. 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. trees per acre on the lower sites and no more than 200 trees per acre on the higher sites. Plots were selected in extensive, homogeneous, even-aged stands, not in clumps of even-aged trees. I did this to avoid the selection of exceptionally fast-growing trees and to incorporate the total stand effect into the site index and height growth system. As time progresses, it will be necessary for managers to evalua
. 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. trees per acre on the lower sites and no more than 200 trees per acre on the higher sites. Plots were selected in extensive, homogeneous, even-aged stands, not in clumps of even-aged trees. I did this to avoid the selection of exceptionally fast-growing trees and to incorporate the total stand effect into the site index and height growth system. As time progresses, it will be necessary for managers to evaluate the productive capacity of these newly created stands. They will need a method of rating site and a method of predicting the course of stand height with age so that they may develop yield tables for second-growth ponderosa pine in the Pacific Northwest. This paper is a first step toward this goal. Therefore, these curves are most appropriately used in constructing yield tables for managed stands of ponderosa pine. The site curves will classify the growth potential of sample plots, and the height growth curves will express height development of even-aged stands attaining specified heights at index age. When Meyer's (1961) site index curves are used in inten- sively managed, even-aged stands, it is difficult to select what Meyer refers to as "representative dominant and co-dominant ; After trees are of merchantable size, all trees often appear to be dominants or codominants and selection can be subjective. In this study, I chose to elim- inate this difficulty by dealing with only the tallest trees in the stand and densities likely to be found in managed stands. Data Collection Thirty 1/5-acre circular plots were located throughout Oregon and parts of Washington (fig. 1). The plots had the following tree and stand characteristics: 1. The stand was pure ponderosa pine 95 to 180 years old at breast height and even-aged within 10 years. 2. Selective cutting or mort
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