APPENDIX CRITERIA FOR RATING PRODUCTIVITY 



687 



Table 97.- — Percentage of mean annual growth at culmination attained at various ages, by forest type group and size class of 



products cut, Central Region 





Oak -hickory type group 



Loblolly-shortleaf pine 

 type group — shortleaf 





Excellent site hardwoods 



Good site hardwoods 



Medium and poor site hardwoods 



pine ' 



Age 

 (years) 



Oaks, 



etc 



Basswood, 

 etc.2 



Sweetgum, 

 elm 



Cot- 

 ton- 

 wood 3 



Basswood, 

 etc.< 



Oaks 



etc.s 



Black oak, 

 redcedar 



Scarlet 

 oak, etc' 



Other oaks 



Site index 60 



Site index 7ii 





Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



Saw- 

 tim- 

 ber 



Cord- 

 wood 



20 



Per- 

 cent 



Per- 

 cent 

 20 



45 

 70 

 85 

 95 

 98 

 100 



Per- 

 cent 



'"'36' 

 55 

 65 

 75 

 80 

 85 



Per- 

 cent 

 70 

 80 

 87 

 95 

 100 



Per- 

 cent 



30 

 45 

 60 

 70 

 80 



Per- 

 cent 

 70 

 90 

 95 

 98 

 100 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 

 60 

 75 

 85 

 90 

 95 

 99 

 100 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 



Per- 

 cent 

 50 

 75 

 93 

 98 

 100 



Per- 

 cent 



""'46' 

 60 

 80 

 92 

 100 



Per- 

 cent 

 60 



25.. . 





40 

 60 

 85 

 100 



'"'46' 

 50 

 60 

 70 

 80 



'""46" 



45 

 60 

 75 

 95 

 98 

 100 



""io 



60 

 75 



40 

 60 

 85 

 95 

 100 



"""30" 

 60 

 80 

 90 



40 

 60 

 85 

 95 

 100 









80 



30 







40 

 70 

 90 

 95 

 100 



'""46' 

 63 

 77 

 89 

 96 

 100 



95 



35 





98 



40 



45 



15 

 30 

 45 



100 



50 









55 













60 



75 

 85 

 95 

 100 





90 

 95 

 100 





90 

 95 

 100 







85 

 95 

 100 





70 

 85 

 96 

 100 





90 

 100 





100 





30 

 55 

 75 

 95 

 100 











70 . 













80 























90 



























100 .. 





























































1 















1 Oaks, sugar maple, beech, walnut, and hickory. 



- Basswood, yellow-poplar, ash, red maple, sycamore. 



3 No felling-age factors were recogni7ed for cnrdwood products because of the 

 very early growth culmination of cottonwood for this class of material in the 

 region. 



STANDARDS FOR THE PLAINS 

 REGION 



Lake States criteria were used in the survey of 

 North Dakota, and criteria of the West Gulf 

 Region were appUed in the Plains parts of Okla- 

 homa and Texas. The standards given in the 

 following summary were used in South Dakota, 

 Nebraska, and Kansas. For these States, the 

 point system of sampling developed for the West 

 was used. 



Forest Type Groups 



Two forest type groups were recognized: 



Oak-hickory 

 Elm-ash-cottonwood 

 Cottonwood type 



The productivity standards for the oak-hickory 

 and the elm-ash-cottonwood type groups were 

 identical, but they differed for the cottonwood 

 type. 



Species Classification 



The following species classification was used for 

 all types: 



Desirable Species 



Ash 



Hackberry (acceptable in 



Kansas) 

 Oak, bur 

 Oak, chestnut 

 Oak, red 

 Walnut, black 



Acceptable Species 

 Basswood 

 Cottonwood (desirable 



cottonwood type) 

 Coffeetree, Kentucky 

 Elms 

 Hickories 

 Maple, red 

 Mulberry, red 

 Redcedar 



' Basswood, yellow-poplar, ash, red maple, sycamore, elm. 

 s Oaks and species other than those listed in 4. 

 « Scarlet oak and hickory in Kentucky. 



' For hardwood species associated with the pine type, appropriate hard- 

 wood standards were used. 



Existing Stocking 



Table 98 shows the standards used to determine 

 existing stocking at each sample point. Seedlings, 

 saplings, and, in some instances, poles were 

 counted if they fell within 1-, 2-, or 4-milacre 

 circular plots, as indicated in the table. Larger 

 trees were counted if they occurred within the 

 maximum distance from the point indicated for 

 each d b. h. class in the table. 



Prospective Stocking 



Cutover bottom lands and mixed hardwoods 

 were considered capable of restocking fully if 

 prospective reproduction would be free to grow 

 and the area was not subject to damage by fire or 

 grazing. Under less favorable conditions, the 

 prospective-stocking rating was based on seed 

 source, expected sprouting, amount of area 

 occupied by slash, grass, brush, culls, etc., and 

 damage by grazing or fire. 



If 50 percent of the 4-milacre quadrat surround- 

 ing the point was free of brush, rock, etc., and if 

 there was an adequate seed source, the point was 

 considered prospectively stocked provided there 

 was no evidence of grazing within the past 5 years. 

 An adequate seed source was considered to be one 

 or more desirable seed trees not more than 2 

 chains from the point for heavy-seeded species or 

 5 chains from the point for light-seeded species. 

 If there was a stump of 4 inches or less capable of 

 producing sprouts within 7K feet of the point and 



