Table 2.16 - Annual average and total accumulation of carbon in live trees on timberland in the Rocky Mountains, by forest type and productivity class, 1987
Net annual growth of
growing stock
Net annual growth of
solid wood
Forest type and
productivity class
Area of timberland Softwood Hardwood Softwood Hardwood Average carbon accumulation
in trees
Total carbon accumulation
in trees
(1,000 ac) (1,000,000 cu ft) (1,000,000 cu ft) (Lbs/ac) (1,000 metric tons)
Douglas-fir
85+ 2,904 168,981 1,258 338,586 2,494 1,770 2,332
50 to 85 5,619 195,445 2,746 422,290 5,372 1,146 2,920
20 to 50 4,779 94,485 2,103 201,373 4,184 646 1,401
Total 13,304 458,914 5,861 962,255 11,570 1,102 6,651
Ponderosa pine
85+ 769 39,381 499 75,638 987 1,322 461
50 to 85 1,951 61,456 1,440 126,019 3,218 878 777
20 to 50 10,995 238,838 1,358 497,095 2,745 604 3,011
Total 13,715 339,677 2,755 698,756 5,867 682 4,244
Western white pine
85 + 240 20,536 10 39,487 20 1,980 216
50 to 85 16 717 0 1,444 0 1,076 8
20 to 50 4 63 4 116 8 349 1
Total 260 21,317 14 41,048 28 1,900 224
Fir-spruce
85 + 2,899 178,461 1,935 348,689 3,579 1,356 1,783
50 to 85 5,046 165,434 4,133 331,900 9,275 755 1,728
20 to 50 3,063 62,213 2,746 123,021 5,414 469 651
Total 11,010 406,107 8,476 803,609 17,593 833 4,158
Hemlock-Sitka spruce
85 + 1,243 96,802 451 181,538 893 2,032 1,146
50 to 85 226 13,563 7 26,282 14 1,610 165
20 to 50 19 814 0 1,640 0 1,186 10
Total 1,488 111,181 458 209,465 907 1,958 1,321
Larch
85 + 1,212 100,342 274 202,238 543 2,714 1,492
50 to 85 506 20,938 36 46,383 71 1,489 342
20 to 50 31 1,029 0 2,196 0 1,147 16
Total 1,749 122,308 300 250,815 594 2,332 1,850
Lodgepole pine
85 + 1,276 98,402 586 208,063 1,158 2,211 1,280
50 to 85 2,983 149,008 787 323,540 1,586 1,470 1,989
20 to 50 5,137 163,047 1,910 330,325 3,857 877 2,043
Total 9,396 410,302 3,282 861,646 6,599 1,246 5,311
Redwood
85 + 0 0 0 0 0 0 0
50 to 85 0 0 0 0 0 0 0
20 to 50 0 0 0 0 0 0 0
Total 0 0 0 0 0 0 0
Other softwood types
85 + 60 1,320 0 2,938 0 668 18
50 to 85 72 1,395 2 2,864 4 536 18
20 to 50 170 1,943 3 3,785 6 302 23
Total 301 4,658 1 9,587 2 431 59
Western hardwood types
85 + 285 5,817 8,288 11,537 16,536 1,236 160
50 to 85 1,656 13,776 39,411 26,723 77,982 778 584
20 to 50 2,872 15,596 63,466 30,798 125,856 666 867
Total 4,810 35,194 111,162 69,068 220,369 738 1,611
Non-stocked timberland
85 + 293 772 147 1,507 327 83 11
50 to 85 358 1,858 265 3,658 542 156 25
20 to 50 926 2,431 308 5,004 819 84 35
Total 1,576 3,721 616 7,327 1,455 74 53
All timberland
85 + 11,184 710,376 12,201 1,409,242 23,988 1,754 8,898
50 to 85 18,435 622,121 47,801 1,308,047 96,046 1,023 8,557
20 to 50 27,993 576,953 71,350 1,188,552 141,670 635 8,059
Total 57,609 1,909,451 131,347 3,905,843 261,696 975 25,482