FIXF.D YSARI.Y CUT 141 



For this Volume Check, in using the Fixed Yearly Cut Method 

 of Regulation for the Selection forest, Hundeshagen's reasoning 

 appears quite sufficient. This, as modified by Von Mantel permits 

 the cut to take 2G/r every year. 



In our forest of 22000 acres, with a growing stock of 5000 

 cubic feet per acre or a total of 



5000 X 22000 no million cubic ft. of Growing Stock and a 

 rotation of 150 years (decided upon) we could cut 



2 X 110,000,000/150= 1,460,000 cu. ft. per year. 

 Since this 1,460,000 cu. ft. is cut on one-twentieth part of the town- 

 ship or noo acres, the cut per acre is 



1,460,060/1 100 or about 1300 cu. ft. per acre, actually cut over. 

 A simpler way is : Cut = 2G/r 20 per acre at each return. 

 This per acre and with above premises : 



2 X 5000/150 20 1300 cu. ft. 



With a twenty-year return then the cut takes 2O/r (2G) = 4o/r G. 

 With an ordinary rotation of 100 years this would mean about 40% 

 of the growing stock. From a silvicultural standpoint this would 

 be a very heavy cut, and for rotations of 100 years and less, a twenty 

 year return is too long except for pure stands of intolerants. With 

 a ten-year return and a cut of 20% a much better silviculture is 

 possible. The amount or proportion to take out at each return 

 depends on site, tolerance of species, market, etc. With intolerant 

 pine more must be cut to enable reproduction ; on poor sites less 

 should be cut to avoid soil deterioration ; with poor site and poor 

 market, good silviculture must be sacrificed and more taken to make 

 possible selling the stuff at all, etc. 



From the foregoing it is evident that in the Selection Forest, 

 Area Regulation is, of necessity, combined with a Volume Regula- 

 tion or Volume check. 



. This method of logging over a definite area, and covering a 

 property in a given time is perfectly practical and advisable. As in 

 all cases of Regulation the property should be examined from time 

 to time, preferably every ten years, and a plan adapted as the condi- 



