires forest floor gracilis growth Hedw increased interior Alaska interior of Alaska Kenai paper birch Kenai Peninsula layers Littletree willow Lynge 84 Mertensia paniculata mineral soil moose mosses OCCASIONAL TO RARE occur organic matter palustre ssp paper birch Peltigera percent plants plots Pyrola Pyrola asarifolia quaking aspen regeneration region reported reproduction result root suckers Rosa acicularis Sarvas Scouler willow seedlings severe fires SHRUBS Sitka alder species spruce seed spruce stands spruce trees stand age Tanana temperatures timber Trees per acre U. S. Dept U. S. Geol upland usually Vaccinium Vaccinium vitis-idaea Vainio vegetation white spruce white spruce-paper birch wildlife willow young stands Yukon
Beliebte Passagen
Seite 64 - From this lake he entered a river flowing northward, which received from him, and which still retains, his own name of Mackenzie. "The current," he remarks, "is very strong, and the " banks are covered with large quantities of burned wood, " lying on the ground, and young poplar trees that have " sprung up since the fire that destroyed the larger wood. " It is a very curious and extraordinary circumstance " that land covered with spruce pine and white birch, " when laid waste by fire, should subsequently...
Seite 97 - Reconnaissances in the Cape Nome and Norton Bay Regions, Alaska, in 1900. By Alfred H. Brooks, George B. Richardson, Arthur J. Collier, and Walter C.
Seite 1 - ... made their records available. The study was made by the Range and Ranch Management Investigations Group of the Farm Economics Division, Economic Research Service, US Department of Agriculture; and agricultural economists of Montana State College, Utah State University, and Arizona State University, the Forest Service, US Department of Agriculture, and the Bureau of Land Management of the US Department of the Interior.
Seite 95 - REPORT OF A SUPPLEMENTARY EXPEDITION INTO THE COPPER RIVER VALLEY, ALASKA, 1884.
Seite 11 - ... over wide spaces, such as lakes and rivers, and starting the fire afresh in advance of the main column, as if impatient of the slower progress it is making. These immense shooting flames are probably due to the large quantities of highly inflammable gas evolved by the heat from the pitchy tree-tops just in advance of actual combustion, and they help to account for the incredible speed of most of the larger forest fires. The wild animals appear to understand the significance of the roaring noise...
Seite 3 - A rolling upland about 200 miles wide, deeply dissected by well-developed drainage systems, with stream valleys and broad lowlands, and diversified by scattered mountain masses and isolated peaks that rise above the general level...
Seite 90 - ... potentially commercial. Some 80 million acres of the interior bear sparse forests of open woodland. Sample plots indicate that at a rotation age of around 160 years white spruce stands may average about 15,500 board-feet or 3,900 cubic feet per acre. Indications are that at 160 years of age, 80 percent of the trees would be 5 inches in diameter and larger and that 20 percent would exceed 12 inches in diameter; some of the trees would then be 18 to 20 inches. On the 40 million acres of commercial...
Seite 11 - Great sheets of flame disconnect themselves from the fiery avalanche and leap upwards as towering tongues of fire, or dart forward, bridging over wide spaces, such as lakes and rivers, and starting the fire afresh in advance of the main column, as if impatient of the slower progress it is making.
Seite 6 - River regions. It is noteworthy that considerable areas of forest occur north of the Arctic Circle, as along the Porcupine and its tributaries, the Chandalar, the upper Koyukuk, and the Kobuk Rivers. Trees grow north of latitude 68° N. on the south slopes of the Brooks Range and as far west as the...
Seite 10 - When the fire has once started, the pitchy trees burn rapidly ; the flames rush through their tops and high above them with a roaring noise. Should the atmosphere be calm, the ascending heat soon causes the air to flow in, and after a time the wind acquires great velocity. An irresistible front of flame is soon developed, and it sweeps forward, devouring the forest before it like the dry grass in a running prairie fire, which this resembles, but on a gigantic scale.