Data from 157 open-grown Sitka spruce (Piceasitchensis (Bong.) Carr.) and 102 western hemlock (Tsugaheterophylla (Raf.) Sarg.) at two locations in coastal Alaska and from 69 Sitka spruce on the Queen Charlotte Islands in British Columbia were used to develop height–diameter and crown width–diameter equations. Height–diameter relations for Sitka spruce were significantly different among all locations. Crown width–diameter relations were not significantly different. Common equations were fit to the spruce data and to the spruce and hemlock data independent of location and site index along the coast.

This file was created by scanning the printed publication. Mis-scans identified by the software have been corrected; however, some errors may remain. Yield tables generated by the stand simulation program DFSIM (Douglas-Fir SIMulator) are presented for. a number of possible management regimes. These include a "normal" yield table; tables for stands planted or precommercially thinned to 300 and 400 trees per acre; tables for commercially thinned stands with and without prior commercial thinning; and tables illustrating the effect of fertilization with nitrogen. Guides are presented for number of trees to be planted or left after precommercial thinning and expected time of first commercial thinning. AuthorsThese tables can be used as aids in choice of management regimes, guides to stocking control, and as a partial basis for estimating probable yields of future managed stands. Their limitations arise mainly from limitations of the basic data used in construction of DFSIM. Users are cautioned on some misinterpretations.

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The lack of growth and yield information for young even-aged western hemlock (Tsuga heterophylla (Raf.) Sarg.)-Sitka spruce (Picea sitchensis (Bong.) Carr.) stands in southeastern Alaska served as the impetus for a long-term stand-density study begun in 1974. The study has followed permanent growth plots in managed stands under various thinning regimes. Between 1974 and 1987, 272 plots were established at 59 locations throughout southeastern Alaska. Remeasurement of the plots occurs every two to four years and will continue until harvest. Additional thinnings will occur on a portion of the plots. Future plans include extending the study through establishment of installations in stand types not currently represented. Once data for an entire rotation are obtained, a comprehensive set of growth and yield tables for various management regimes can be developed. This information will answer questions forest managers have on whether and when to thin a stand, at what level of intensity, and how frequently to enter the stand.

1975. Field and computer techniques for stem analysis of coniferous forest trees. USDA For. Serv. Res. Pap. PNW-194, 51 p., illus. Pacific Northwest Forest and Range Experiment Station, Portland, Oregon. Field and computer techniques for stem analysis adaptable to both youngand old-growth conifers are presented. Field instructions include a step-by-step explanation of tree cutting, sectioning, ring count, and measurement techniques. A computer program adapted to field techniques reproportions a tree's radial measurement data, calculates height-agesite index information, punches the reproportioned and height-age-site index information on cards, and plots height-age and stem profile graphs. These stem analysis techniques are adaptable to trees of any size up to 800 years old and to either American or metric measures. These instructions enhance the usefulness of the stem analysis research method in obtaining growth information for forest managers.