Table 11 Verification of forest age Estimation in Xinjiang.
Forest type | Age group | Age group/a | Area/m2 | Deviation/a | |
|---|---|---|---|---|---|
Estimated value | Literature value28 | ||||
ENF | Young | 50 | 45 | 4.0 × 109 | 5 |
Middle | 76 | 85 | 5.7 × 109 | − 9 | |
Near mature | 106 | 110 | 1.6 × 109 | − 4 | |
Mature | 128 | 140 | 3.6 × 108 | − 12 | |
Overripe | 184 | 170 | 1.1 × 107 | 14 | |
DNF | Young | 22 | 35 | 9.6 × 108 | −13 |
Middle | 63 | 62.5 | 1.4 × 109 | 0.5 | |
Near mature | 91 | 82.5 | 1.2 × 109 | 8.5 | |
Mature | 112 | 105 | 1.3 × 109 | 7 | |
Overripe | 159 | 130 | 6.2 × 107 | 29 | |
DBF | Young | 4 | 5 | 2.5 × 109 | − 1 |
Middle | 13 | 12.5 | 8.9 × 108 | 0.5 | |
Near mature | 18 | 18 | 7.4 × 108 | 0 | |
Mature | 23 | 25 | 1.1 × 109 | − 2 | |
Overripe | 43 | 40 | 9.7 × 108 | 3 | |
MF | Young | 27 | 32.5 | 2.7 × 108 | − 5.5 |
Middle | 41 | 53.5 | 5.5 × 108 | − 12.5 | |
Near mature | |||||
Mature | |||||
Overripe | 124.5 | 104 | 7.6 × 107 | 24.5 | |
