THE SWISS METHOD OF REGULATING THE CUT IN PRACTICE 571 



Table 5. — Allowable Annual Cut Determined by the Swiss Method. 

 State Park, Door County, Wisconsin 



For Peninsula 



Bd. Ft. 



8,653 



108,149 



23,230 

 309,550 



56,810 



31,942 

 109,800 



45,160 

 131,386 



Z 



Bd. Ft. 



Yi 



Bd. Ft. 



81 



2,247 



272 



4,741 



844 



333 



1,376 



915 



1,941 



All trees under rotation size. 

 24,475 357 1,700 



8,230 



16^338 

 37,440 

 15,520 

 30,000 



Cutting 



cycle, 



years 



1.5 



6.4 



2.6 



7.3 



2.5 



5.2 



4.5 



11.5 



15.3 



2.9 



Allowable annual 



cut, by Swiss 



method. Bd. Ft. 



5,769 



16,900 



8,934 



43,531 



15,90/1 



9,284 



26,0002 



5,276 



10,584 



9,026 



Xi 

 Species Bd. Ft. 



Balsam 5,373 



White pine 14,706 



Red pine 8,679 



Hemlock 37,792 



Beech 21,617 



Birch^ 5,803 



Maple 22,995 



Basswood 3,034 



Oak 6,645 



Ash 1,555 



Popple^ 7,965 



' Reduced 30 per cent for defect. 



2 Reduced 20 per cent for defect. 



2 Volumes in cubic feet. 



With the various species in the forests on the Peninsula State Park, 

 very short cutting cycles were obtained in every case. A relatively 

 high increment and very Httle timber over the diameter limit is re- 

 sponsible for these conditions. Balsam wdth a cutting cycle of 1 . 5 

 years and oak with a cutting cycle of 15 years represent the extremes 

 here. 



Results from both tables show clearly that with the use of the 

 Swiss method, where a large amount of material under the diameter 

 limit exists, the tendency is toward a short cutting cycle; because the 

 large amount of timber in this class will be growing most rapidly and 

 hence furnishing a large amount of volume increment ; and that a large 

 amount of material in class "!'" in proportion to the amount in class 

 "X" will tend to lengthen the cutting cycle. 



Two extremes are shown in the data in Tables 4 and 5. While the 

 character of the size classes has caused wide variations in the length 

 of the cutting cycles for the two forests, they have had no similar in- 

 fluence on the allowable annual cuts, when determined by the method 

 under discussion. 



In the w^orking plan for the Catskill Tract, the results by the Swiss 

 method were checked with Von Mantel's formula and the area method. 

 For the Peninsula State Park land, results secured by Von Mantel's 

 formula, and Htifnagl's method, Var. I (suirmiation of increment), 

 were used as checks. The results secured and their averages are shown 

 in Tables 6 and 7. 



It will be noted that the Swiss method gives results in all cases 

 higher than the average. Inspection of the tables will show that the 

 average is pulled down by the results of Von Mantel's formula. 



