176 



THl- PRINCIPLES Ol HANDLING WOODLANDS 



lots as there are years in the rotation. If the trees are to 

 grow twenty years, there will then he twenty divisions, 

 one of which is cut each year. After the work has been 

 in operation one rotation, there are 20 ages represented, 

 and one lot is coming to the rotation age each year. If 

 the quality of site is about uniform over the whole for- 



Fig. 37. — Distribution of Annual Cutting Areas in a Forest Managed under 

 the Simple Coppice System on a Rotation of Twenty Years. A Com- 

 munal Forest in Northern Germany. 



est, these lots are made about equal in size. If there are 

 different types of land, with different qualities of site, 

 and hence with different yield capacities, the lots are 

 made somewhat larger on the poor soil than on the 

 good soil, so that the yield in material will be about 

 the same each year. The diagram above shows a 

 German communal forest divided into 20 annual cut- 

 ting areas. 



