Proceedings of the National Silviculture Workshop; Silvicultural Challenges and Opportunities in the 1990's Petersburg, Alaska, July 10-13, 1989

Proceedings of the National Silviculture Workshop; Silvicultural Challenges and Opportunities in the 1990's Petersburg, Alaska, July 10-13, 1989

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1989* edition. Excerpt: ...juniper (Pseudotsuga menziesii/Arctostaphylos adenotricha-Juniperus communis) plant association (Johnston, 1987). Soils are predominantly sandy loams. Average site index is 60/100 (Alexander). Although most stands on drier sites are typed as ponderosa pine, Douglas-fir is a substantial stand component and is the major tree species in the understory. In the early 1980's, a mountain pine beetle (Dendroctonus ponderosae) infestation occurred in the vicinity of Russell Ridge. The Interdisciplinary Team responsible for sale design recognized the need to improve forest health to meet visual quality and other objectives over time. The primary silvicultural goal was to reduce susceptibility to mountain pine beetle, spruce budworm and wildfire. Silvicultural prescriptions included twostep shelterwood and commercial thinning to improve stand vigor. Ponderosa pine was the favored species in both prescriptions. The shelterwood prescription specified prescribed fire to accomplish site preparation for natural regeneration. The primary objectives of the underburn were three-fold: 1) prepare seedbed favorable for establishment of ponderosa pine regeneration; 2) reduce competition from established Douglas-fir regeneration; and 3) reduce fire hazard, particularly near private land. The prescriptions also specified commercial thinnings at ages 50 and 70 to maintain stand vigor. The selected density management regime for stands prescribed for commercial thinning would maintain stands in the low risk category for mountain pine beetle (Stevens, et al, 1980). The Rocky Mountain Growth and Yield Model (RMYLD) was used to analyze density management regimes. Most silvicultural treatments were successfully completed before the Russell Ridge Timber Sale defaulted in 1988...show more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236514033
  • 9781236514035