BILLION 



80AR0-FEET 



M 



Miscellaneous 

 hardwoods 



Cottonwood- 

 aspen 



Miscellaneous 

 softwoods 



Pines, spruces 



1936 



1953 



Figure 20. — Volume of live sawtimber on commercial joreU land by 

 major species groups, 79.36 and 1953. 



BOARD-FEET SAWTIMBER 



/ 

 / 

 / 

 / / 

 / / 

 / / 





















•:•:• 



•!•!•!• 



•'.•y.r 



•'.•'.' 



•M*:* 



•:•:•> 



bul 



t^'^ 



iVftiii 



/ 



/ 



Aspen 



Mixed 

 hardwoods 



vX'l-XvIvX Softwoods 



MILLION ^^*^t.,,».« f...^^ ^,, 



CUBIC FEET GROWING STOCK 







y 



y 

 y 

 y 





Aspen 





--"-' 







Mixed 





hardwoods 























'.''.''.''.'\''.'',w','','\ 



Softwoods 





ulil^ 







1936 



1953 



Figure 21. — Comparison oj annual net growth for sawtimber and all 

 growing stock, 7936 and 7953. 



Minnesota's Forest Resources 



455115—58 4 



1,000 



800 



600 



400 



200 





 600 



500 



400 



300 



SAWTIMBER 



^ 200 



100 



GROWING STOCK 



ALL SPECIES SOFTWOODS HARDWOODS 

 ^^^ Net growth 



Mortality 



Figure 22. — Annual mortality and net growth Jor sawtimber and all 

 growing stock. 



Fire, which in earlier years was one of the leading 

 destroyers of timber, now has been brought under 

 better control (fig. 23). The average annual acreage 

 burned in Minnesota for 1931-35 was 476,070 acres, 

 while for 1948-52 it was 103,230 acres. A program for 

 educating the public to the wanton waste in wild- 

 fires, together with improved organization for fire 

 protection and suppression, has accomplished the 

 reduction. 



Windstorms, disease, fires, and insects not only 

 kill many trees but they lower the quality of the 

 remaining trees and gradually render them unfit for 

 commercial use. These losses can be reduced 

 greatly by improved forest management and timely 

 utilization. 



21 



