328 APPENDIX 



tion. A tree reserved primarily in order to seed the felling area is 

 termed a seed tree. See Reproduction, Seed tree method. A tree 

 held over from harvest to grow into or through a second rotation, 

 usually to secure increased diameter development, may be termed a 

 hold-over. A tree reserved in coppice cutting is termed a standard. See 

 Reproduction, Coppice with standards. 



2. A tract of forest set aside for forest management. 

 Syn. : national forest. 

 Restock. Sec Reforest. 



Revision of working plan. The rewriting of a working plan at the end of, 

 or during the working period. Such renewals may be made at fixed 

 intervals of, say, lo years, or at irregular intervals, as is commonly the 

 case where revised data or changes in prevailing market conditions, 

 etc., necessitate modification of the original plan. 

 Ride. A term used in EngHsh literature for opened up division lines 

 between compartments. 



G., Schneisse, Gestell. F., laie. 

 Ripe. See Mature forest. 

 Root sucker. A sprout from a root. 



Rotation. The predetermined time period during which it is intended to 

 cut over a working group; the predetermined, approximate felling age 

 of stands. Rotation refers to the forest as a whole and is expressed 

 not by a definite year, but a period of lo to 20 years; Jelling age refers 

 to a stand and a definite year. 



Rotations are determined either by technical, economic, or financial 

 considerations; silvicultural considerations exercising a hmiting 

 influence. 



Technical rotations attempt to produce the maximum amount of 

 material suitable for a certain purpose, such as railroad ties, mine 

 timbers, saw logs of given size. 



Economic rotations attempt to secure either the maximum average 

 volume production, or the maximum average value production. 



Financial rotations introduce considerations of cost and attempt to 

 secure either the maximum forest rent or maximum soil rent {q. v.). 

 Syn.: income rotation. 

 G., Umtrieb, Turnus. F., revolution. 

 Row planting. See Forest planting. 

 Sale value. See Value. 



