. Bulletin of the Department of Agriculture. Agriculture; Agriculture. LIFE HISTORY OF SHORTLEAF PINE. 11 constancy and, so far as is known,1 has never before been found to exist in any North American tree species. It was found to hold true for all crown classes within a range of ages from 20 to 80 years, rep- resenting average diameters up to about 16 inches. Indications point to this relation holding true beyond 80 years, although no meas- urements in pure shortleaf pine have been made. Later measure- ments by Prof. H. H. Chapman, of Yale Forest School, indicate a. 4 6 8 10 12 14- 16 16
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. LIFE HISTORY OF SHORTLEAF PINE. 11 constancy and, so far as is known,1 has never before been found to exist in any North American tree species. It was found to hold true for all crown classes within a range of ages from 20 to 80 years, rep- resenting average diameters up to about 16 inches. Indications point to this relation holding true beyond 80 years, although no meas- urements in pure shortleaf pine have been made. Later measure- ments by Prof. H. H. Chapman, of Yale Forest School, indicate a. 4 6 8 10 12 14- 16 16 20 TREE DIAMETER BREAST HIGH-INCHES Fig. 4.—Relation of crown width to diameter of tree. (Shortleaf pine, 11 to 60 3rears old, in Arkansas.) constant relation between the diameter and crown in mixed short- leaf and loblolly pine stands from 80 up to 200 years; also recent deductions from yield and growth data of red spruce show a definite relation existing between basal area and growing space in even-aged stands between 20 and 100 The evidence from which the conclusion is drawn is shown in figure 4, based on 545 trees on 25 sample plots, representing 16 different ages, 1 Determined in January, 1913, from measurements taken in November and December, 1912. 2 By L. S. Murphy, Forest 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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