JACK PINE. 



45 



T.\BLE 31. — Stand of trees on jack pine land, site quality ' in ivestcrn Ontario — Average 



of 10 acres. 



[From an article by L. M. Ellis in the Forestry Quarterly, March, 1911.) 



Diameter breast 

 high. 



Jack 

 pine. 



Black 

 spruce. 



Balsam 

 fir. 



Larch. 



Birch. 



Aspen. 





Average number of trees per acre. 





Inches. 



4 and under 



5 



8.2 

 8.8 

 11). 5 

 27.4 

 32.8 

 16.8 

 9.6 

 3.2 

 1.6 

 .5 



124.4 

 41.7 

 40.4 

 16. 4 

 14.1 

 12.3 

 9.0 

 3.0 



44.1 

 2.2 

 .4 

 .3 

 .2 

 .2 



0.8 



1.3 



1.6 



2.0 



1.4 



.6 



.3 



.2 



.1 



20.8 

 4.3 



8.8 



4.8 



1.5 



.4 



0.4 



.6 



1.8 



1.5 



1.3 



.5 



.2 



.1 



6 



7 



8 



9 



10 



11 







12 







13 . ... 









1 1 



Total 









125.4 

 27.0 



235. 3 

 50.4 



47.4 1 8.3 

 11.2 15 



40.6 

 8.6 



6.4 

 1.3 



T'er cent 







Tr 



ecs 10 inch 



es and over in diameter breast high. 





Total 



14.9 

 54.0 



12.0 

 43.0 





O.G 

 2.0 





0.3 

 1.0 



Per cent 













• Includes higher hills and ridges, with scanty soil and lowlands bordering muskegs. In northern 

 Manitoba and northern Ontario the largest part of the interior regions is occupied by this type, on 

 which jack pine raiely reaches merchantable sizes, and never in such bodies as to make commercial 

 exploitation ijrofitable. 



Table 32. — Height and. yield jper acre oj managed or normal stands of Scotch pine (Pinus 

 sylvestris) on different qualities of site at different ages. 



[From '• Yield Tables for the Scotch Pine," by Wilhelm "Weiso, converted into English measure and 

 arranged by William Schlich, ISSO. Based on 351 Scotch pine woods in Alsace, Baden, Bavaria, Prussia, 

 and Saxony. Cubic feet reduced to cords by dividing by 90.] 



Age. 



Average height of stand. 



Final 



yield per acre of wood 3 

 and over in diameter. 



inches 



Quality of site. 



Quality of site. 



I. 



II. 



III. 



IV. 



V. 



I. 



II. 



III. 



IV. 



V. 



Years. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Cords. 



Cords. 



Cords. 



Cords. 



Cords. 



25 



31 



25 



21 



18 



15 



16.22 



5. 56 



3.78 



1.89 



1.56 



30 



38 



31 



26 



22 



19 



24.56 



13.00 



9.22 



4.89 



4.00 



35 



45 



36 



30 



26 



22 



34.00 



23.78 



16.00 



9.89 



6.78 



40 



51 



41 



35 



31 



25 



43.00 



31.44 



21.89 



14.33 



10.00 



45 



58 



46 



39 



34 



28 



50.00 



38.56 



26.22 



18.78 



13.00 



50 



64 



51 



43 



37 



31 



56.22 



43. 78 



30.00 



22.67 



15.89 



55 



68 



55 



47 



40 



33 



61.56 



48.22 



33. 44 



26. 00 ■ 



18.44 



60 



72 



60 



51 



42 



35 



66.89 



52.11 



36.67 



29.00 



20.78 



65 



76 



64 



54 



45 



37 



71.44 



55. 44 



39.67 



31.89 



23.00 



70 



80 



67 



57 



47 



39 



75.44 



58.33 



42. 44 



31. 11 



24.89 



Table 33. — Intermediate returns from thinnings in normal stands of Scotch pine on 



different qualities of site at different ages. 



[From same publication as Table 32.] 







i'icld per period of years. 







Cumulative intermediate vield. | 



Period 

 of 









Age of 

 stand 









Quality of site. 





Quality of site. 





years. 









years. 







I. 



II. 



III. 1 IV. 



V. 



I. 



II. 



III. 



IV. 



V. 





Cords. 



Cords. 



Cords. 



Cords. 



Cords. 





Cords. 



Cords. 



Cords. 



Cords. 



Cords. 



20 to 25 

 25 to 30 



1.41 

 2.09 



0.08 

 .56 



0.03 

 .50 







25 

 30 



2.17 

 4.26 



0.08 

 .63 



0.03 

 ..53 







0.19 



0.10 



0.19 



0.10 



30 to 35 



2.81 



1.50 



1.34 



.52 



.24 



35 



7.07 



2.13 



1.88 



.71 



.34 



35 to 40 



3.28 



2.42 



1.87 



.94 



.36 



40 



10.34 



4.56 



3.74 



1.66 



.70 



40 to 45 



3.49 



2.81 



2.19 



1.16 



.52 



45 



13.83 



7.37 



5.93 



2.81 



1.22 



45 to 50 



3.51 



3.01 



2.29 



1.27 



.61 



50 



17.34 



10.38 



8.22 



4.08 



1.83 



50 to 55 



3.63 



3.17 



2.33 



1.42 



.08 



55 



20.98 



13.54 



10.56 



5.50 



2.51 



55 to 60 



3.47 



3.11 



2.26 



1.42 



.63 



60 



24.44 



16.66 



12.81 



6.92 



3.14 



60 to 65 



3.41 



3.03 



2.04 



1.48 



.63 



65 



27.86 



19.69 



14.86 



8.40 



3.78 



65 to 70 



3.30 



2.92 



1.99 



1.40 



.63 



70 



31.16 



22.61 



16.84 



9.80 



4.41 



