Indian trust lands . --Indian lands held in trust by the Federal Government, for Indian tribal 

 groups or for individual allotments. 



State lands . --Lands owned by States or lands leased to these governmental units for 50 years 

 or more. 



County and municipal lands . --Lands owned by counties and local public agencies or 

 municipalities, or lands leased to these governmental units for 50 years or more. 



Private Ownership Classes 



Forest industry lands . --Lands owned by companies or by individuals operating wood-processing 

 plants. 



Farmer-owned lands. --Lands owned by farm operators. (These exclude lands leased by farm 

 operators from such nonfarm owners as railroad companies and States.) 



Other private lands . --Privately owned lands other than forest industry and farmer-owned 

 lands . 



Forest Type and Tree Species 



Forest types . --A classification of forest land based upon the species forming a plurality of 

 live-tree stocking. 



Forest trees . --Woody plants having a well-developed stem and usually more than 12 feet in 

 height at maturity. 



Commercial species . --Tree species presently or prospectively suitable for industrial wood 

 products . 



Softwoods . — Monocotyledonous trees, usually evergreen, having needles or scalelike leaves. 



Hardwoods . — Dicotyledonous trees, usually broad-leaved and deciduous. 



Area Condition Classes 



Stocking . — Stocking is an expression of the extent to which growing space is effectively 

 utilized by present or potential growing stock trees of commercial species. "Percent of 

 stocking" is synonymous with "percentage of growing space occupied" and means the ratio of actual 

 stocking to full stocking for comparable sites and stands. Basal area is used as a basis for 

 measuring stocking. 



"Stocking percentages" express current area occupancy in relation to specified standards for 

 full stocking based on number, size, and spacing of trees considered necessary to fully utilize 

 the forest land. 



Full utilization of the site is assumed to occur over a range of basal area. As an interim 

 guide, 60 percent of the normal yield table values has been used to establish the lower limit of 

 this range, which represents full-site occupancy. This is called 100-percent stocking. The 

 upper limit of full stocking has been set at 132 percent. Sites with less than 100-percent 

 stocking represent less than full-site occupancy. Overstocking is characterized by sites with 

 133 percent or more stocking. 



Class 10 . --Areas fully stocked (100 to 132 percent) with desirable trees and not overstocked 

 (133 percent or more) . 



Class 20 . --Areas fully stocked with desirable trees, but overstocked with all live trees. 



Class 30 . --Areas medium to fully stocked (60 to 99 percent) with desirable trees and with 

 less than 30 percent of the area controlled by other trees and/or inhibiting vegetation or 

 surface conditions that will prevent occupancy by desirable trees. 



