. 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. Comparison of Thirty-one plots in the 1977 sample contained western hemlock and Sitka spruce Site Indexes of site trees. For these plots, the relationship between site index of the two species Western Hemlock wag. and Sitka Spruce Hemlock site index = + (site index of Sitka spruce)-where the stan- dard error was , and the coefficient of determination (r2)
. 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. Comparison of Thirty-one plots in the 1977 sample contained western hemlock and Sitka spruce Site Indexes of site trees. For these plots, the relationship between site index of the two species Western Hemlock wag. and Sitka Spruce Hemlock site index = + (site index of Sitka spruce)-where the stan- dard error was , and the coefficient of determination (r2) was ; spruce site index = — + (site index of western hemlock)—where the standard error was , and r2 was Estimating Height Growth Height growth curves define the average pattern of height growth in stands of known site quality. They are appropriately used for constructing yield tables but do not provide optimum estimates of site index from measured height and age in a stand (Curtis and others 1974). Figures 4 and 5 can be used to make rough estimates of mean height of hemlock and spruce representative of the 40 trees of largest diameter per acre. For more precise estimates of mean total height of the 40 trees of largest diameter per acre, use values in tables 4 or 5 in the equation: Total height — feet = c, + d, (site index — feet). Equations in the appendix will be useful for those wishing to use a computer 0 20 40 60 80 100 120 140 160 Age at breast height (years) Figure 4 —Height growth curves for unmanaged, even- aged western hemlock in southeast Alaska. Heights represent the mean among the 40 largest diameter trees per acre. 9. 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 (Por
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