JACK PINE. 45 
TaBLE 31.—Stand of trees on jack pine land, site quality! in western Ontario—Average. 
of 10 acres. 
[From an article by L. M. Ellis in the Forestry Quarterly, March, 1911.] 
Jack Black | Balsam . ry A 
Diameter breast pine. spruce, fir. IDEA EE hers 
high. 
Average number of trees per acre. 
Inches. 
4 and under...... 8.2 124.4 44.1 0.8 20.8 0.4 
Dye eat is Bees Tae 8.8 41.7 Ds Pe 1.3 4.3 6 
Gere Aen oe oe 16.5 40. 4 au! 1.6 8.8 1.8 
eee Ree See ae 27.4 16. 4 BS 2.0 4.8 1.5 
RC Eee eee oe 32.8 14,1 Ae, 1.4 si) 1.3 
OEY Fo a se ee oe 16.8 183 nD, .6 4 25 
TQ) srt wens ie eee 9.6 CON) ia areas ee SS Ng Cae EN MD, 
Ue eee es Se Fe 322, CRO) Nie ROA Ge SM DG: hes Ne Ria anit if 
B2EGS Bid Dic a ee Th Gea ea Re Oa a eh i ae SLT Reet CA cp pea eotaaeen ayn! 
MSIE k See aye tena aS Seay ye ae Uae, Be tae ray a he leePasedoss beemeoSeuallacesocaacs 
Mopaleee etree 125.4 235.3 47.4 8.3 40.6 6.4 
iPeroanb. A oSaceee 27.0 | 50. 4 12 se 8.6 13, 
Trees 10 inches and over in diameter breast high. 
Total.........| 14.9 HOE Ov sleek ONG ea eg. 0.3 
Per cent...-------, 54.0 ASS Dean leceesys xpeba De (QR: Ree eet eaies 1.0 
1Includes 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 rarely reaches merchantable sizes, and never in such bodies as to make commercial 
exploitation profitable. 
TABLE 32.—Height and yield per acre of 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 Weise, converted into English measure and 
arranged by William Schlich, 1880. Based on 351 Scotch pine woods in Alsace, Baden, Bavaria, Prussia, 
and Saxony. Cubic feet reduced to cords by dividing by 90.] 
Final yield per acre of wood 3 inches 
Average height of stand. PANO care tC: 
Age. Quality of site. Quality of site. 
flys II. Te IDV Wo I. II. JOO IV. Vv. 
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) | 438.78 130500: 22.677 | 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 D2: 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 34.11 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.] 
Yield per period of years. Ngee Cumulative intermediate yield. 
Period ae 
of Quality of site. stand Quality of site. 
years 
e 
I. (Hs. || aia wid eg ee a ee an ee aa a ey: Vv 
Cords. | Cords. | Cords. | Cords. | Cords Cords. | Cords. | Cords. | Cords. | Cords 
0 to 25 1.41 0. 08 QOS Ree asec eee 25 2.17 0. 08 QNOSiy | Peel ere 
25 to 30 2. 09 . 56 -50 0.19 0.10 30 4.26 .63 .53 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 LEG 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 68 55 | 20.98 |} 13.5 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 U8) 1,40 . 63 70 | 31.16 | 22.61 | 16.84 9.80 4,41 
