570 Forestry Quarterly 



Every ten years the working plan must be revised and each revi- 

 sion costs approximately 3 cents per acre. In 1765 A. D. an 

 excellent survey of the whole of Russia was made and the work- 

 ing plan maps are based on this. Very fine boundary maps have 

 been constructed for most of the national forests, 



A good average size for national forests in Central Russia is 

 7,500 to 12,000 acres, while in Northern Russia they approximate 

 those of this country. 



In Central Russia where subdivisions exist a compartment 

 contains 100 desiatins* or 270 acres, and on the best National 

 Forests only 25 desiatins or G7 acres, while in the North of 

 Russia it often contains 64 square kilometers (15,810 acres). 



For working plans, the area is carefully mapped and sample 

 plots accurately measured in order to determine the actual con- 

 tents of the stand. Sample trees are felled and measured, and the 

 volume of the stand is computed by the Urich method. 



In Northern Russia the selection system is used for Scotch 

 pine, while in Eastern and Central Russia the strip system, 

 followed by artificial regeneration, is applied to the same species. 

 Economic conditions are the reason for this difference. Northern 

 Russia being very thinly populated and the timber values are 

 relatively low, hence a more intensive and consequently more 

 costly system of management cannot be profitably applied. On a 

 good quality of locality the stand (shelterwood-compartment) 

 method with cuttings at fifteen year intervals is used. For 

 spruce in the north, from St. Petersburg on, the shelterwood 

 system, with two or three fellings instead of the four called 

 for in the complete system, is used, if the seed years are poor 

 and if there is a ground cover of dense grass, it is necessary 

 to aid natural reproduction by planting. 



The corridor system devised by Mr. Molchanofif for use in 

 the State of Tula in Central Russia has been very successfully 

 applied to oak. This is used where a mixed type of young 

 aspen, maple, ash and poplar occurs. All the trees are cut out 

 in narrow strips ("corridors") three and a half feet wide, with 

 intervening strips fifteen feet wide, in which the stand is left 

 untouched. The corridors are then planted or sown to oak. 

 The stand in the fifteen foot strips then acts as a nurse, cleaning 



* 1 desiatina=r2.7 acres. 



