226 LAND VALUATION 



Northern swamp type. 



Southeastern ridge type. 



Chapparal type. 



Pinon-juniper type. 



Western yellow pine on semi-arid sites. 



While these types are too slow growing to make it worth while to 

 raise timber on them they usually have secondary uses which 

 justify their being kept wooded. 



An average yield of 500 board feet per aimiun includes a larger 

 nimiber of types. While this may seldom be found imder virgin 

 conditions in the following types it is obtainable under manage^ 

 ment: 



Northern spruce. 



Northern hardwoods. 



Cove. 



Slope. 



Southern pine. 



Western yellow pine on moist sites. 



Lodgepole pine. 



Engehnann spruce. 



Sugar pine. 



These lands wiU yield good returns with rotations of less than 

 100 years. In other words, they can be profitably employed for 

 the production of ties, pulpwood and boxboards but they will not 

 ,grow large sized sawtimber. 



In fact it is only the types of timberland which wiU yield at 

 the rate of 1000 board feet per acre per annum on which large sized 

 sawtimber may be profitably grown. Fortimately these are 

 scattered rather evenly thruout the United States. In the north- 

 east there is the white pine type. The southeast has the overflow 

 bottomlands. Only the Rocky Mountain region has too severe a 

 climate to permit such rapid growth. In the Pacific northwest 

 there are the silver pine, cedar flat, Douglas fir, and redwood 

 types. 



The length of rotation is an exceedingly important item be- 



