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"wet." In total, 227,511 acres or 17 percent of the total Forest Service <br />ownership is classified as non-forest. The balance of NFS lands, 1,107,593 <br />acres or 83 percent of the total ownership, is cover typed as forestland. <br />Specie composition on the forested land consists of 61,869acres of aspen <br />(5.6 percent of forested area), 12,257 acres of douglas fir (1.1 percent of <br />forested area), 11,546 acres of Limber pine (1.0 percent of forested area), <br />87,849 acres of ponderosa pine (7.9 percent of forested area), 306,000 acres <br />of spruce-fir (27.6 percent of forested area). Lodgepole pine occupies <br />627,963 acres or 57 percent of the total forest area. Rocky Mountain <br />Juniper occupies about 70 acres and will not be considered further in this <br />analysis. <br />Average size class of the stand represented by the polygon further <br />characterizes forest cover type. Size classes for each stand (polygon) <br />consisted of N(non-stocked), E(seedlings 0.0-0.9" DBH), S(seedlings 1.0- <br />4.9" DBH), M(saplings 5.0 -8.9" DBH), L(poles 9.0-15.9" DBH), and V <br />(sawtirnber 16" + DBH). For purposes of further analysis, some af the <br />classes were combined and four general size class categories were retained <br />1) non-stocked (N), 2) seedlings (E + S), 3) poles (M), and 4) sawlogs (L + <br />V). The lumping was necessary to coincide with the stand age data also <br />provided by the Forest Service. Approximately one percent of all Forest <br />Service land currently typed as forested is non-stocked (N), 10-11 percent is <br />in the seedling stage (E+S), 30 percent is in the pole class, and the balance <br />of over 55 percent is in the sawtimber class (L+V). However, only two <br />percent of the total forested area is occupied by sawtimber stands that <br />average 16" DBH and larger. The percentages are similar across all <br />management classes (e.g. Wilderness, Suitable for Harvest, etc.). <br />Secondary Data <br />Age Distributions <br />In addition to the GIS-generated polygon data, file data from field surveys <br />were also provided that describe average stand age by species for the four <br />size classes. Initially, separate stand age data was provided by each of the <br />three forests but regression analysis did not demonstrate significant <br />differences in the age/size class relationships between forests, so the data <br />were combined. Models were then fit to predict average basal area (Y) for <br />`each of the stand size classes, as a function of age (X) for each forest <br />24