72 THE SHELTER WOOD METHOD 



and preparatory cuttings over additional territory. (See 

 Fig. 2 2 and Fig. 23.) 



At intervals additional successive cuttings are made stead- 

 ily broadening the area cut over until finally the various 

 groups which served as original starting points are expanded 

 until they merge one with the other and the entire stand is 

 reproduced. (See Fig. 24.) 



The period allotted to reproduction cuttings under the 

 group method may be of the same length as that used in uni- 

 form and strip shelterwood, but since advance reproduction 

 (often 20 to 30 years old) is already present when repro- 

 duction cuttings commence, the range in age between indi- 

 vidual trees of the new stand is apt to be wider than in the 

 two latter methods. The stand can in most cases still be 

 classed as evenaged. 



Group shelterwood, when employed on a long rotation with 

 a correspondingly long period of regeneration, approaches in 

 form of forest that produced under the selection method, as 

 will be better understood after consideration of the chapter on 

 selection. 



Extensive versus Intensive Application — The discussion of 

 the shelterwood method has up to this point related particu- 

 larly to its intensive application. 



Shelterwood, requiring as it does several cuttings on the 

 same area within a relatively short period, inherently is best 

 adapted for employment under conditions allowing intensive 

 management. Only in regions where the market allows sale 

 of lower grade products, such as cordwood, and where a per- 

 manent road system exists, that permits easy access to all 

 parts of the forest, can the shelterwood method be applied 

 intensively. 



The method meets so well the silvical requirements for re- 

 production of several important species that modifications to 



