Concerning Site 11 



all species which at 100 years have their dominant timber from 

 90 to 110 feet tall (or corresponding values for fully stocked stands) 

 may well be applied one and the same classification standard, 

 both as to limits and intervals. If this is granted it remains to be 

 seen what species belong together and how many different stand- 

 ards are desirable. Germany works really w4th three standards, 

 for five species; in fact other species are fitted in as the case 

 warrants. 



With the large number of species in the United States it might 

 appear that a large number of standards are needed in keeping 

 with the great variety in the rate and character of growth of timber. 



The following suggestion is based on a considerable niimber of 

 published values of height growth. The intervals between groups 

 or standards a, b and c are taken, arbitrarily, of course, at 20 feet 

 in site I ; the intervals between classes at 20 feet, 15 feet and 10 feet 

 for the three groups. 



Standards of Site Classification 

 Based on the Height of Tree at 100 Years 



Site Standard a Standard b Standard c 



I no feet 90 feet 70 feet 



II 90 75 60 



III 70 60 50 



IV 50 45 40 



Standard a, site I, has timber 100 feet and over in height at 

 100 years and would include chiefly the Pacific coast giants on 

 their native sites. 



Standard b, site I, 80 to 100 feet in height, includes Eastern and 

 Western White pine. Sugar pine, Western Yellow pine in Cali- 

 fornia and Oregon; Norway, Loblolly, Cuban, Longleaf, Shortleaf, 

 Pitch and Jersey pines ; Noble fir. Of hardwoods : Yellow poplar, 

 chestnut, Black oak and Red oak, and probably most of our 

 good hardwoods in Southern Michigan and the Ohio valley. 



Standard c would include Western Yellow pine, and Douglas fir 

 of the Rockies, Eastern spruce, tamarack, White fir, hemlock. 

 Jack pine, White oak, hickory. Yellow birch. Sugar maple, beech 

 in Northern woods. 



What shall be done with eucalyptus, with cotton wood in river 

 bottoms, with Pinon, Mesquite, and shall Redwood and Douglas 

 fir have their own standard, are still questions to be debated. 



It may seem like playing with a few figures to even suggest the 



