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Geographic Information System model rating old-growth stand significance on the Olympic National Forest Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/st74cr12z

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  • With increased attention being focused on the remaining old-growth forest resource in the Pacific Northwest a way to ecologically rate forest stands is needed to assist the U.S. Forest Service in its management decisions. A Geographic Information System (GIS) model was developed to rate old-growth stands in a 49,500 acre study area on the Olympic National Forest. The model utilizes the vector based PC Arclnfo package and the raster based OSU Map Analysis Package (MAP). The ecological rating was performed on individual sub-models which represent one specific ecologic criterion. Sub-model significance curves were used to rate the ecological value of the old-growth stands based on distance from the specific ecologic criteria. Five main ecological criteria were used: 1) core area, 2) spatial corridors, 3) riparian corridors network, 4) stand isolation, and 5) Northern Spotted Owl locations. In addition, the model also considers edge effect and the placement of Spotted Owl Habitat Areas (SOHA). The flexibility of the GIS model allows for the development of many different types of final map layers depending on the management criteria being addressed. The sub-models in this paper were combined to created a final map layer showing the initial rating of old-growth stands based on the above criteria. This final map can be used as a preliminary guide for the future placement of timber sales in areas with the least ecological impact on the old-growth ecosystem.
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