janic or domestic livestock 



prcciable in some 



districts. To these can be addeil minor losses irom 

 sunscald, drought, trost cracking, snow breakage, etc. 



Potential Current (iroivfli 



It is not practicable to eliminate mortality trom a 

 forest area of such wide extent as that in the Lake 

 States. However, it would be feasible to reduce the 

 losses at least 25 percent through improved forest 

 management and better utilization. 



Such management and tuili/ation would include: 

 (1) extending logging operations into hitherto luicut 

 areas to salvage overmatiue timber now going to 

 waste, (2) engaging in frequent partial cuttings for 

 the purpose of salvaging recently killed timber, 

 anticipating imminent mortality, and stimulating 

 growth of remaining trees, (3) avoiding "high grad- 

 ing" operations, (4) improving protection from fires, 



1,600 



1,400 



1,200 - 



tfc 



ct 1,000 

 K 



800 - 



600 - 



400 - 



200 



- 













~ 



MORTALITY 





- 



'^Z/ SALVAGEABLE /// 



Y/////////// 









- 



////GROWTH '^Z// 



POTE 

 CUR 

 GRC 



NTIAL 



RENT 



WTH 





^^M 





' 



insects, and disease, (5) reducing pasturing (jf larm 

 woods, and ((i) clearing out undesirable trees which 

 hinder growth. 



By these measures, net growth could be increased 

 almost immediately to about 900 million cubic feet 

 instead of the present 720 million (figure 26). 

 Growth in board feet cotdd be 1.450 million instead 

 of the present 1.200 million. 



Potential Future Growth and Yields 



Continued good cutting practices and good pro- 

 tection combined with efforts to establish a better 

 distribution of stand classes, could increase growth 

 sufficiently to provide steadily increasing yields of 

 timber for industry and still leave a surplus to build 

 up growing stock. A rough estimate of the possible 

 course of fiuine yields is shown in table 20. A 

 comparison of total yield and total growth is given 

 in figtne 27. ■ 



Fu.um 'J.i}.—Putciiliiil current grouith as related tu uctunl net 

 growth and mortality. 



FiGURi'. 27.— Potent Iti I fiilure growtli and yield from natural 

 stands in lite Lake States, 1960-2050. 



Forest Resources of the Lake States Region 



29 



