70 THE SHELTERWOOD METHOD- 



The width of the strips depends upon the danger from 

 windfall and upon the extent to which side shade and con- 

 servation of soil moisture are desirable. 



Strips should rarely be less than loo feet in width, and if 

 wider than 500 to 800 feet lose the inherent characteristics 

 of a strip shelterwood cutting. 



The length of the period of regeneration remains the same 

 as under the uniform application of the method. If the strips 

 must be made narrow and the stand is a large one, it may be 

 necessary to establish several cutting series in order to com- 

 plete the reproduction cuttings within the allotted period. 

 For discussion of the use of several cutting series refer to clear- 

 cutting in strips on page 32. 



Strip shelterwood does not necessarily cause any greater 

 range of age between the individuals of the new stand than 

 does application uniformly over the entire area, since the 

 period of regeneration is the same in the two cases. The 

 differences in age are not noticeable because the average 

 ages of the trees on the strips first operated are greater than 

 those on the strips in which cuttings start later. The total 

 range of ages is so small as not to interfere with the evenaged 

 character of the stand. 



Wagfier's " Border Cuttings.^' — Wagner ^ developed in 

 practice on a forest in Wurtemberg a modification of the strip 

 shelterwood method which in this country has received the 

 name "Border Cuttings."^ Heralded as something quite 

 new in silviculture it reduces in the last analysis to strip 

 shelterwood with exceedingly narrow strips (less than 100 

 feet in width). 



Group Shelterwood Method. — Commonly in evenaged for- 

 ests, particularly in those which have undergone thinning or 

 had their regularity disturbed by natural agencies such as 

 wind, insects or fungi, it happens that when the beginning of 



