APPENDIX C 



the maintenance of an uninterrupted canopy up to the age of 

 maturity, and a careful execution of the regeneration cuttings spread 

 over a prolonged period of time, or else weeds will spring up, which 

 make regeneration very difficult, and at any rate expensive. 



On the whole, however, careful management is sure to be successful 

 in securing natural regeneration in all the areas pertaining to this 

 group ; for this purpose, as well as for the production of valuable 

 timber, a rotation of 120 years on an average is considered of 

 sufficient length. The length of the regeneration period differs 

 considerably in the different parts, varying on the whole from 30 

 to 50 years. 



~b. The, second group consists of woods growing on soils, which, even 

 under the most careful management, cannot be expected to produce 

 trees of first or even second quality. The trees here produced are 

 of such limited height growth, that the production of valuable timber 

 is out of the question. The woods are found in the upper, and here 

 and there in the lower part of the Bunter Sandstein area, where the 

 soil is covered with large masses of the debris of gravelly sandstone, 

 which is not easily decomposed, and where the slightest interruption 

 of the canopy overhead is followed by the appearance of a dense 

 growth of bilberry and heather. 



Nevertheless, these areas are capable of yielding timber of the 

 inferior classes, as well as firewood, and the returns which may 

 reasonably be expected from them, justify the application of a method 

 of treatment which, while avoiding any interruption in the canopy 

 and all expensive cultural operations, facilitates natural regeneration ; 

 in other words the treatment under the selection system by removing 

 all trees which are deteriorating or incapable of increasing in value. 

 It is difficult to fix any definite rotation, but it is estimated that the 

 trees will take about 150 years to reach maturity. 



The lowest quality limit for this group has been fixed at 7 cubic 

 feet increment per acre and year, while the upper limit is, as already 

 indicated, 43 cubic feet. The area comprised in this group amounts 

 to 12 per cent, of the total area. 



c. The third group comprises the so-called " Grinden," that is to 

 say the highest parts of the ridges, which are mostly level and have 

 a tendency to bogginess. They are covered by a dense growth of 

 bilberry and heather, and are incapable of producing more than a 

 stunted tree growth, which yields only a scanty quantity of firewood, 

 frequently not covering the price of preparing it ; hence financial 

 considerations are entirely out of the question, the areas being pro- 



