Periodical Literature 259 



the utilization of the stands to the time when they reach the age 

 of the rotation. Rotation means then the end of the regeneration 

 period, and at the same time of utihzation of the stand. The 

 regeneration period, which then is also the utilization period of 

 the stand, may be divided into "management periods," which are 

 best made equal in length to the age periods and to the usual 

 revision period. 



For instance, with a rotation of 120 years in age periods of 10 

 years and a regeneration period of 30 years, this would be divided 

 into three management periods. The budget calculation would 

 then be based upon the I management period (which is the same 

 as the tenth age period, 91-100 years), instead of the age of the 

 rotation. 



The expected yield of each of the stands of the regeneration 

 period is then calculated for and in the working plan allotted to 

 the management periods ; and there are added the correspond- 

 ing increments for the later periods, a 10-year addition to the II 

 period, a 20-year increment addition to the III period. Thus, 

 for each of the last three age periods the normal sustained yield 

 and proper felling budget is determined. In this way when 

 stands reach the tenth age period they begin to be utilizable with 

 a budget only figured for that period. When the stands reach the 

 101-110 age period they are utilizable to the extent of a different 

 yield portion, namely shortened by that used in the first ten years ; 

 and so in entering the third period again the budget for 111-120 

 year period is utilizable less the portions cut in the two preced- 

 ing periods. 



For the utilization of the portions utilizable in each period, of 

 course, the stands of all three periods are available, the three sets 

 of stands being under operation at the same time, and affording 

 freedom of movement with regard to the needs of regeneration. 



The author adds a plea for a rational management ledger and 

 management map, in which are recorded in detail the operations 

 in the woods, and gives hints how to do it. 



Wie kann die Jorslliche Ertragsberechnung zur Ermoglichung der Anpassung 

 der Etatsnutzungen an die waldbaulichen Erfordernisse gestaltet iverden? Allge- 

 meine Forst- und Jagdzeitung, May, 1914, pp. 153-159. 



