SUGAR PINE. i 29. 
Table 20 shows maximum stands of sugar pine within the sugar 
pine-yellow pine type in three representative Sierra Nevada range 
localities, as well as the proportion of other species in mixture. 
The heaviest single acre estimate of which the Forest Service has 
a record is 192,000 feet b. m., which amounted to 75 per cent of the 
total estimate for the acre plot. Acres containing 75,000 to 150,000 
feet b. m. are frequently found within the maximum range of the 
species. The largest single tree measured by the Forest Service 
sealed 40,710 feet b. m. 
TaBLE 21.— Yellow pine type (quality IT). Yveld per acre and increment per acre per 
annum of all species. 
Incre- Incre- Tncre- 
Neo Yield | ment per fare Yield | ment per Ace Yield | ment per 
Ricans per acre. | acre per wee per acre. | acre per arses per acre. | acre per 
annum. annum. annum. 
Years. Bd. ft. Bd. ft. Years. Bd. ft. Bd. ft. Yearss Bd. ft. Bd. ft. 
10 55 5.5 150 15, 900 106 290 33, 200 114.5 
20 220 11 160 17, 900 112 300 33, 300 iil 
30 550 18 170 19, 900 117 310 33, 200 107 
40 1, 000 25 180 21, 900 122 320 33, 000 103 
50 1, 600 32 190 23, 800 125 330 -| 32,600 99 
60 2, 600 43 200 25, 600 128 340 32, 200 $4.5 
70 3, 500 59 210 27, 200 129.5 350 31, 700 90.5 
80 4, 600 57 220 28, 700 130.5 360 31,100 86.5 
90 5, 900 C6 230 29, 800 130 370 30, 500 82.5 
100 7,300 13 240 30, 900 129 380 29, 900 78.5 
110 8, 800 80 250 31, 700 127 390 29, 200 75 
120 10, 400 87 260 32, 300 124 400 28, 500 71.2 
130 12, 100 93 270 32, 800 121 
140 14, G00 100 280 33, 100 118 , 
TaBie 22.—Fir-sugar pine type (quality IT). Yveld per acre and increment per acre 
per annum of all species. 
( | 
| 
Tncre- Incre- | Incre- 
Yield | ment per i Yield | ment per Yield | ment per 
Age. Age. A Age. 
per acre. | acre per per acre. | acre per per acre. | acre per 
annum. annum. annum. 
Years. Bad. ft. Bad. ft. Years. Bd. ft. Ba. ft. Years. Bad. ft. Bd. ft. 
10 80 8 230 40, 500 176 450 88, 400 196.5 
20 300 15 240 43, 700 182 460 88, 700 193 
39 700 23 250 47, 000 188 470 88, 700 189 
40 1,390 32 250 50, 300 193. 5 480 88, 500 184 
50 2, 000 40 270 53, 600 198.5 480 88, 200 180 
60 2, 900 48 280 57, 000 203. 5 500 | 87, 700 W525 
70 3, 900 56 290 69, 200 207.5 510 87, 000 170.5 
80 5, 100 64 300 63, 500 PMA) 520 86, 200 165.5 
20 6, 500 72 310 66, 500 214.5 530 85, 200 161 
160 8, 000 80 320 69, 200 216 540 84, 100 155.5 
110 9, 600 87.5 330 71, 800 Nie 550 82, 800 150.5 
120 11, 400 95 340 74, 200 218 560 81, 500 145.5 
130 13, 400 103 350 76, 300 218 570 80, 100 140.5 
140 15, 500 ial 360 78, 300 217.5 580 78, 700 135.5 
150 17, 800 118.5 370 80, 100 216.5 590 77, 300 131 
160 29, 200 126 380 |. 81,700 215 600 75, 900 126.5 
170 22, 600 133 390 83, 200 21305 610 74, 500 122 
180 25, 200 140 400 84, 500 211.5 620 73, 100 1 
1S0 28, 000 147.5 410 85, 700 209 630 71, 600 113 
200 31, 000 155 420 86, 600 206 640 70, 060 109.5 
210 34, 000 162 430 87, 400 203 
220 37, 200 169 440 88, 000 260 
Since sugar pine never occurs in pure or even-aged stands, the 
problem of predicting the acreage yield at various ages is a complex 
one which has not as yet been satisfactorily solved. Tables 21 and 
22 indicate the probable yield of all species in the yellow pine and 
