42 WORKING PLAN FOR FOREST LANDS NEAR PINE BLUFF, ARK. 



EFFECT OF FIRE PROTECTION UPON FUTURE YIELDS. 



An important conclusion follows. The fires which have repeatedly 

 swept the tract have reduced the proportion of pine trees under 22 

 inches now standing. If the forest were normal — that is, if all age 

 classes were present in sufficient amounts to maintain the present stand 

 of mature timber in years to come — equal cuts could be obtained in 

 much shorter periods than are now necessary, and probably twenty- 

 five years would produce a second crop equal to the first, In that case 

 a total area of 170,000 acres would suffice for a sustained yield equal 

 to the present annual consumption instead of the much larger area now 

 required. 



SUSTAINED ANNUAL YIELD OF THE FOREST. 



The sustained annual yield which can be obtained from the forest is 

 given in the following table. It shows the annual merchantable cut 

 of pine per acre, the area to be lumbered annually, the total annual 

 cut, and the time required for a second cut equal to the first, for the 

 diameter limits of 12, 14, 16, 18, and 20 inches. 



Table No. 13. — Sustained annual yield of merchantable pine in hoard feet, area to be 

 lumbered annually, and time required to cut over tract. 



Cutting 



limit, 



diameter 



breast high, 



Inches. 



12 

 14 



it; 



18 

 20 



Area to be 

 lumbered 

 annuallv. 



Annual 



cut per 



acre. 



Acres. > Boardfeet. 



2,380 

 2,439 

 2, 439 



2. MSI I 



2,380 



6,067 

 5, 845 

 5, 597 

 5,130 



4, 561 



SUSTAINED ANNUAL YIELD IN RELATION TO THE PRESENT 



CAPACITY OF THE MILL. 



The Sawyer & Austin Lumber Company own and operate a mill with 

 an annual capacity of 40.000,000 board feet. The present tract of 

 100,000 acres, cutting to a diameter limit of 12 inches, can supply con- 

 tinuously about 14,500,000 feet per year. The following table shows, 

 approximately, the forest area which would be necessary to produce a 

 sustained annual yield of 40,000,000 board feet per year. It estimates 

 for the several diameter limits the annual cut per acre, the area to be 

 lumbered annually, the time required to cut over the present tract, and 

 that required for a second cut equal to the first, 



