. Procedure for developing a site index estimating system from stem analysis data. Site index (Forestry). THE PROCEDURE Step 1 Heights of the various cuts were plotted over corresponding ages for each of the 43 trees, and adjacent points were connected by straight lines. Figure 1 illustrates this step for tree number 26. TREE HEIGHT (feet) 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 TREE AGE ( years ) Figure 1.—Height over age for tree No. 26 Step 2 Heights from the segmented curves constructed in step 1 were listed for each of the following ages: 10, 15, 20, 25, 30, 35, 40, 45, 50
. Procedure for developing a site index estimating system from stem analysis data. Site index (Forestry). THE PROCEDURE Step 1 Heights of the various cuts were plotted over corresponding ages for each of the 43 trees, and adjacent points were connected by straight lines. Figure 1 illustrates this step for tree number 26. TREE HEIGHT (feet) 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 TREE AGE ( years ) Figure 1.—Height over age for tree No. 26 Step 2 Heights from the segmented curves constructed in step 1 were listed for each of the following ages: 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, and 70. These heights are shown in table 2 for age 30. All 43 trees were at least 30 years old when cut. The uppermost segment of the curve for each of the 13 trees which were less than 50 years old when cut was extended to intercept age 50. Thus, the table for age 50 corresponding to table 2 also contained 43 trees. These 13 extrapolations covered only a few years at the most and were considered entirely acceptable. Tables for ages 60 and 70 had fewer than 43 trees because extrapolations to ages 60 and 70 were not acceptable for all trees. An example of what was considered to be an acceptable extrapolation may be seen in figure 1 as the broken line extension of the last segment to age -2-. 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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