A FOREST WORKING PLAN. 



42 1 



TABLE XXX.— ESTIMATE OF FUTURE YIELD OF SPRUCE ON MERCHANTABLE 



AREA IN TOWNSHIPS 5, 6 AND 41. 



Volume in Markets by Standard Rule. 



Township 5. 







Average Cut Per Acre Obtainable at the End of io-Yeak Periods 



Interval 



Cutting limit: 



Average 





in Standards 







required 



diameter 



present yield 

 per acre. 











between 



breasthigh. 



10 



20 



3° 



40 



5" 



equal cuts. 



Inches. 



Standards. 













Years. 



10 



23.08 



2.70 



5-66 



11 .72 



19-35 



26.l8 



46 



12 



18.76 



2.72 



8.34 



15-15 



24-43 



39-19 



34 



14 



I5.36 



2-54 



H-33 



19-75 



3I-I3 



44-71 



25 









Township 6. 









10 



25-36 



2.52 



6.09 



1 1. 71 



17.16 



24.76 



5i 



12 



21.00 



2.76 



8.29 



14-74 



25.12 



39-04 



36 



14 



16.4I 



2.84 



12.28 



20.87 



31-97 



47-03 



25 









Township 41. 









10 



32.37 



2-44 



5-99 



12.37 



20.29 



27-34 



56 



12 



27.58 



2. 9 8 



9.00 



15-46 



26.13 



41.91 



4i 



14 



22.65 



3-37 



13.86 



23.44 



34 -90 



50.52 



29 



The following table shows in percentages of the present cut for the three 

 diameter limits what the future cuts would be in from ten to fifty years: 



TABLE XXXI.- ESTIMATE OF FUTURE YIELD OF SPRUCE ON MERCHANTABLE 



AREA IN TOWNSHIPS 5, 6 AND 41. 

 Township 5. 



Cutting limit: 

 diameter 



Average 



present yield 



per acre. 



Average C 



jt Per Acre Obtainable at the End of io-Y 

 Expressed in Percentages of Present Yield 



ear Periods 



Interval 



required 



between 



equal cuts. 



breasthigh. 



10 



20 



.S° 



40 



5° 



Inches. 



Standards 













Years. 



10 



23.08 



11. 7 



24.4 



50.6 



83.6 



H3-5 



46 



12 



18.76 



14-5 



44.6 



80.9 



130.5 



209.9 



34 



14 



I5.36 



17-5 



78.I 



136. 1 



214-5 



308.1 



25 . 









Township 6. 









10 



25.36 



9.6 



23-3 



44.8 



65.7 



94-8 



5i 



12 



21.00 



12.7 



38.2 



67.8 



H5-6 



179-7 



36 



14 



16.41 



16.7 



72.2 



122.6 



187.8 



276.3 



25 









Township 41. 









10 



32.37 



7.6 



18.7 



38.7 



63-5 



85.5 



76 



12 



27.58 



10.9 



33- 1 



56.9 



96.1 



I54-I 



4i 



14 



22.65 



15-5 



63.8 



107.9 



160.6 



232.5 



29 



