FOREST TERMINOLOGY 87 



Nursery. See Forest tree nursery. 



Old growth. See Virgin forest. 



Open, a. See Crown density. 



Oppressed. See Crown class. 



Organization. See Forest organization. 



Over-cut. The cutting of a quantity of timber in excess of the annual growth of 



the forest or of the annual felling budget. 

 Overmature forest. Forest on which, as the result of age, growth has almost 



entirely ceased, and decay and deterioration have begun. See also Mature 



forest. 

 Over-stock. • A growing stock greater than the normal growing stock. In natural 



regeneration, a condition of an excessive number of individuals hindering each other 



in development and retarding desirable differentiation into crown classes. 

 Overwood. See Composite forest. 

 Park forest. A forest in which the trees stand apart from one another or in detached 



groups. A very open forest in which usually also the characteristic forest floor 



is replaced by grasses. 

 Periodic annual increment. See Increment. 

 Periodic increment. See Increment. 

 Permanent tjrpe. See Forest type. 

 Physical factor. Any inorganic component of a site capable of influencing its 



forest-producing power, such as altitude, slope, aspect, soil, and subsoil. See 



Site. 

 Physical type. See Site. 

 Pit planting. See Forest planting. 

 Planted forest. See Forest plantation. 

 Planting area. See Forest planting. 

 Planting board. See Transplant board. 

 Planting plan. See Forest planting and working plan. 

 Planting stock. See Forest planting. 

 Pole. See Tree class. 

 Polewood. See Development class. 

 Pollard, n. A tree whose crown has been cut back to invite the production of 



shoots. 



G., Kopfholz. F., tetard. 

 Pollard, V. Lopping the top of a tree to invite the production of shoots from the top . 



G., kopfen. F., eteter, ^cimer. 

 Possibility. {Obs.) See Regulation of cut. 

 Preparatory cuttings. See Reproduction, Shelterwood method. 

 Preparatory stage. See Reproduction, Shelterwood method. 

 Present yield table. {Ohs.) See Yield table. 

 Price increment. See Increment. 

 Profit. See Income. 



Progress map. See Working plan control. 

 Protection forest. A forest whose chief value is to regulate streamflow, prevent 



erosion, hold shifting sand, or exert any other indirect beneficial effect. It may 



or may not produce timber. 



G., Schutzwald, Bannwald. F., forSt de protection. 



