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FORESTRY TERMS & DEFINITIONS

FORESTRY TERMS & DEFINITIONS. Basal Area—cross sectional area of a tree at breast height Borderline trees—trees which are near the edge (border) of a sample plot Cord—a stack of round wood measuring 4’ x 4’ x 8’ (128 cu ft).

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FORESTRY TERMS & DEFINITIONS

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  1. FORESTRY TERMS & DEFINITIONS Basal Area—cross sectional area of a tree at breast height Borderline trees—trees which are near the edge (border) of a sample plot Cord—a stack of round wood measuring 4’ x 4’ x 8’ (128 cu ft)

  2. Diameter breast height (DBH)—the outside bark diameter of a tree at 4.5’ above average ground level D.I.B.—diameter inside bark D.O.B.—diameter outside bark Fixed radius plots—circular plots having a particular radius which defines the plot boundaries

  3. Form class—a measure of butt-log taper; defined as the ratio of d.i.b. at top of the first 16’ log to d.o.b. at dbh Limiting distance—the maximum distance a tree can be from the sample point and still be tallied Log rule—a mathematical formula or set of diagrams developed for predicting the board feet of sawn lumber that can be recovered from logs of various sizes

  4. Log Volume Table—a table of board foot yields predicted by a given log rule for logs of various lengths & diameters Long Logs-sawtimber trees which have been limbed, topped & bucked at the upper limit of sawlog merchant-ability Lump sum sale—a sale of timber in which the purchaser pays a specified amount for the designated timber, usually in advance of cutting; payment is not dependent on volume harvested

  5. MBF—thousand board feet; used to measure sawtimber Overrun—a measure of how much more lumber was actually sawn from a given amount of logs Pay-as-cut sale—seller is paid based on yield of timber cut Point sampling—a method of timber inventory in which trees are sampled according to a specified sighting angle

  6. Roundwood—timber that is in round form, not chipped or sawn Scaling diameter—the dib at the small end of the log Shortwood—pulpwood bucked into short lengths (5’3” if shipped by rail; 6’, 7’, 8’ or 10’ lengths otherwise) Stumpage—standing timber

  7. Sighting angle—the angle described by a point-sampling instrument that determines which trees will be tallied from a particular point location Stumpage value—the value of standing timber Timber stand variability—lack of uniformity; natural stands tend to be much more variable than planted ones

  8. Ton—2000 pounds Topwood—the upper portion of a sawtimber, pole or plylog tree boles that is merchantable for pulpwood Tree volume table—a table which shows predicted volumes for standing timber of various sizes Tree length—refers to timber hauled to the delivery point with only the limbs & unmerchantable top removed

  9. Variable radius plots—plots in which the probability of a tree being sampled is proportional to its size Wedge prism—a piece of specially ground glass which bends light rays at a specified angle

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