The theory and practice of working plans (forest organization) . ualthe same per cent of the total yield of the forest for the rota-tion as the period bears to the rotation. Thus, for a givendecade in a hundred-year rotation, the area maturing shouldyield one-tenth of the yield of the forest during one hundredyears. Normal age class distribution in the strict sense of actuallocation means such distribution of age classes as will permitannual or periodic fellings to be made without damage toadjoining stands. Normal increment is the best increment attainable bygiven species on given sites. Norma
The theory and practice of working plans (forest organization) . ualthe same per cent of the total yield of the forest for the rota-tion as the period bears to the rotation. Thus, for a givendecade in a hundred-year rotation, the area maturing shouldyield one-tenth of the yield of the forest during one hundredyears. Normal age class distribution in the strict sense of actuallocation means such distribution of age classes as will permitannual or periodic fellings to be made without damage toadjoining stands. Normal increment is the best increment attainable bygiven species on given sites. Normal growing stock is the amount of material representedby the stands in a normal forest. Such a normal forest probably does not exist; it is merely1 2 THE THEORY AND PRACTICE OF WORKING PLANS a theoretical ideal towards which to strive. Assuming, there-fore, that every forest is more or less abnormal, it is necessaryto determine the degree of abnormality in the foUowing direc-tions : 1. Increment. 2. Growing Stock. 3. Distribution of the Age Classes. Diagram A F. In this connection it should be noted that while normaHty inI and 3 of themselves result in normality in 2, the reverse isby no means the case. A normal growing stock may exist in aforest with only a single age class. Valuable as its determina- THE THEORY AND PRACTICE OF WORKING PLANS 3 tion is, therefore, it should never be used as the sole criterionof regulating the cut. This may be shown diagrammaticallyas on page 2. The Increment Increment (syn. accretion, growth) may be defined as theincrease in diameter, sectional area, height, volume, quality orvalue of a tree or a stand. Three principal kinds of increment are distinguished: Volume increment is the increase in volume of a tree orstand. Quality increment is the increase in value per unit of volumedue to its augmented intrinsic worth. Price increment is the increment in the sale value of forestproducts independent of quality increment, due to market con-ditions. Inc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
