YIELD OF EVEN-AGED HARDWOOD STANDS. 



35 



convenience the yield tables are separated into general yield tables, 

 and yield tables for cord wood, lumber, ties, and poles. In the general 

 tables and those for cordwood, yields are shown for the oak-chestnut, 

 chestnut, and oak types. In the other tables figures are for chestnut 

 only, since yields in lumber and ties in the oak and oak-chestnut types 

 proved too few and irregular for accurate computation. The actua] 

 yields in lumber and ties of such normally stocked plots in these types 

 as were measured are given, however, in Tables 49, 50, 51, and 52 in 

 the Appendix. 



GENERAL. 



Tables 17-25. inclusive, show the approximate yield per acre in 

 cubic feet, for five-year periods, of average unmanaged stands of the 

 different types and quality classes. Together with the yield are 

 shown (1) the average height of the dominant or tallest trees in the 

 stand, since this is the basis of the distinction of quality classes; (2) 

 the average diameter of all trees above 2 inches in diameter at breast- 

 height ; (3) the total number of trees per acre over 2 inches in diam- 

 eter; and (4) the total basal area per acre, which determines whether 

 or not a stand is fully stocked. 



The yields in cubic feet for living trees were read from the curves 

 in figure 3. The individual plots were scaled by cubic-foot volumes. 

 To obtain the total yield per acre the volumes for merchantable dead 

 trees were scaled by a special table, averaged by a curve, and added 

 to the yield for living trees. 



Table 17. — Yield in cubic feet — chestnut type, quality I. 





Height 

 of domi- 

 nant 

 trees. 



Diameter 

 breast- 

 high of 

 average 

 tree. 



Number 

 of trees 

 per acre. 



Basal 



area per 



acre. 



Yield per acre. 



Age. 



Living 

 trees. 



Living 

 and mer- 

 chant- 

 able 

 dead 

 trees. 



Years. 

 15 



Feet. 

 38 

 50 



58 

 64 

 70 

 74 

 77 

 80 

 83 

 85 

 87 

 88 

 90 



Inches. 



3.2 



4.4 



5.4 



6.4 



7.3 



8.1 



8.9 



9.6 



10.3 



10.9 



11.6 



12.2 



12.8 



1,000 

 830 

 680 

 550 

 460 

 400 

 350 

 310 

 280 

 260 

 235 

 220 

 200 



Sq.ft. 



56 

 88 

 108 

 122 

 133 

 142 

 150 

 157 

 163 

 169 

 173 

 177 

 181 



Cu.jt. 

 1,090 

 1,660 

 2,310 

 2,960 

 3, 550 

 4,050 

 4,490 

 4,880 

 5,220 

 5,530 

 5,830 

 6,100 

 6,350 



Cu.ft. 

 1,150 



20 



1,750 



25 



2,420 



30 



3,100 



35 



3,680 



40 



4,220 



45 



4,700 



50 



5,150 





5,500 



CO 



5,800 



65 



6,070 



70 



6,320 



75 



6,530 







