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Author: Willem W. S. Van Hees Publisher: ISBN: Category : Sitka spruce Languages : en Pages : 24
Book Description
During the past 30 years, spruce forests of Alaskas Kenai Peninsula have undergone dramatic changes resulting from widespread spruce bark beetle(Dendroctonus rufipennis (Kirby)) infestation. In 1987 and again in 2000, the Pacific Northwest Research Stations Forest Inventory and Analysis Program conducted initial and remeasurement inventories to assess broad-scale impacts of this infestation. Changes in regeneration of Sitka spruce(Picea sitchensis (Bong.) Carr.) and white spruce (Picea glauca (Moench) Voss) are examined by using data collected on 130 plots. Regeneration of Sitka and white spruce in terms of mean number of seedlings per plot is not significantly different from the 1987 findings. The number of plots where seedling stocking remained at previous levels or increased, slightly exceeded the number of locations where seedling stocking declined. Almost half the plots (49 percent) had decreased numbers of seedlings, and almost 72 percent of the plots fell in the less-than-fully-stocked category in both inventories. Also, the distribution of the seedlings over the plot was not uniform. No plots had seedlings on all plot cluster sample points in either inventory.
Author: Willem W. S. Van Hees Publisher: ISBN: Category : Sitka spruce Languages : en Pages : 24
Book Description
During the past 30 years, spruce forests of Alaskas Kenai Peninsula have undergone dramatic changes resulting from widespread spruce bark beetle(Dendroctonus rufipennis (Kirby)) infestation. In 1987 and again in 2000, the Pacific Northwest Research Stations Forest Inventory and Analysis Program conducted initial and remeasurement inventories to assess broad-scale impacts of this infestation. Changes in regeneration of Sitka spruce(Picea sitchensis (Bong.) Carr.) and white spruce (Picea glauca (Moench) Voss) are examined by using data collected on 130 plots. Regeneration of Sitka and white spruce in terms of mean number of seedlings per plot is not significantly different from the 1987 findings. The number of plots where seedling stocking remained at previous levels or increased, slightly exceeded the number of locations where seedling stocking declined. Almost half the plots (49 percent) had decreased numbers of seedlings, and almost 72 percent of the plots fell in the less-than-fully-stocked category in both inventories. Also, the distribution of the seedlings over the plot was not uniform. No plots had seedlings on all plot cluster sample points in either inventory.
Author: Barry Leonard Publisher: DIANE Publishing ISBN: 9781422399989 Category : Technology & Engineering Languages : en Pages : 78
Book Description
Contents: Pacific Northwest (PNW) Research Station: The Setting: A Message from the PNW Executive Team; Goal Accomplishments; Goal 1: Develop an Understanding of Ecological, Social, & Economic Systems & Their Interactions; Goal 2: Assess the Status & Trends of Ecosystems & Natural Resources & Their Uses; Goal 3: Develop Science-Based Options for Informed Mgmt.; Goal 4: Communicate Science Findings & Enhance their Applications; Publications; symposia, Workshops, & Tours; Conservation Education; Honors & Awards; Research Context; Finances & Workforce; Cooperators Who Received Funding for Studies; Clients Who Provided Funding for Studies; & PNW Research Station Org. Illustrations.
Author: Sally J. Campbell Publisher: ISBN: Category : Forest surveys Languages : en Pages : 36
Book Description
This publication presents highlights of a recent south-central Alaska inventory conducted by the Pacific Northwest Research Station Forest Inventory and Analysis Program (USDA Forest Service). South-central Alaska has about 18.5 million acres, of which one-fifth (4 million acres) is forested. Species diversity is greatest in closed and open Sitka spruce forests, spruce woodlands, closed tall alder shrub type, and low shrub willow type. Of the forest land, 1.9 million acres are classified as timberland (unreserved productive forest land). About 1.3 million acres of forest land are reserved from harvest; these reserved forest acres are primarily on the Kenai National Wildlife Refuge, national parks, and the Chugach National Forest. The volume of timber on timberland was estimated at 5,087 million cubic feet; the plurality of volume44 percentis on state and local government lands with the remaining volume primarily on private lands (28 percent) and national forests (23 percent). Fifty-seven percent of timberland acres and 93 percent of the growing-stock volume is in sawtimber stands, with Sitka spruce forest type predominating. Most timberland in south-central Alaska is of relatively low productivity, producing less than 50 cubic feet per acre per year. For timberland acres on state and private lands, average annual mortality and harvest exceeded average annual growth.
Author: Willem W. S. Van Hees
Author: Willem W. S. Van Hees
Author: Willem W. S. van Hees
Author: Willem W. S. van Hees
Author: 
Author: Barry Leonard
Author: 
Author: Sally J. Campbell
Author: Susan E. Quinlan
Author: M. G. Weber
Author: Michael G. Weber