. Field and computer techniques for stem analysis of coniferous forest trees. Conifers Physiology. Figure 10.—A dendro- chronograph was used to measure radial growth where annual rings were closely spaced. sanding, and our work supported that opinion. To make the annual rings more distinct, we used water for most species. For resinous wood of pines and occasion- ally Douglas-fir, we found that kerosene or other light oil was the best agent for enhancing the annual rings. Sophisticated wood-staining techniques were unnecessary. Where there was concern for radial shrinkage in the collected radia
. Field and computer techniques for stem analysis of coniferous forest trees. Conifers Physiology. Figure 10.—A dendro- chronograph was used to measure radial growth where annual rings were closely spaced. sanding, and our work supported that opinion. To make the annual rings more distinct, we used water for most species. For resinous wood of pines and occasion- ally Douglas-fir, we found that kerosene or other light oil was the best agent for enhancing the annual rings. Sophisticated wood-staining techniques were unnecessary. Where there was concern for radial shrinkage in the collected radial sections and transverse disks, the current year's or "green" radii were placed on the plastic overlays in the field. Two marks—pith center and section perimeter edge—were transcribed to these plastic overlays. Before laboratory ring counts and sequen- tial radial growth measurements were taken, green dimensions were restored by soaking the collected specimens in water (Herman and DeMars 1970) for at least 24 hours, then draining them overnight. Radii of green sections that were correctly marked on the plastic always corresponded closely to those of the water-re stored sections. Ring intervals for these field-selected repre- sentative radii then were marked off and measured according to the selected count plan. COMPUTER PROGRAM FOR STEM ANALYSIS DATA At least two previous programs using stem analysis data for computing and graphing tree growth are in existence (Brace and Magar 1968, Pluth and Cameron 1971). Both of these automated methods machine-plot derived tree growth parameters. Neither program provides a standard height-radius stem profile as provided in this paper. Both programs provide volume and basal area computa- tions that could be adapted for use with our program. 16. 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 pe
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