16 KERRY WOODS. 



GROUP L 6 . 



Area, o'2 acre. Elevation, 1,435 feet. Age, 20 years. 

 Aspect N.N.W. Slope gentle. Soil as in Group L 5 . 

 Dominant trees per acre (of mean diameter 47 in.) 670 

 Minor ( 2-5 ) 65 



Total 735 trees per acre 

 No sample tree felled. Average height of larch 22 feet. 



Volume per acre = - . X22xo'5i2 = 9io cub. feet approx. 



. 



Also present 250 spruce, no Scotch pines, 45 silver firs and 

 55 Corsican pines per acre. These species show the same relative 

 development as in Group L 5 . 



A comparison of the groups (see p. 15) shows that L 1? L 2 , L 3 

 are of the same age, while L 4 , L 5 , and L 6 are younger, L 5 and L 6 

 being also of equal age. Only the first three groups therefore 

 may be strictly compared. From the height-growth curves (see 

 p. 20) it is easily possible to predict with fair accuracy the probable 

 height and volume of all groups at the age of the oldest, viz. 

 23 years. 



This has been done and the results graphically represented in 

 the accompanying diagram (p. 17). The broken lines indicate 

 a change in the age of the groups. The volume falls off gradually 

 on the steep slopes ascending to Group L 4 , after which the fall 

 is very rapid. This rapid diminution in volume is obviously 

 connected in an intimate way with the local topography. Groups 

 Lj to L 4 lie on a steep slope under as good conditions of shelter 

 as it is possible to obtain at the given elevations. Above Group 

 L 4 (1,250 feet), however, the slope becomes much gentler and 

 the two remaining groups are somewhat exposed to cross winds, 

 notwithstanding the fact that Kerry Hill rises 120 feet higher 

 immediately to the windward. 



The heights and diameters fall off in a very similar way to the 

 volumes, with the exception of Group L 4 , which shows slightly 

 better growth than Group L 3 at a lower elevation. 



If the density of stocking were uniform throughout, the 

 correspondence of the volume, height, and diameter, curves would 

 probably be still more marked. 



The development of Group Lj is almost as good as the larch 

 attains in this country the average height growth of the best 

 trees being 2 feet per year for 23 years. In fact, so rapid has 

 been the growth of the larch in Groups L lf L 2 , L 3 , and L 4 that 

 only a tree here and there out of the other conifers which formed 

 three-quarters of the original crop has survived. The variations 

 in the number of survivors in these groups are probably due only 

 to accidental causes. 



