. Forest mensuration. outside bark with on the stump for all trees falling in the given stump-diameterclass. Stump tapers may be taken on the butt logs of felled trees in themeasurement of volumes (§ 168). The number of measurements soobtained is often insufficient and may be supplemented by measuringthe diameter at stump height and width of bark to get , on stand-ing trees, together with Owing to the great variation in diam-eters at the stump compared with , a large number of stumptapers are required to produce a curve free from irregularities, as illus- CORRE
. Forest mensuration. outside bark with on the stump for all trees falling in the given stump-diameterclass. Stump tapers may be taken on the butt logs of felled trees in themeasurement of volumes (§ 168). The number of measurements soobtained is often insufficient and may be supplemented by measuringthe diameter at stump height and width of bark to get , on stand-ing trees, together with Owing to the great variation in diam-eters at the stump compared with , a large number of stumptapers are required to produce a curve free from irregularities, as illus- CORRELATION OF STUMP GROWTH WITH OF TREE 349 trated in Fig. 70 for loblolly pine. These data can be obtained verj^rapidly and without much extra cost. These stump tapers are then classified on the basis of diam-eter inside bark and not on since they are to be plotted on thecurve of stump diameter. An arithmetical average of these relationsis obtained, and expressed in the form of Table LII (p. 3£0).. 8 10 20 30 40 Age of Tree including Seedling 50 Fig. 70.—Diameters, inside bark at stump, outside bark at , and inside barkat 16 feet above stump, for trees at different ages. Loblolly pine, old fields,Urania, La. The outside bark for each stump-diameter class is nowplotted on the curve of on the stump as shown in Fig. 70. Sincethis curve is based on age of tree, the diameter at any point on thebole of a tree of a given age will fall on the indicated vertical line cor-responding to this age. Thus, a tree measuring 14 inches on the stumpin Table LH is 30 years old at the stump, and 33 years old whencorrected for age of seedling which is 8 years. The for a 14-inch stump is inches, which is plotted above 33 years. In thesame way, at the top of the first 16-foot log, which is inches,would fall above the same 33-year point on the scale. In this mannerthe stump tapers are each plotted by first finding the corresponding 550 GRO
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
