Table 18C.0a. Relative standard errors (%) for annual change in total above-ground biomass on forest land by species group and age class in Canada.
Species group Age (years) Total
1-20 21-40 41-60 61-80 81-100 101-120 121-140 141-160 161-180 181-200 201+ Other1
Spruce 13.24 7.73 7.00 6.25 2.13 2.03 2.25 4.34 26.81 25.05 39.35 28.64 1.17
Pine 13.58 9.47 18.81 11.46 12.16 17.16 19.95 80.10 43.34 48.82 42.16 70.12 5.96
Unclassified 15.13 22.88 64.62 68.32 96.03 100.57 100.04 - - - - 8.74 7.81
Unspecified conifers 11.72 50.03 25.96 37.68 29.66 - - - - - - 60.41 11.39
Birch 21.17 18.25 14.51 12.89 21.24 17.78 17.20 39.93 46.58 53.12 63.42 62.51 6.74
Douglas-fir 45.01 53.86 84.23 40.97 48.32 200.0* 130.25 26.38 71.63 106.61 115.97 - 20.97
Hemlock 60.94 63.70 49.02 103.29 43.89 46.94 56.52 200.0* 65.88 168.42 63.11 - 22.53
Other hardwoods 12.41 16.79 39.18 30.68 18.50 37.25 40.93 46.22 67.70 94.33 43.11 72.68 10.53
Unspecified hardwoods 30.23 20.92 19.21 52.78 22.99 72.35 100.00 - - - - 100.51 12.75
Cedar & other conifers 59.41 28.67 40.75 32.49 53.20 48.33 50.92 44.71 75.43 81.49 48.15 - 19.81
Larch 12.93 11.64 12.63 14.35 21.29 24.86 30.64 46.76 29.55 69.81 97.96 53.14 6.98
Maple 27.35 18.48 10.92 11.25 22.54 13.88 20.69 28.94 200.0* 100.00 66.53 100.51 6.09
Poplar 11.64 12.26 7.63 5.66 6.28 12.04 16.59 18.28 36.25 53.61 47.82 74.74 3.23
Fir 19.36 10.38 10.75 13.17 11.52 21.38 21.28 23.87 31.73 147.07 27.65 45.71 5.92
Total 4.87 4.55 4.13 3.48 2.05 2.06 2.41 4.63 16.04 20.60 18.37 8.45 1.10
Source: Canada's National Forest Inventory, combined remeasured (2007-2017) and projected (2006-2017 with NFI projection system) data, where plots with strong indicators of artificial change are removed. Artificial change between successive plot measurements can be caused by using different image sources, incorporating vintage baseline inventories, and updating photo-interpretation techniques (Version 3.1, November 2025) (http://nfi.nfis.org)
Note: The Arctic ecozones (Arctic Cordillera, Northern Arctic, Southern Arctic), and the Taiga Plains and Hudson Plains ecozones located in Nunavut, are not inventoried. These non-inventoried areas total 262,189.89 thousand ha.
1 Missing or unknown age class.
* When the calculated RSE value is inflated, usually due to the associated change estimate being small (near 0), a cap of 200% is substituted for presentation purposes.