Iable 30.- 



-AUowablc annual cut from Lake States forests. 

 1951-60, by ownership class 



ALL OWNERS 



GROWTH 



ALLOWABLE CUT 



All timbe 



^3\v timber 

















State 



All 

 species 



Soft- 

 woods 



Hard- 

 woods 



All 

 species 



Soft- 

 woods 



Hard- 

 woods 



Minnesota _ 



Wisconsin. 



Million 

 cubic 

 feel 



230 

 215 



275 



Million 

 cubic 

 feet 



SO 

 25 

 75 



Million 

 cubic 

 feet 



150 

 190 

 200 



Million 



board 



feet 



300 

 380 

 520 



Million 

 board 

 feet 



110 

 60 

 130 



Million 

 board 

 feet 



190 

 320 





390 







Region total 



720 



180 



540 



1,200 



300 



900 







PUBLIC OWNERS 





140 

 45 

 75 



55 

 10 

 15 



85 

 35 

 60 



170 

 60 

 70 



70 

 15 

 15 



100 



Wisconsin 



4i 



Michigan _ 



55 





260 



80 



180 



300 



100 



200 







PRIVATE OWNERS 



Minnesota _ 



Wisconsin...- _ 



90 

 170 

 200 



25 

 15 

 60 



65 

 155 

 140 



130 

 320 

 450 



40 

 45 

 115 



90 



275 

 335 









460 



100 



360 



900 



200 



700 







cubic lecl wiili 1,200 million board ieet ot sawlog 

 material— significant differences need to be recog- 

 nized. 



The bulk of the growth is on young thrifty trees 

 just reaching merchantable size, whereas more of 

 the allowable cut is in mature and overmature 

 timber. Only about 15 percent of the cubic-foot 

 growth is in saw-timber stands, while 46 percent of 

 the proposed cut is from such stands. As regards 

 sawlog material, 73 percent of the proposed cut 

 should come from saw-timber stands notwithstand- 

 ing the fact that annual growth is less than half 

 this quantity (fig. 35). 



Net growth, by definition, is merchantable volimie 

 being added each year to the primary growing 

 stock. Allowable cut, on the other hand, includes 

 some material which soon would be taken out as 

 mortality if not harvested at the right time. The 

 part of the allowable cut expected to be obtained in 

 the form of thinnings and improvement cuttings 

 which do not detract from growth or inventory 

 amounts to about one-third of the proposed cubic- 

 foot cut and one-fourth of the saw-timber cut (fig. 

 3(i). 



ALLOW 

 CUT 



100 

 90 



eo 



70 



60 



U 50 

 a. 



40 

 30 

 20 

 10 







RESTOCKING 



AND 



SAPLING 



POLE 

 TIMBER 



SAW 

 TIMBER 



RESTOCKING 



AND 



SAPLING 



POLE 

 TIMBER 



ALL TIMBER 



SAW TIMBER 



F.<;URE 'ib.— Comparison of groifth and alhra'ablc rut -.rilli 

 respect to stand class where reported. 



GROWTH 



ALLOWABLE CUT 



ALLOW 



GR CUT 



90 — 

 80 — 

 70 



(.60 



ADDED TO 



PRIMARY 



GROWING 



STOCK 



TAKEN FROM 



PRIMARY 



GROWING 



STOCK 



SALVAGE, 



THINNING, 



MPROVEMENT 



CUTTING 



ALL TIMBER 



SAW TIMBER 



Figure 36.—Coml>arison of grozcth and allowable cut xrilh 

 respect to effect on primary growing stock. 



Because of tliese differences, the proposed allow- 

 able cut can be taken each year from the less pro- 

 ductive elements of the stand while the annual 

 growth will accumulate and gradually build up the 

 primary groAving stock for larger future yields. 



Drain in Relation to Growth and 

 Allowable Cut 



Total drain in cubic feet, all species combined, 

 was some\vhat less than growth and allowable cut 

 during the fairly representative year 1948. How- 

 ever, cubic-foot drain on softwood species was 

 greater than the recommended quantity and if con- 

 tinued \\ill tend to reduce annual "roA\th of these 



42 



Forest Resource Report No. 1. U. S. Depiirl moil of .-ffn^ru iillure 



