. Biennial report, 1958-1959. Forests and forestry Alaska. 140 X liJ o — 100. 6 8 10 6-node span (feet) 14 Figure 8. --Graph for estimating site index from measurements of 6-node span, with confidence limits for the 95 percent level of probability. Without exception the cotyledons and primary leaves of 1-year seedling white spruce were serrulate on the margins (fig. 9) while similar leaves of black spruce were entire. In addition, white spruce averaged more cotyledons per seedling than black spruce. Serrulations proved to be a reliable characteris- tic on seedlings up to about nine or ten year
. Biennial report, 1958-1959. Forests and forestry Alaska. 140 X liJ o — 100. 6 8 10 6-node span (feet) 14 Figure 8. --Graph for estimating site index from measurements of 6-node span, with confidence limits for the 95 percent level of probability. Without exception the cotyledons and primary leaves of 1-year seedling white spruce were serrulate on the margins (fig. 9) while similar leaves of black spruce were entire. In addition, white spruce averaged more cotyledons per seedling than black spruce. Serrulations proved to be a reliable characteris- tic on seedlings up to about nine or ten years of age. The gap in identification characteristics is between this age and the age when distinguishing features characteristic of mature trees are developed. Additional details as well as a summary of the experience of other investigators is given in Technical Note No. 45, "Identification of spruce seedlings in Inter- ior Alaska". W Forest Soil Organic Layer Development. --Samples of unincorporated forest soil organic layers from three stands of different ages indicated the re- lationship of weight to time shown in fig. 10. At the end of 125 years, 20 per- cent of the mature weight was accumulated. An additional 50 percent was 17. 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 Alaska Forest Research Center (U. S. ). Juneau, Alaska : Alaska Forest Research Center, U. S. Dept. of Agriculture, Forest Service
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