Delimber slasher buncher -See harvesting machine classifications, multifunction machines . Delimbing -See harvest functions . Depletion allowance -Deduction from taxable income derived from a wasting asset. D.g.l -Diameter at groundline. Diameter at ground line -Diameter measure of a standing tree at the estimated cutting height.
Diameter classes -Classification of trees based on diameter outside bark measured at d.b.h.
Directional felling -Predetermining the way a tree will land when it hits the ground. Direct seeding -Spreading seed s over the forest seedbed by hand or machine. Discharge spout -See portable chipper terms . Discounted cash flow -In evaluating investment opportunities, the various costs and benefits anticipated in future years discounted to the present. Disturbance time -See machine time , scheduled operating time , operating time , delay time , nonmechanical delay time .