Table. 5 Potential forest area (PFA) and living-tree biomass as controlled by climate (PFAc) and relief (PFAr)
| Â | Potential forest area PFAc | Potential forest area PFAr | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Forest-size class | 1 | 2 | 3 | 4 | Steppe | 1 | 2 | 3 | 4 | Steppe |
Area (km2) | ||||||||||
 Interior | 11.49 | 69.21 | 77.30 | 2590.66 | 2692.99 | 11.17 | 69.52 | 91.04 | 2940.99 | 2308.48 |
 Edge | 35.06 | 38.45 | 23.15 | 322.99 | 38.46 | 42.14 | 28.87 | 330.62 | ||
 Ratio I/E | 0.33 | 1.80 | 3.34 | 8.02 |  | 0.29 | 1.65 | 3.15 | 8.90 |  |
Tree biomass (×106 g) |  |  |  | Total sum |  |  |  |  | Total sum | |
 Interior | 251,930 | 1,510,158 | 1,705,159 | 47,068,688 | 50,535,934 | 245,059 | 1,516,857 | 2,008,287 | 53,433,781 | 57,203,985 |
 Edge | 578,839 | 596,605 | 395,092 | 5,951,310 | 7,521,845 | 635,056 | 653,769 | 492,614 | 6,091,966 | 7,873,404 |
 Sum | 830,768 | 2,106,762 | 2100,250 | 53,019,998 | 58,057,779 | 880,115 | 2,170,625 | 2500,901 | 59,525,748 | 65,077,389 |
Comparison of tree biomasses (×106 g) | ||||||||||
 PFA - 1986 | − 483,009 | −2,031,294 | −3,537,468 | 29,243,149 | 23,191,377 | −433,662 | −1,967,431 | −3,136,817 | 35,748,898 | 30,210,988 |
 Percentage (%) | −58.1 | −96.4 | −168.4 | 55.2 | 39.9 | −49.3 | −90.6 | −125.4 | 60.1 | 46.4 |
 PFA - 2018 | −637,664 | −1,376,105 | −2,617,242 | 42,878,148 | 38,247,136 | − 588,317 | −1,312,242 | −2,216,592 | 49,383,898 | 45,266,747 |
 Percentage (%) | −76.8 | −65.3 | −124.6 | 80.9 | 65.9 | −66.8 | −60.5 | −88.6 | 83.0 | 69.6 |