. Growth and mortality of ponderosa pine poles thinned to various densities in the Blue Mountains of Oregon. Ponderosa pine, Thinning, Blue Mountains (Or. and Wash. ); Ponderosa pine, Blue Mountains (Or. and Wash. ), Growth; Mountain pine beetle, Blue Mountains (Or. and Wash. ); Forest health, Blue Mountains (Or. and Wash. ). 350 300 x « ~0 250 c £~ 200 vt c » "O 150 T3 C ° 100 (/) 50 0 55 60 65 70 75 80 85 90 Total stand age (yr) Figure 2—Stand density index of live trees (treatment means) in relation to total age and year for each GSL Each growing stock level was replicated three times.
. Growth and mortality of ponderosa pine poles thinned to various densities in the Blue Mountains of Oregon. Ponderosa pine, Thinning, Blue Mountains (Or. and Wash. ); Ponderosa pine, Blue Mountains (Or. and Wash. ), Growth; Mountain pine beetle, Blue Mountains (Or. and Wash. ); Forest health, Blue Mountains (Or. and Wash. ). 350 300 x « ~0 250 c £~ 200 vt c » "O 150 T3 C ° 100 (/) 50 0 55 60 65 70 75 80 85 90 Total stand age (yr) Figure 2—Stand density index of live trees (treatment means) in relation to total age and year for each GSL Each growing stock level was replicated three times. A randomized complete block design was used to place a complete replication on each of the three different soils. Replication three is about 3 miles from replication one, and replication two is about half way between replications one and three. Installation and Square plots or acre in size, with additional 33-foot buffer strips, were used. Measurements Buffer strips received the same treatments as did the associated plots. Stand open- ings prevented the use of larger plots. A pretreatment inventory of diameters at breast height () was taken for each plot, and the plots and buffer strips were precommercially thinned in fall 1967. Thinning slash was lopped and scattered. In spring 1968, each was measured to the nearest inch, and 15 trees on each plot were selected for measuring with an optical dendrometer. Selection of these trees was made randomly at the beginning of the study within 1-inch diameter classes across the range of tree sizes. Stem volumes inside bark, including stump and tip, in cubic feet (V) were calculated for each of these selected trees by using equations from Grosenbaugh's (1964) STX program with a modification to describe bark thickness along the bole (Cochran 1976). Coefficients for the volume equation (Husch and others 1972), logeV = a + b[loge()] , (4) were computed for each plot, and plot volumes were then calculated
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