A working plan for forest lands near Pine Bluff, Arkansas . is of age. shows the volume growth in hoard feet for Shortleaf and LoblollyPine, the contents being calculated according to Doyles Rule. Between 80 and 140 years of age the Shortleaf Pine increases veryuniformly in merchantable contents, after which age the rate of SILVICrLTI RAL NOTES. 31 increase begins to fall off. The merchantable contents of ShortleafPine under 8»» years of age is somewhat uncertain, as the diametersbecome too small for accurate calculations. Between the ages of 60and 100 years the average yearly increase in merc
A working plan for forest lands near Pine Bluff, Arkansas . is of age. shows the volume growth in hoard feet for Shortleaf and LoblollyPine, the contents being calculated according to Doyles Rule. Between 80 and 140 years of age the Shortleaf Pine increases veryuniformly in merchantable contents, after which age the rate of SILVICrLTI RAL NOTES. 31 increase begins to fall off. The merchantable contents of ShortleafPine under 8»» years of age is somewhat uncertain, as the diametersbecome too small for accurate calculations. Between the ages of 60and 100 years the average yearly increase in merchantable contentsamounts to board feet, and between 60 and 200 years to feet. (See tig. 7.) Relation between diameter, total height, merchantable length,* crownlength, and clear (See fig. 8.)—The principal point of inter-est connected with this diagram is the rapid increase in the length ofmerchantable timber obtained from trees of 15 to 2-1 or 25 inches indiameter, and the small additional length obtained from trees of greater. 0 10 SO 30 40 50 60 70 B0 90 100 110 ISO 130 140 150 ABC- VCARS Fig. 6.—Diagram showing the height growth of Shortleaf and Loblolly Pine on the basis of age. diameters. The merchantable length is greatest in proportion to thetotal height when the tree has a diameter of 2<» inches. In this casea little more than one-half of the total height is merchantable. By comparing the curves tor clear length and for merchantablelength it will be seen that for trees below 19 inches in diameter themerchantable length is less than the clear length, while above thatdiameter the reverse is true. In other words, in trees over 19 inchesin diameter breasthigh (21 inches on the stump) the logs are cut upinto the crowns, the distance to which the cut extends into the crownincreasing as the diameter of the tree increases. ?Merchantable length is the total length of merchantable timber; in other word?,the sum of the log lengths. bClear length
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