. Procedure for developing a site index estimating system from stem analysis data. Site index (Forestry). Thus : y = 19. 452x and after reconverting y and x: b = 0. 611 + 19. 452/A (2) This curve is shown in figure 3. REGRESSION COEFFICIENT ( b ) 0 10 20 30 40 50 60 70 TREE AGE ( years ) Figure 3.—Regression coefficients for the relationsh ip of site index to height, plotted over age. Step 7 An equation which generates site index for any combination of age and height resulted when equation 2 was substituted for b in equation 1. Thus: S = (0. 61
. Procedure for developing a site index estimating system from stem analysis data. Site index (Forestry). Thus : y = 19. 452x and after reconverting y and x: b = 0. 611 + 19. 452/A (2) This curve is shown in figure 3. REGRESSION COEFFICIENT ( b ) 0 10 20 30 40 50 60 70 TREE AGE ( years ) Figure 3.—Regression coefficients for the relationsh ip of site index to height, plotted over age. Step 7 An equation which generates site index for any combination of age and height resulted when equation 2 was substituted for b in equation 1. Thus: S = (0. 611 + 19. 452/A)H (3) DAHMS1 MODIFICATION An evolution of the above procedure is already underway. In developing site curves for lodgepole pine, Dahmsl^ took the height of only the tallest of six trees on a plot at each of several stand ages. Although this left him with only one-sixth the amount of data that would have been available under the procedure described in this report, there is a good chance, at least in his case, that he avoided a serious bias. Except for this one modification, Dahms used the pro- cedure described above. — Dahms, Walter G. Correction for a possible bias in developing site index curves from sectioned tree data. Jour. Forestry 61: 25-27, illus. -6-. 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 Johnson, Floyd A. (Floyd Alfred), 1911-; Worthington, Norman P. , 1903-; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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