Table 2. 



-Estimates of sampling error for area and volume, Indiana, 

 1950 



Commercial forest 



Growi 



ng stock 



Sawtimber 



Area 



Sampling 

 error 



Volume 



Sampling 

 error 



Volume 



Sampling 

 error 



Thousand 





Million 





Afillion 





acres 



Percent 



cubic feet 



Percent 



board-feet 



Percent 



4,045 



1.2 



2,598 



1.8 



11,010 



2.S 



2,000 



1.7 



2,000 



2.1 



5,000 



3.7 



1,000 



2.4 



1,000 



2.9 



1,000 



8.3 



500 



3.4 



500 



4.1 



500 



11.7 



50 



10.8 



SO 



13.0 



SO 



37.0 



10 



24.1 



10 



29.0 



10 



82.9 



from growing 



stock 



{■percent) 



59.0 



Sampling 



error 



(percent) 



5.0 



24. 



3 



33.9 



4. 



9 



22.3 





4 



43.9 



4 



3 



4.3 



1. 



7 



4.3 



1. 



5 



4. 1 



1. 



2 



14. 9 





5 



24.7 



1. 



8 



7.8 



• 



4 



14.9 



errors in reporting, in compilation, in determination 

 of overrun and residue factors, and in sampling. The 

 follov^'ing tabulation shows the computed sampling 

 error by commodity and the percentage that the 

 commodity is of the total timber cut: 



All timber cut 



Commodity: 



Sawlogs 



Fuelwood 



Fence posts 



Miscellaneous farm timbers .... 



Veneer bolts 



Cooperage bolts 



Handle bolts 



Pulpwood 



Hewn ties 



Round mine timbers 



Excelsior and other 



Total 100.0 



Explanation of Terms Used 



Forest Land Classes 



Forest land area. — Includes (a) land which is at 

 least 10 percent stocked by trees of any size and 

 capable of producing timber or other wood products, 

 or of exerting an influence on the climate or on the 

 water regime; (b) land from which the trees described 

 in (a) have been removed to less than 10-percent 

 stocking and which has not been developed for other 

 use; (c) afforested area. 



Commercial forest land area. — Forest land which 

 is (a) producing, or physically capable of producing, 

 usable crops of wood (usually sawtimber), (b) eco- 

 nomically available now or prospectively, and (c) not 

 withdrawn from timber utilization. 



Noncommercial forest land area. — Forest land 

 (a) withdrawn from timber utilization through statute, 

 ordinance, or administrative order but which other- 

 wise qualifies as commercial forest land, and (b) 

 incapable of yielding usable wood products (usually 

 sawtimber) because of adverse site conditions, or so 

 physically inaccessible as to be unavailable eco- 

 nomically in the foreseeable future. 



Forest Types 



VVhite-red-jack pine. — Forests in which 50 percent 

 or more of the stand is eastern white pine, red pine, or 

 jack pine, singly or in combination. (Common 

 associates include hemlock, aspen, birch, and maple.) 



Loblolly-shortleaf pine. — Forests in which 50 

 percent or more of the stand is loblolly pine, shortleaf 

 pine, or other southern yellow pines excepting long- 

 leaf or slash pine, singly or in combination. (Common 

 associates include oak, hickory, and gum.) 



O.'VK-PiNE. — Forests in which 50 percent or more of 

 the stand is hardwoods, usually upland oaks, but in 

 which southern pines make up 25-49 percent of the 

 stand. (Common associates include gum, hickory, 

 and yellow-poplar.) 



O.^K-HiCKORY. — Forests in which 50 percent or 

 more of the stand is upland oaks or hickory, singly or 

 in combination, except where pines comprise 25-49 

 percent in which case the stand would be classified 

 "oak-pine." (Common associates include yellow- 

 poplar, elm, maple, and black walnut.) 



Oak-gum-cypress. — Bottom-land forests in which 

 50 percent or more of the stand is tupelo, blackgum, 

 sweetgum, oaks, or baldcypress (southern cypress), 

 singly or in combination, except where pines com- 

 prise 25-49 percent in which case the stand would be 

 classified "oak-pine." (Common associates include 

 Cottonwood, willow, ash, elm, hackberry, and maple.) 



Elm-ash-cottonvvood. — -Forests in which 50 per- 

 cent or more of the stand is elm, ash, or Cottonwood, 

 singly or in combination. (Common associates in- 

 clude willow, sycamore, beech, and maple.) 



Maple-beech-birch. — Forests in which 50 percent 

 or more of the stand is maple, beech, or yellow birch, 

 singly or in combination. (Common associates in- 

 clude hemlock, elm, basswood, and white pine.) 



.Aspen-birch. — Forests in which 50 percent or more 

 of the stand is aspen, balsam poplar, paper birch, or 

 gray birch, singly or in combination. (Common as- 

 sociates include maple and balsam fir.) 



32 



Forest Resource Report No. 10, U. S. Department of Agriculture 



