. Site index and height growth curves for unmanaged even-aged stands of western hemlock and sitka spruce in southeast Alaska. Western hemlock Alaska; Sitka spruce Alaska; Forest management Alaska; Site index (Forestry) Alaska. Figure 14 —Site index curves for unmanaged, even-aged Sitka spruce in southeast Alaska. Dashed lines connect decadal points derived from the unsmoothed basic data regressions of (S - feet) = a2 + b2 (HT - feet). Solid lines represent smooth curves from a rearrangement of the estimating equation. 220 200 180 160 140 "35 a> 120 .5> 100 80 60 - 40 - 20 -.
. Site index and height growth curves for unmanaged even-aged stands of western hemlock and sitka spruce in southeast Alaska. Western hemlock Alaska; Sitka spruce Alaska; Forest management Alaska; Site index (Forestry) Alaska. Figure 14 —Site index curves for unmanaged, even-aged Sitka spruce in southeast Alaska. Dashed lines connect decadal points derived from the unsmoothed basic data regressions of (S - feet) = a2 + b2 (HT - feet). Solid lines represent smooth curves from a rearrangement of the estimating equation. 220 200 180 160 140 "35 a> 120 .5> 100 80 60 - 40 - 20 -. Site index (feet) 120 100 - 80 60 20 40 60 80 100 Age at breast height (years) 120 140 160 Figure 15 — d2 values for Sitka spruce in the equation (HT — feet) = c2 + d2( feet) as a function of age. Plotted points are actual d2 values. Solid line is a curve expressed by the equation d2 = e"6, where x6 is defined in the text. Standard error is and r2 is 16 - 04 20 40 60 80 100 120 140 160 Age at breast height (years) Values for c2 are given in table 5. The c2 and d2 values in table 5 can be used to estimate at any age total height of the average among the 40 largest diameter trees per acre on land of known site index. 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 Farr, Wilbur A. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ) cn. [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
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