68S 



TIMBER RESOURCES FOR AMERICA'S FUTURE 



Table 98. — Trees per acre and maximum distance 

 from point required for full fttocking, by tree size, 

 forest type group and type, Plains Region 



no evidence of recent grazing or burning, the point 

 was considered potentially stocked. 



Effect of Felling Age 



Whenever significant clear cuttings were en- 

 countered in stands below rotation age, appropri- 

 ate adjustment factors were recorded according 

 to the standards in table 99. 



STANDARDS FOR THE SOUTH AT- 

 LANTIC, SOUTHEAST, AND WEST 

 GULF REGIONS 



Forest Type Groups 



The following type groups were recognized: 



Loblolly-shortleaf pine (including Virginia pine) 



Longleaf-slash pine 



Oak-hickory 



Oak-gum-cypress 



Oak-pine (includes small area of spruce-fir) 



Species Classification 



The classification of species for the various forest 

 type groups is shown in table 100. 



Existing Stockbvg 



A composite table for all forest types was used 

 in the southern TRE regions for determining 

 existing stocking. The corresponding density 

 standard this represents is shown in table 101. 



Table 99. — Percentage of mean annual growth at culmination attained at various ages, by forest type group 



and, type, and size class of products cut. Plains Region 



Diameter 

 breast 



Oak-hickory and 



elm-ash-cottonwood 



type groups 



Cottonwood type 



high 



(inches) 



Trees 

 per 

 acre 



Maximum 



distance 



from point 



Trees 

 per 

 acre 



Maximum 



distance 



from point 



Reproduction _ 

 2 



Number 



1,000 



800 



600 

 400 



240 

 155 



115 

 90 



70 

 55 



45 

 38 



32 



27 



23 



20 



Feet 

 3. 7 

 4 1 



48 

 5. 9 



7. 6 

 9. 5 



11.0 

 12.4 



14 1 

 15. 9 



17. 8 



19. 1 



20. 8 

 22. 7 



24 6 

 26.3 



Number 



1,000 



800 



600 

 450 



280 

 190 



140 

 105 



80 

 66 



55 



45 



38 

 33 



28 

 24 



21 

 19 

 17 



Feet 



3. 7 



4. 1 



4 



6 



8 _ ,_ 



48 

 5. 6 



7. 



10 



12 



14 



16 



18 



20 



22 



24 



26 



28 



30 



32 



8. 6 



9. 9 

 11.5 



13. 2 

 14 5 



15. 9 

 17. 8 



19. 1 

 20.5 



22. 3 

 24 



25. 7 



34.. 







27 



36+ 







28 6 





Oak-hickor\' and elm-ash-cottonwood 

 type groups 



Cottonwood type ' 



Age (years) 



Good site 2 



Poor site ' 



Cottonwood 



Other species 





Saw- 

 timber 



Cordwood 



Saw- 

 timber 



Cordwood 



Saw- 

 timber 



Cordwood 



Saw- 

 timber 



Cordwood 



20 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 

 20 

 60 

 80 

 95 

 100 



Percent 



Percent 



25 





45 

 60 

 75 

 95 

 98 

 100 











43 



30 







40 

 70 

 90 



45 

 75 

 95 





69 



35... 







85 



40 







38 

 48 

 58 

 73 

 84 

 91 

 95 

 97 

 98 

 100 



95 



45... 





--- 



55 



75 



95 



100 



95 99 



100 



50 _ . . 



40 

 70 

 85 

 96 

 100 



100 



100 







60 





70 













80 













90 











100 













110 















120 

































• For sites where total height of mature trees was more 

 than 90 feet. For sites where total height of mature trees 

 was below 90 feet, standards for the oak-hickory and elm- 

 ash-cottonwood type groups were used. 



= Good sites = total height of mature trees 70 feet or 

 more. 



' Poor sites= total height of mature trees less than 70 

 feet. 



