. TRIM timber projections : an evaluation based on forest inventory measurements. Forests and forestry Mensuration Mathematical models; Forest surveys North Carolina. I Site class Figure 13—Acreage of natural pine timberland aggregated in three site classes (from the 1974 and 1984 FIA measurements). The inputs were developed to simulate the shift of acres among three site classes; the site class 1 acres were moved into the inventory from the donor category, and the site class 2 and 3 acres were moved out of the timber base and into the donor category. Inventory volume declined based on the vol
. TRIM timber projections : an evaluation based on forest inventory measurements. Forests and forestry Mensuration Mathematical models; Forest surveys North Carolina. I Site class Figure 13—Acreage of natural pine timberland aggregated in three site classes (from the 1974 and 1984 FIA measurements). The inputs were developed to simulate the shift of acres among three site classes; the site class 1 acres were moved into the inventory from the donor category, and the site class 2 and 3 acres were moved out of the timber base and into the donor category. Inventory volume declined based on the volume per acre associated with the acres removed from each age class of the inventory. Incoming acres contributed to the inventory volume based on the corresponding yield table volume and regenera- tion stocking ratio assigned stocking level 2 (once volume was assigned, all acres were shifted to stocking level 1 and were averaged into the inventory there). The volume on acres entering site class 1 was assumed to border between site classes 1 and 2. The stocking ratio assigned to entering acres, therefore, was calculated with acres in site classes 1 and 2 and the site class 1 yield table. Under the average site projection scheme, acres were simply moved out of the aggregate inventory to the donor reserve. Harvest of the acres removed from the natural pine type was simulated by calibrating total harvest to exclude the net volume "lost" to the donor category. 25. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, John R; Pacific Northwest Research Station (Portland, Or. ). [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
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