. Height growth and site index curves for managed, even-aged stands of ponderosa pine in the Pacific Northwest. Site index (Forestry) Northwest, Pacific; Ponderosa pine Northwest, Pacific. The following are alternatives for estimating the anticipated height of the tallest trees of a stand on land of known site index: 1. Use figure 2 for rough field estimates. 2. For a more precise estimate, table 1 can be used to solve the equation, Total height - feet = a + b (site index - feet). 3. The equation shown in the appendix will be useful for those wishing to program the estimating procedure
. Height growth and site index curves for managed, even-aged stands of ponderosa pine in the Pacific Northwest. Site index (Forestry) Northwest, Pacific; Ponderosa pine Northwest, Pacific. The following are alternatives for estimating the anticipated height of the tallest trees of a stand on land of known site index: 1. Use figure 2 for rough field estimates. 2. For a more precise estimate, table 1 can be used to solve the equation, Total height - feet = a + b (site index - feet). 3. The equation shown in the appendix will be useful for those wishing to program the estimating procedure in a computer. ESTIMATING SITE INDEX Site index curves relate to the productivity potential of land. They give the estimated height of the tallest tree at 100 years in relation to its height and breast- high age. Many of the same plot qualifications used in the study are applicable in selecting plots for estimating site index. The following steps and precautions are recommended for estimating the site index of a managed stand. 180 160 140 120 t ioo u s < o E-i 80 - 60 40 - 20. _1_ _ _1_ 20 40 60 80 100 BREAST-HIGH AGE (year.) 120 140 Figure 2.—Height growth curves for managed, even-aged stands of ponderosa pine in the Pacific Northwest. Heights represent the tallest trees in the stand. Table 1—Values for a and b by years for the family of regressions^-^ for estimating height of the tallest trees in a newly established stand of ponderosa pine where site index and age are known Years between decades high age 0 1 2 3 4 5 6 7 8 9 a b 3 b a b a b a b a b a b a b 2 b a b Years 20 0 325 0 342 -5 381 0 359 -5 587 -5 755 0 390 0 406 0 420 -6 061 0 434 0 448 30 475 488 -6 089 500 -6 043 .512 -5 982 524 536 547 -5 735 559 569 .580 40 591 601 -5 167 611 -5 037 .621 -4 905 631 640 649 -4 491 659 668 .677 50 685 694 -3 781 702 -3 639
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