. 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. 2. 3 Select a suitable plot with the following characteristics : (a) even-aged within 10 years , (b) no disease symptoms that would affect height, (c) no fine ring groups to in- dicate growth suppression, (d) internodal lengths con- sistent on taller trees, (e) no remnant understory vegetation that would indicate competition during early part of the stand's life. Establish boundaries of a circular 1/5-acre p
. 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. 2. 3 Select a suitable plot with the following characteristics : (a) even-aged within 10 years , (b) no disease symptoms that would affect height, (c) no fine ring groups to in- dicate growth suppression, (d) internodal lengths con- sistent on taller trees, (e) no remnant understory vegetation that would indicate competition during early part of the stand's life. Establish boundaries of a circular 1/5-acre plot. Measure height of the tallest tree on the plot. 4. Extract increment cores from the three tallest trees on the plot to obtain an aver- age breast-high stand age. 5. From breast-high age and total height, estimate the site index by one or more of the following alternatives. (a) Use figure 3 for rough field estimates. (b) For a more precise esti- mate, table 2 can be used to solve the equation, Site index - feet = a + b (height - feet). (c) The equation shown in the appendix will be useful for those wishing to program the estimating procedure in a computer. BREAST-HIGH AGE (years). 1 i I i i»it l i I i I i I i I 0 20 40 60 80 100 120 140 160 TOTAL HEIGHT OF THE TALLEST TREE IN A 1/5-ACRE PLOT (feet) Figure 3.—Site index curves for even-aged, managed stands of ponderosa pine in the Pacific Northwest. 5. 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 Barrett, James W. (James Willis), 1922-; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ); United States. Forest Service. cn. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
Size: 2389px × 1046px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
