JACK PINE. 



13 



Table 4 indicates the average dominant and the predominant 

 growth on jack-pine land of good quality in the northern part of the 

 Southern Peninsula of Michigan. 



Tables 5 and 6 indicate the development of jack pine in dense 

 stands on good sites in the southern part of the Upper Peninsula of 

 Michigan. 



Table 7 indicates the rate of growth on good sites in western 

 Ontario, a region very favorable to the growth of jack pine. 



Table 8 shows the growth on poorer soil in Manitoba. 



Tables 9 and 10, which are not comparable with Table 1, being 

 based on different data, show the average growth and yield at dif- 

 ferent ages of dense, even-aged, unmanaged stands of jack pine on 

 sandy soils in Hubbard County, Minn. These stands have been 

 more or less damaged at one time or another by ground fires which 

 were not sufficiently severe to kill many trees, but which without 

 doubt appreciably lessened the vitality and rate of growth of a large 

 number of them. 



Table 9.— Rate of growth and yield per acre of pure, even-aged, densely stocked stands of 

 jack pine in Ilubbard County, Minn. 



SITE QUALITY "GOOD." 





Trees per acre. 



Average. 



Age. 



Basal 

 area. 



D. 1). h. 



Domi- 

 nant 

 height. 



Yield 





Total. 



5 inches 

 and over. 



10 inches 

 and over. 



5 inches 

 and over. 



5 inches 

 and over. 



acre.i 



Years. 

 20 



Number. 

 1,120 

 839 

 072 

 565 

 485 

 432 

 398 

 374 

 358 

 345 

 332 



Number. 

 94 

 153 

 281 

 391 

 404 

 393 

 382 

 371 

 358 

 345 

 332 



Number. 



Sq.ft. 

 15 

 28 

 57 

 90 

 102 

 108 

 111 

 114 

 115 

 116 

 116 



Inches. 

 5.4 

 5.8 

 6.1 

 6.5 

 6.8 

 7.1 

 7.3 

 7.5 

 7.7 

 7.8 

 8.0 



Feet. 

 30 

 37 

 43 

 48 

 52 

 56 

 60 

 63 

 66 

 69 

 71 



Cu. ft. 

 730 



25 





1,090 



30 





1,630 



35 



40 



45 



7 

 26 

 39 

 45 

 48 

 51 

 53 

 53 



2,480 

 2,970 

 3 260 



50 



55 ; 



60 



65 



3,470 

 3,660 

 3,840 

 4,010 



70 



4, 180 



SITE QUALITY "POOR." 



25. 

 30. 

 35. 

 40. 

 45. 

 50. 

 55. 

 60. 

 65. 

 70. 



1,400 

 1,091 

 846 

 698 

 602 

 537 

 490 

 450 

 412 

 377 



71 

 138 

 203 

 279 

 330 

 360 

 373 

 376 

 374 

 364 





10 

 22 

 36 

 53 

 67 

 78 

 86 

 92 

 97 

 100 



5.1 

 5.4 

 5.7 

 5.9 

 6.1 

 6.3 

 6.5 

 6.7 

 6.9 

 7.1 



29 

 35 

 40 

 44 

 48 

 51 

 54 

 56 

 58 

 60 













6 

 17 



25 

 30 



660 

 930 

 1,250 

 1,590 

 1,900 

 2,180 

 2,430 

 2,660 

 2,870 

 3,080 



1 Total volume, including bark, of all trees 2 inches and over in diameter, breast high. 

 Based on 128 plots; area, 90.2 acres. Measurements by H. H. Chapman. 



